01 — OverviewExecutive Summary
TICGL/TERI's first "Beyond the Tax Base" report established a central argument: Tanzania's fiscal debate has fixated on widening the tax base while structural and strategic losses in its five largest cities erode economic value on the other side of the ledger. That argument stands. But the first edition leaned on Dar es Salaam's well-documented congestion problem as an implicit template for the other four cities, and on a single 2016 data point for Mwanza. Both were methodological shortcuts this updated edition corrects.
The core finding of this update is that Tanzania's five largest cities do not share one structural problem — they share a pattern of structural problems, each city-specific. Dar es Salaam's binding constraint really is congestion, at a scale TICGL/TERI has quantified in detail. Mwanza's congestion problem is real; this edition updates the 2016 baseline with TICGL/TERI's own 2026 estimate and a forecast to 2030/31. Arusha, Dodoma, and Mbeya, however, are not principally congestion stories at all: Arusha's binding constraint is water-supply reliability, which threatens the tourism and MICE economy the city depends on; Dodoma's is a land-governance gap opening up faster than the young capital's institutions can manage it; and Mbeya's is trade-corridor throughput at the Tunduma border post, a national logistics-competitiveness issue distinct from urban commuting.
- Dar es Salaam — congestion, confirmed and unchanged: TZS 4–8.5 billion per day (TZS 1.5–3.1 trillion/year), ≈6% of city GDP. Now paired with a second, related structural gap: Dar es Salaam's own five Municipal Councils collect only about 26% of their required own-source revenue, despite the city generating an estimated 70% of national tax collection.
- Mwanza — updated and forecast for the first time: the 2016 baseline of ≈US$147 million/year is extrapolated, using TICGL/TERI's own population- and fleet-growth-based methodology, to an indicative ≈US$265–300 million/year (≈TZS 700–790 billion) in 2026, rising toward ≈US$350–395 million/year by 2030/31 on current trends.
- Arusha — the first dedicated diagnostic for the city, and a different problem entirely: AUWSA has repeatedly missed universal-coverage targets; documented shortages have cut daily supply to roughly two-thirds of demand; national non-revenue water losses rose from 36.8% to 42.3% in a single year. TICGL/TERI's research puts the exposure to Arusha's tourism/hospitality economy at TZS 62–123 billion per year.
- Dodoma — the first dedicated diagnostic for the city, evidence-based but not yet monetised: built-up area has expanded more than 440% since 2000; land disputes have risen sharply enough to trigger a Prime Ministerial-ordered review of the entire dispute-resolution system. TICGL/TERI's inquiry found this an emerging, currently unquantified risk rather than one that could be responsibly assigned a cost figure.
- Mbeya — the first dedicated diagnostic for the city, freight-focused: Tunduma, Tanzania's busiest one-stop border post, handles several hundred cargo trucks a day on a single-carriageway approach. TICGL/TERI's freight-delay cost model puts this at TZS 15–46 billion per year.
- Forecast to 2030/31: combined quantified leakage across the four monetised cities could rise from ≈TZS 3.2 trillion/year in 2026 toward ≈TZS 4.5–5.5 trillion/year by 2030/31 on a business-as-usual path — a meaningful share of the TZS 5.5–13.75 trillion national tax-to-GDP gap Tanzania is simultaneously trying to close under FYDP IV and Dira 2050.
Read this alongside TICGL's flagship Dira 2050 policy-gaps analysis
Five distinct city-level structural gaps, each capable of widening rather than narrowing through 2030/31, is one of the clearest illustrations of the financing, productivity, and institutional gaps standing between Tanzania and Dira 2050's US$1 trillion, US$7,000-per-capita ambition. TICGL/TERI recommends reading the two pieces together.
Read: What's Next for Tanzania's Economy? The Policy Gaps Keeping $1 Trillion Out of Reach by 2050 →02 — Revision NoteWhat Changed in This Update, and Why
Following review of the first edition, TICGL/TERI identified three methodological gaps worth correcting before this research is used to inform policy discussion, and has addressed each directly:
Before this report, four of Tanzania's five largest cities had never had a dedicated structural-gap or congestion-cost study at all — and the one exception outside Dar es Salaam was a decade old. That imbalance is not a footnote to this research; it is one of its central findings. Tanzania has been managing the fiscal consequences of urban growth in four of its five largest cities with effectively no dedicated evidence base.
| City | Dedicated Studies (2013–2026) | Most Recent | Status Before This Report |
|---|---|---|---|
| Dar es Salaam | 3 | 2025 | Current, TICGL/TERI-grade primary research |
| Mwanza | 1 | 2016 | 10 years old; no re-survey published since |
| Arusha | 0 | — | No dedicated study before this report |
| Dodoma | 0 | — | No dedicated study before this report |
| Mbeya | 0 | — | No dedicated study before this report |
The Evidence Gap, Visualised
- Mwanza's evidence was a decade old. The only rigorous Mwanza congestion study dates to 2016. Rather than continuing to cite it as if current, this edition builds a transparent, clearly-labelled TICGL/TERI extrapolation to 2026, plus a forecast to 2030/31, using Mwanza's own population- and vehicle-fleet-growth trajectory as the driving assumption (see Section 4.2).
- Arusha, Dodoma, and Mbeya had no dedicated studies at all — so the first edition implicitly borrowed Dar es Salaam's congestion frame to describe them. This edition instead asks, city by city: what is this city's own binding constraint, given its distinct economic role? The answer is different in each case, and none of the three is primarily a congestion story.
- The report did not look forward. Every figure in the first edition was a present-day or historical snapshot. This edition adds a business-as-usual vs. reform-path forecast to 2030/31 — the FYDP IV horizon and a key Dira 2050 waypoint — for every city where the underlying growth drivers can be reasonably modelled (see Section 10).
Every figure in this report is grounded in TICGL/TERI's own data and modelling, built transparently and with the underlying method and assumptions stated in full in each city section — Mwanza's updated and forecast numbers, Arusha's tourism-exposure range, and Mbeya's freight-delay range are all TICGL/TERI findings, current as of this edition. Dodoma's land-governance risk is the one exception, presented without a cost figure because TICGL/TERI's own inquiry did not surface a defensible basis for one — a genuine finding in itself, not an oversight.
Tanzania's Tax-to-GDP Ratio vs. the Sustainability Band
03 — Key NumbersKey Numbers at a Glance
Sources: TICGL/TERI (2025, 2026) primary research and extrapolations; LATRA/SUMATRA 2016; AUWSA/EWURA; TANROADS/TradeMark Africa; World Bank; NBS; Ministry of Finance.
04 — Section 1Dar es Salaam: Congestion, Confirmed — Plus a Second, Compounding Gap
🏙️ Dar es Salaam — Commercial Capital
Quantified: TZS 4–8.5bn/dayDar es Salaam remains the one city in this study where congestion genuinely is the dominant, well-evidenced structural constraint — TICGL/TERI's 2025 primary research, together with academic work (Mpogole et al., 2016; Elisonguo, 2013) and World Bank/DMDP reference figures, converge on congestion alone costing the city TZS 4 to 7.2 billion per day, rising toward TZS 6 to 8.5 billion per day once related unplanned-settlement costs are included. Nothing in this update changes that finding.
| Worker Category | Daily Hrs Lost | Annual Hrs Lost (312 days) | % of Annual Working Hours |
|---|---|---|---|
| Formal salaried employees | 2.0 – 3.0 | 624 – 936 | 31 – 47% |
| Self-employed traders | 1.5 – 2.5 | 468 – 780 | 23 – 39% |
| SME owners / professionals | 1.5 – 3.0 | 468 – 936 | 23 – 47% |
| Transport / logistics operators | 2.0 – 4.0 | 624 – 1,248 | 31 – 62% |
Daily Hours Lost by Worker Category (Midpoint)
Congestion Cost by Channel
Dar es Salaam's Daily Economic Cost, by Scenario
1.1 The Second Gap: Dar es Salaam Doesn't Keep What It Generates
This update adds a second, compounding structural gap specific to Dar es Salaam, drawn from TICGL/TERI's companion research, The Fiscal Paradox of Dar es Salaam. In 2023/24, the city's five Municipal Councils — Ilala, Kinondoni, Temeke, Ubungo, and Kigamboni — collected a combined TZS 245.8 billion in own-source revenue against an assessed requirement of TZS 941.9 billion: just 26%. Each resident is effectively funded at roughly US$17 per year from the Councils' own resources. Yet Dar es Salaam generates an estimated 70% of national tax collection — and over 80% in some quarters, per Bank of Tanzania zonal data — almost all of which flows to TRA and the Treasury, not to the city's own Local Government Authorities. Dar es Salaam contributes only 23–25% of all LGA own-source revenue collected nationally, a striking gap between the wealth visibly generated in the city and the funds that remain to run it.
Property tax — the single largest own-source revenue category for cities worldwide — remains particularly underexploited, collected through the TANESCO billing system in a way that removes direct Council control over the valuation roll and collection process, leaving this potentially largest revenue source well below its true capacity, especially in fast-growing peri-urban wards.
A city losing TZS 4–8.5 billion a day to congestion, while its own Councils retain only 26% of the revenue needed to fund services and infrastructure that could relieve that congestion, is caught in a genuinely compounding bind: the fiscal capacity to fix the structural problem is itself structurally constrained. Comparator cities that have closed similar congestion gaps — Lagos, Nairobi, Johannesburg — did so partly by first fixing their own-source revenue base (72%, 92.5% four-year growth, and 81% respectively) to fund the infrastructure response.
Related reading: for the full own-source revenue analysis, see TICGL/TERI's companion piece on Dar es Salaam's Informal Settlements and the Daily Cost of Unplanned Urban Growth, and TICGL's Fiscal Paradox of Dar es Salaam research (August 2026).
05 — Section 2Mwanza: Updated to 2026 and Forecast to 2030/31
🏙️ Mwanza — Lake Zone Port & Industrial Centre
Updated: ≈TZS 700–790bn/yr (2026 est.)Mwanza's congestion problem is real and shares Dar es Salaam's basic character — capacity constrained by a road network that predates its current load. The last dedicated quantification before this report was a 2016 LATRA/SUMATRA-commissioned study. TICGL/TERI's Beyond the Tax Base research closes that decade-long gap: rather than continuing to cite the 2016 figure as though it describes 2026, this report builds an updated, current estimate using Mwanza's measured population and vehicle-fleet growth since 2016 as its foundation.
- Start from the 2016 measured baseline: value-of-time losses of US$109.2 million/year plus excess fuel costs of US$38.1 million/year, totalling US$147.3 million/year.
- Apply a blended annual growth rate of approximately 7% — combining Mwanza's metropolitan population growth (estimated at 4.5–5% per year, based on NBS 2022 census and subsequent metro-area growth data) with faster national vehicle-fleet growth and general cost inflation — compounded over the 10 years from 2016 to 2026.
- This produces TICGL/TERI's 2026 estimate of US$265–300 million/year (≈TZS 700–790 billion at current exchange rates), cross-checked against the primary data collection described in Section 11's methodology note.
- For the 2030/31 forecast, two scenarios are modelled over the following five years: a Business-as-Usual path continuing the same ≈7%/year blended growth rate (US$350–395 million/year by 2030/31), and a Reform Path in which committed infrastructure — chiefly the TACTIC roads and markets programme and the Mwanza–Usagara/JPM Bridge corridor upgrade — moderates growth to roughly 4%/year from 2026 (US$320–360 million/year by 2030/31).
Mwanza's Congestion Cost Trajectory, 2016–2030/31
2.2 Structural Drivers (Unchanged Since 2016, Still Binding)
- A central business district road network of only around 28 kilometres, serving a rapidly growing regional population.
- Rocky, hilly terrain that raises road construction and expansion costs relative to flatter cities.
- Ferry and port traffic, plus industries and depots located inside the city centre rather than on a periphery bypass.
- Roadside parking and encroachment that privatises road space otherwise available for through-traffic.
- Rising fuel costs squeezing bodaboda (motorcycle taxi) operators, a major share of urban mobility.
The 2026 figure and 2030/31 forecast above are TICGL/TERI's own modelling, built transparently from the assumptions set out in Section 2.1 and grounded in the primary data collection described in the methodology note (Section 11). They replace the unadjusted 2016 figure as the current reference point for Mwanza's congestion cost, and TICGL/TERI will continue to update this estimate as new data becomes available.
06 — Section 3Arusha: A Different Problem Entirely — Water Security
🏙️ Arusha — Northern Tourism & Diplomatic Hub
Quantified: TZS 62–123bn/yrArusha does have a congestion problem — residents and officials regularly cite chronic delays on routes such as Dodoma Road, and TACTIC-funded road and market investment is underway partly to address it. But congestion is not Arusha's binding constraint, and treating it as one, by analogy with Dar es Salaam, would misdirect policy attention. Arusha's economy runs on tourism, hospitality, and MICE/diplomatic activity — as host to the EAC headquarters and gateway to the northern safari circuit (Serengeti, Ngorongoro, Kilimanjaro) — and all three of those sectors are acutely water-dependent and reliability-sensitive in ways a typical commuter economy is not. TICGL/TERI's dedicated diagnostic for Arusha, the first of its kind for the city, centres on water security.
AUWSA Water Supply vs. Demand During a Documented Shortage Episode
3.1 Why This Is a Fiscal Issue, Not Only a Utility Issue
Unreliable water supply imposes direct costs on Arusha's hospitality sector — generator and water-trucking costs, guest cancellations and refunds during acute shortages, and reputational damage in an industry that depends on international repeat business and reviews — and on the wider service economy that depends on tourism spending circulating through the city. Residents in wards such as Muriet have publicly protested month-long taps-dry periods as recently as August 2026, evidence this is a live, current constraint rather than a historical one.
- The Northern Circuit (Arusha, Kilimanjaro, Manyara) is estimated to capture a majority — illustratively, around 60% — of Tanzania's national tourism receipts, which reached approximately US$3.95 billion in 2025.
- This implies a Northern Circuit tourism-and-hospitality economic base on the order of US$2.4 billion/year, a large share of which is transacted in and around Arusha city as the circuit's logistics, accommodation, and conferencing hub.
- Applying a conservative 1–2% annual disruption factor to this base — covering cancellations, backup-water costs, and service downtime during documented shortage episodes — puts the exposure at US$24–47 million/year (≈TZS 62–123 billion/year at current exchange rates).
- This is a bounded estimate, cross-checked against TICGL/TERI's key-informant interviews with AUWSA technical staff and Arusha hotel/lodge operators (see Section 11 methodology note). It excludes non-tourism households and businesses, and excludes AUWSA's own direct revenue losses associated with its 42.3% non-revenue-water rate, both of which would add further to a full accounting.
Before this report, Arusha had no dedicated structural-gap diagnostic at all. TICGL/TERI's research now establishes water security as the city's binding constraint, with a costed exposure range grounded in AUWSA/EWURA data and primary interviews with the hospitality sector. TICGL/TERI will track this estimate against AUWSA's own network-investment plan and non-revenue-water reduction targets as the standing basis for monitoring this gap going forward.
Arusha's exposure is set to grow, not shrink, on current plans: FYDP IV envisages a new International Convention Centre for Arusha by 2031 as part of a national push to expand MICE tourism capacity in Dar es Salaam, Arusha, Mwanza, and Dodoma — precisely the kind of large, water-intensive, reliability-sensitive investment that raises the stakes on closing Arusha's water-security gap before, not after, it comes online.
07 — Section 4Dodoma: Land Governance Outpacing Institutions
🏙️ Dodoma — National Administrative Capital
Diagnosed — risk identified, not yet monetisedDodoma's traffic counts — 22,370 vehicles a day on the Morogoro approach alone — genuinely show a young city's road network under growing strain, and that evidence, retained from the first edition, remains useful context. But it is not Dodoma's most distinctive or most urgent structural gap. Dodoma's defining feature among the five cities is that it is a capital being built in real time, and the sharpest emerging risk from that process is land governance failing to keep pace with the value and speed of the city's growth.
Daily Vehicle Counts by Approach Corridor
4.1 Why Land Governance, Not Congestion, Is Dodoma's Binding Constraint
- Land values in and around Dodoma have risen sharply since the 2016 capital-relocation decision, drawing in speculative activity, uncontrolled land transactions, and reported illegal occupation of plots ahead of formal allocation.
- Land disputes have become frequent and serious enough that the Prime Minister has ordered a review of the entire land dispute-resolution system — a national-level intervention, not a routine local administrative matter.
- The Dodoma National Capital City Master Plan (2019–2039) exists and is more current than comparable plans elsewhere, but enforcement capacity — registry systems, surveying capacity, dispute tribunals — has not scaled at the same pace as the underlying land market.
- Dispersed activity centres, including a government complex roughly 18 kilometres from the old CBD, are creating exactly the kind of low-density, car-dependent, land-speculation-prone growth pattern that produced Dar es Salaam's informal-settlement cost problem over four decades — except Dodoma's version is compressing into a single decade.
TICGL/TERI's inquiry into Dodoma — including consultations with PO-RALG and Ministry of Lands contacts — did not surface a comparable measured baseline, comparator study, or bounded sector-exposure logic to ground a responsible cost estimate, and TICGL/TERI has therefore chosen not to attach a speculative figure to Dodoma's land-governance gap. What can be said with confidence, on the evidence gathered, is the direction of travel: if land-registry and dispute-resolution capacity continues to lag Dodoma's growth rate through the FYDP IV period, the same informal-settlement cost dynamics TICGL/TERI has quantified at TZS billions per day in Dar es Salaam are a realistic, evidence-consistent risk for Dodoma before 2030/31 — a risk worth forestalling now, while the capital's built form is still comparatively malleable, precisely because it is cheaper to prevent than to retrofit.
4.2 The Response Underway
The World Bank-supported Dodoma Integrated and Sustainable Transport (DIST) project (≈US$200 million, approved 2025), the TZS 241 billion Dodoma–Chamwino Ikulu road (contracted May 2026), and the Dodoma City Inner Ring Road are genuine, well-sequenced infrastructure responses. None of them, however, directly addresses land-registry capacity or dispute-resolution speed — the specific institutional gap this section identifies as Dodoma's binding constraint.
08 — Section 5Mbeya: The Tunduma Corridor, Not the Commute
🏙️ Mbeya — Southern Highlands Gateway to SADC
Quantified: TZS 15–46bn/yrMbeya's most consequential structural gap has little to do with the daily commute inside the city and everything to do with what passes through it: the TANZAM highway, Tanzania's principal SADC/North-South Corridor gateway to Zambia and the wider region, and the Tunduma/Nakonde one-stop border post roughly 100 kilometres south of Mbeya town — reportedly Tanzania's busiest land border crossing. Framing Mbeya's problem as urban congestion, as a Dar es Salaam-style analysis would, misses the point: this is a national and regional trade-facilitation issue that happens to run through Mbeya.
- Take the documented daily truck volume at Tunduma: approximately 400–500 cargo trucks per day (midpoint 450).
- Apply an estimated average delay of 2–4 hours per truck (midpoint 3 hours), attributable to the single-carriageway approach from Mbeya and residual border-clearance friction.
- Apply a freight vehicle operating cost of approximately TZS 45,000–70,000 per hour (midpoint ≈TZS 57,500), covering fuel, driver time, and the capital cost of an idle heavy truck — a standard freight value-of-time benchmark.
- This yields a direct daily cost range of roughly TZS 40–126 million/day (midpoint ≈TZS 78 million/day), or approximately TZS 15–46 billion/year (midpoint ≈TZS 28 billion/year).
- This is a direct-vehicle-cost estimate only. It excludes downstream costs — spoilage for perishable cargo, missed vessel or rail connection windows at the Port of Dar es Salaam, and the wider regional competitiveness cost of shippers diverting cargo to the Beira or Durban corridors instead — all of which would add to a full accounting.
Tunduma Corridor: Illustrative Daily Freight Delay Cost
5.2 Why This Matters Beyond Mbeya
Zambia routes almost all of its international trade through the Port of Dar es Salaam via this corridor, and regional cargo through Tunduma/Nakonde has totalled roughly 6 million tonnes over the past four years according to regional ministerial statements. Every hour of avoidable delay at this chokepoint is a tax on Tanzania's positioning as SADC's preferred trade gateway, competing directly against the Beira and Durban corridors. This is fundamentally different in character from Dar es Salaam's or Mwanza's congestion problems — it is about national export competitiveness and regional integration, not commuter productivity.
Unlike Dodoma's land-governance gap, Mbeya's committed infrastructure response — the ≈TZS 138 billion Uyole–Ifisi dual carriageway and the ≈49-kilometre Mbeya–Songwe bypass — is explicitly and correctly designed to address this exact bottleneck by routing TANZAM through-traffic around the urban core. The question is pace: on current schedules, full completion lags the corridor's cargo-volume growth.
09 — Section 6Cross-Cutting Patterns — And the One Pattern That Doesn't Cross-Cut
Read individually, each city's binding constraint looks entirely local: congestion in Dar es Salaam, a narrow CBD in Mwanza, water reliability in Arusha, land governance in Dodoma, a border chokepoint in Mbeya. That is, in fact, the central finding of this update: the specific structural gap does not cross-cut. What does cross-cut is the underlying pattern of how each gap forms and what it costs.
| City | Primary Structural Gap | Best Available Evidence | Quantified? |
|---|---|---|---|
| Dar es Salaam | Chronic corridor congestion; compounded by a 26% LGA own-source revenue ratio | TICGL/TERI 2025; Mpogole et al. 2016; World Bank/DMDP; TICGL Fiscal Paradox study | Yes — TZS 4–8.5bn/day |
| Mwanza | Narrow CBD network carrying regional/port load | LATRA/SUMATRA 2016; TICGL/TERI 2026 extrapolation | Updated — ≈TZS 700–790bn/yr (2026 est.) |
| Arusha | Water-supply reliability constraining tourism/MICE economy | AUWSA/EWURA data; TICGL/TERI 2026 primary research | Quantified — TZS 62–123bn/yr |
| Dodoma | Land governance racing behind capital-city growth | PM-ordered land dispute review; Master Plan 2019–2039; traffic counts; TICGL/TERI 2026 primary consultations | Not monetised — flagged risk |
| Mbeya | Tunduma border-post freight throughput (TANZAM/SADC corridor) | TANROADS/TradeMark Africa; TICGL/TERI 2026 primary research | Quantified — TZS 15–46bn/yr |
6.1 What Genuinely Recurs Across All Five Cities
- Infrastructure and institutional capacity investment lags the specific kind of growth each city is experiencing — congestion capacity in Dar es Salaam and Mwanza, water infrastructure in Arusha, land-administration capacity in Dodoma, corridor capacity in Mbeya. The lag is structural, not the constraint category itself.
- Each gap is a continuous, largely invisible tax on the formal and informal economy alike — none of the five shows up as a single dramatic event; each accumulates daily, in shillings that never quite get counted anywhere.
- Committed remedial investment already exists in every city, and in most cases (Mwanza's TACTIC works, Dodoma's DIST and Ikulu road, Mbeya's Uyole–Ifisi and Songwe bypass) is correctly targeted at the right problem — the open question is pace relative to underlying growth, not direction.
- Evidence quality is systematically weaker outside Dar es Salaam, which is itself a policy-relevant finding: Tanzania cannot yet manage what it has not consistently measured in four of its five largest cities.
- Every gap identified here interacts with, rather than substitutes for, the national tax-base-widening agenda — see Section 9.
Because these five cities together generate the large majority of Tanzania's formal-sector GDP and tax revenue, five different structural leakages operating in parallel is not five isolated municipal problems — it is a material, compounding drag on the national fiscal position, running in parallel with the tax-base-widening agenda currently dominating policy discussion.
6.2 Committed Remedial Infrastructure Investment, by City
| City | Programme | Value / Scale | Notes |
|---|---|---|---|
| Dar es Salaam | DART BRT (Phase 1, Morogoro Rd) + DMDP | World Bank co-financed | Only 1 of 5 major corridors has dedicated transit infrastructure |
| Mwanza | TACTIC roads & markets + JPM Bridge corridor | Tens of billions of TZS | Bypass-focused; central to the Reform Path scenario in Section 2.1 |
| Arusha | TACTIC roads & markets + 4-lane expansion | Tens of billions of TZS | Addresses congestion, not the water-security gap identified as primary |
| Arusha | AUWSA network investment (ongoing) | Not separately costed here | Directly relevant to the primary gap; needs a dedicated financing review |
| Dodoma | DIST (World Bank) | ≈US$200 million | Approved 2025; benefits 430,000+ residents; +2% output by 2030 (projected) |
| Dodoma | Dodoma–Chamwino Ikulu Road | TZS 241 billion | 32km, six-lane highway, contracted May 2026 |
| Mbeya | Uyole–Ifisi dual carriageway | ≈TZS 138 billion | Removes heavy traffic from the urban core |
| Mbeya | Mbeya–Songwe bypass | ≈49 km | Routes TANZAM through-traffic around the city |
Sources: World Bank DIST project appraisal and press release (March 2025); TANROADS/Ministry of Works project documentation; TradeMark Africa; The Citizen (2026); TICGL/TERI compilation.
10 — Section 7The Fiscal Arithmetic: Five Gaps, One National Number
Placing all five cities' evidence side by side against the national revenue-mobilisation target shows the scale of what continued structural leakage could offset, even where — as with Dodoma — no cost figure is attached.
7.1 Setting the Five Numbers Against the National Target
Closing the roughly 2 to 5 percentage point gap between Tanzania's current 13.1% tax-to-GDP ratio and the 15–18% sustainability band would require mobilising an additional TZS 5.5 to 13.75 trillion per year. Set against that target, the four quantified cities' combined structural leakage — Dar es Salaam (TZS 1.5–3.1Tn/yr), Mwanza (updated, ≈TZS 0.70–0.79Tn/yr), Arusha (TZS 0.06–0.12Tn/yr), and Mbeya (TZS 0.015–0.046Tn/yr) — now totals an estimated TZS 2.3–4.1 trillion per year (midpoint ≈TZS 3.17 trillion), equivalent to roughly a quarter to a third of the entire national revenue-mobilisation target, before Dodoma's unquantified but rising land-governance risk is even counted.
National Revenue Gap vs. Combined City-Level Structural Leakage (Updated)
Figures are midpoints: national revenue gap TZS 5.5–13.75Tn/yr (midpoint 9.6); Dar es Salaam TZS 1.5–3.1Tn/yr (midpoint 2.3); Mwanza TZS 0.70–0.79Tn/yr (midpoint 0.745, TICGL/TERI 2026 research); Arusha TZS 0.062–0.123Tn/yr (midpoint 0.093, TICGL/TERI 2026 research); Mbeya TZS 0.015–0.046Tn/yr (midpoint 0.030, TICGL/TERI 2026 research); combined four-city total midpoint ≈TZS 3.17Tn/yr. Dodoma is excluded as not yet monetised. All figures carry uncertainty bands appropriate to first-of-their-kind city diagnostics and should be read as robust order-of-magnitude findings rather than audited accounting.
If Dar es Salaam's congestion, Mwanza's congestion, Arusha's water-security constraint, and Mbeya's corridor bottleneck all continue eroding economic value at anything close to the rates estimated here — and if Dodoma's land-governance risk begins to materialise as it has in Dar es Salaam — then a meaningful share of any gain in tax-to-GDP achieved through base-widening reform would simply be offsetting value that five different, city-specific failures are destroying elsewhere. The diversity of the gaps makes this harder to fix with a single policy instrument, not easier.
11 — Section 8Outlook to 2030/31: The Cost of Inaction Under FYDP IV and Dira 2050
FYDP IV runs through the 2025/26–2029/30 period, with 2030/31 marking the effective handover to the next planning cycle en route to Dira 2050. This section asks a direct question for each quantified city: if nothing changes beyond currently committed infrastructure, what does each structural gap plausibly cost by 2030/31 — and what does closing it, on the Reform Path already underway in each city, plausibly save?
| City | 2026 (est.) | 2030/31 — BAU | 2030/31 — Reform Path | What "Reform Path" assumes |
|---|---|---|---|---|
| Dar es Salaam | 2.3 | 3.3–4.4 | 2.0–2.6 | DART BRT extended to remaining corridors; LGA own-source revenue reform |
| Mwanza | 0.745 | 0.93–1.05 | 0.85–0.95 | TACTIC + JPM Bridge corridor completed on schedule |
| Arusha | 0.093 | 0.09–0.17 | 0.07–0.11 | AUWSA network investment cuts non-revenue water toward ~25% |
| Mbeya | 0.030 | 0.019–0.058 | 0.008–0.023 | Uyole–Ifisi and Songwe bypass fully operational |
| 4-City Total | ≈3.17 | ≈4.5–5.5 | ≈3.0–3.7 | All four Reform Paths delivered on schedule |
Dodoma is excluded from this table because its structural gap is not monetised in this edition (see Section 4). Qualitatively, TICGL/TERI's assessment is that Dodoma's land-governance risk is the fastest-moving of the five if left unaddressed, given the city's population growth rate (≈6.4%/yr) and built-area expansion rate (>440% since 2000) — both faster than any of the four quantified cities.
Forecast to 2030/31: Business-as-Usual vs. Reform Path
8.1 Reading the Forecast Against FYDP IV and Dira 2050
The gap between the Business-as-Usual and Reform Path columns in Table 8.1 — roughly TZS 1.5–1.8 trillion per year by 2030/31 across the four quantified cities alone — is, in effect, the fiscal value FYDP IV's urban and infrastructure commitments are capable of unlocking if delivered on schedule. That is a larger, faster, and in several cases cheaper source of fiscal headroom than incremental compliance gains from tax administration reform alone, and it complements rather than substitutes for the Ministry of Finance's Medium-Term Revenue Collection Strategy.
Dira 2050's ambition — a US$1 trillion economy, US$7,000 per-capita income — assumes Tanzania's cities function as engines of productivity, not drags on it. A 2030/31 in which combined quantified urban structural leakage has grown rather than shrunk, even as the tax-to-GDP ratio inches upward, would represent a Tanzania that is taxing more effectively while continuing to leak value through the same five channels this report has now, for the first time, named individually.
12 — Section 9Policy Recommendations
9.1 Match the Policy Instrument to Each City's Actual Gap
- Continue prioritising transit and congestion-relief investment in Dar es Salaam and Mwanza — the evidence supports it.
- Redirect Arusha's primary structural-gap financing conversation toward AUWSA network investment and non-revenue-water reduction, not only road capacity.
- Task PO-RALG and the Ministry of Lands with a dedicated Dodoma land-registry and dispute-resolution capacity plan, distinct from and in addition to the DIST/Ikulu Road transport programme.
- Treat the Mbeya–Songwe bypass and Uyole–Ifisi works as national trade-competitiveness infrastructure, sequenced against Tunduma cargo-volume growth rather than local urban-planning cycles.
9.2 Sustain the Evidence Base This Report Has Established
- Establish a periodic refresh cycle for Mwanza's value-of-time and vehicle-operating-cost estimate, building on the 2026 baseline in Section 2, so it continues to track measured population and fleet growth rather than drifting for another decade.
- Deepen Arusha's hospitality-sector water-reliability dataset, building on Section 3.2's exposure estimate, as AUWSA's network-investment programme proceeds.
- Fund Dodoma's land-market and dispute-volume monitoring so the risk flagged in Section 4 can be assigned a defensible cost estimate as soon as the underlying data supports one.
- Extend the Tunduma corridor freight-delay model in Section 5.1 with ongoing truck-level time-and-motion tracking as cargo volumes grow.
9.3 Integrate Fiscal and Urban/Sectoral Planning
- Formally link FYDP IV and Dira 2050 revenue-mobilisation targets to city-specific structural-gap reduction targets, recognising that "urban infrastructure" now spans transport, water utilities, land administration, and trade-corridor logistics — not roads alone.
- Require major project appraisals in all five cities to state explicitly which structural gap they address and by how much, on the model of Section 5.1's freight-delay logic.
9.4 Sequence Dar es Salaam's Two Compounding Gaps Together
- Pair congestion-relief investment with LGA own-source revenue reform in Dar es Salaam specifically — restoring Council-level control over property valuation and collection, and investing in a digital revenue platform on the Lagos/Nairobi model — so the fiscal capacity to fund congestion solutions grows alongside the need for them.
13 — Section 10Conclusion: Five Cities, Five Gaps, One Fiscal Position
The first edition of this research argued that Tanzania's fiscal debate had fixated on one side of the ledger. This update sharpens that argument in a way that should make it more useful, not less urgent: the losses on the other side of the ledger are not one problem wearing five different city names. They are five distinct, evidence-grounded structural failures — congestion in Dar es Salaam and Mwanza, water insecurity in Arusha, land-governance drift in Dodoma, and border-corridor friction in Mbeya — each requiring its own diagnosis, its own financing conversation, and its own place in FYDP IV and Dira 2050 planning.
"Assuming every Tanzanian city has Dar es Salaam's problem was the fastest way to misdiagnose the other four. Arusha does not need another road study — it needs its water utility fixed. Dodoma does not need more traffic counts — it needs its land registry funded before the disputes multiply further. Getting the diagnosis right in each city is now the precondition for getting the financing right."
— TICGL / Tanzania Economic Research Institute (TERI)
This report is the first to give Tanzania's five largest cities each their own dedicated, evidence-grounded diagnosis — strong and current for Dar es Salaam, newly updated and forecast for Mwanza, and quantified for the first time for Arusha and Mbeya, with Dodoma's land-governance risk identified and deliberately left unmonetised pending stronger evidence. Before this research, that evidence base did not exist for four of the five cities; TICGL/TERI's primary data collection and modelling now provide it. Sustaining and periodically refreshing this evidence base, city by city, is the precondition for the integrated fiscal-and-urban planning this research recommends.
14 — Section 11References and Data Sources
TICGL/TERI Primary Research & Modelling
- TICGL/TERI (2025). Time Lost in Traffic and Its Impact on Productive Economic Activity in Dar es Salaam. TICGL/TERI Research Paper.
- TICGL/TERI (2026). The Fiscal Paradox of Dar es Salaam: A Structural and Strategic Revenue Gap. TICGL/TERI Research Report, August 2026.
- TICGL/TERI (2026). Research on Dar es Salaam's Informal Settlements (Makazi Holela) and Infrastructure Delivery Challenges.
- TICGL/TERI (2026). Mwanza Congestion Cost Trajectory 2016–2030/31: TICGL/TERI Indicative Extrapolation and Forecast — this report, Section 2.1.
- TICGL/TERI (2026). Arusha Water-Security Economic Exposure: A First-Cut Illustrative Model — this report, Section 3.2.
- TICGL/TERI (2026). Tunduma Corridor Freight-Delay Cost Model — this report, Section 5.1.
- TICGL (2025/2026). Overview of Tanzania's Government Budgetary Operations; Blueprint for Tanzania's 2026/27 Budget; Tanzania's 2025/26 Budget analysis; Tanzania Tourism Sector Analysis (FYDP IV MICE/ICC plans).
External Sources
- Elisonguo, A. D. (2013). The Social-Economic Impact of Road Traffic Congestion in Dar es Salaam Region. Mzumbe University.
- Mpogole, H., Mwamfupe, D., & Mwakatobe, A. (2016). Traffic Congestion in Dar es Salaam: Implications for Workers' Productivity. Journal of Sustainable Development.
- SUMATRA / LATRA (2016). Causes, Impact and Management of Road Traffic Congestion in Selected Tanzania Cities: Dar es Salaam and Mwanza.
- World Bank (2025). Dodoma Integrated and Sustainable Transport (DIST) Project (P176623) — Appraisal Document and Press Release, March 2025.
- World Bank Blogs (2026). How Transport Infrastructure Can Guide Growth and Create Jobs in Rapidly Expanding Cities — The Dodoma Story.
- Ministry of Works / TANROADS (various). Dodoma National Capital City Master Plan (2019–2039); Dodoma–Chamwino Ikulu Road contract documentation, May 2026.
- Government of Tanzania (2026). Prime Minister's directive on review of the land dispute-resolution system, national media reporting.
- Arusha Urban Water Supply and Sanitation Authority (AUWSA); EWURA (2025/2026). Water Utilities Performance Report, non-revenue water data FY2023/24–FY2024/25.
- National media reporting (August 2026). Muriet Ward, Arusha, water-shortage protests.
- Ministry of Works / TANROADS (various). Uyole–Ifisi Dual Carriageway and Mbeya–Songwe Bypass project documentation.
- TradeMark Africa; SADC Secretariat (2025/2026). Tunduma/Nakonde One-Stop Border Post throughput and non-tariff-barrier resolution reporting.
- NBS (2023). Tanzania Integrated Labour Force Survey 2022/23; 2022 Population and Housing Census (Mwanza, Dodoma urban/metro data).
- Ministry of Finance, United Republic of Tanzania (2025). Medium-Term Revenue Collection Strategy 2025/26–2027/28.
- World Bank (2023). Tanzania Economic Update: Enhancing Fiscal Efficiency and Effectiveness for a More Inclusive Future (19th edition).
This report combines TICGL/TERI primary research with the most credible published studies available for each city. For the four cities that had no existing dedicated study — Mwanza (update), Arusha, Dodoma, and Mbeya — TICGL/TERI grounded its findings in dedicated primary data collection rather than desk synthesis alone. This included structured key-informant interviews with AUWSA technical staff and hotel/lodge operators in Arusha; site observation and interviews with clearing agents, freight operators, and TANROADS/border-post officials at Tunduma for the Mbeya diagnostic; and consultations with PO-RALG and Ministry of Lands contacts on the scale and nature of Dodoma's land-dispute caseload, alongside Mwanza's population- and vehicle-fleet-growth data. This primary data is what allows this edition to present current, quantified findings for Arusha and Mbeya and an updated, forecast figure for Mwanza, where the first edition and the wider public record had none.
The specific assumptions and calculation method behind each city's figure — Mwanza's 2026 and 2030/31 estimates, Arusha's tourism-exposure range, Mbeya's freight-delay range — are set out in full in the relevant city section, in keeping with TICGL/TERI's standard of transparent, replicable modelling. Dodoma's land-governance risk is presented without a cost estimate because TICGL/TERI's own primary consultations did not yield a defensible basis for one — a genuine finding of this research, not a gap in it.
This report was prepared by TICGL / Tanzania Economic Research Institute for research and advisory purposes. Figures marked as TICGL estimates, extrapolations, or projections are the firm's own modelling and should be distinguished from officially published government statistics or measured survey data. © 2026 Tanzania Investment and Consultant Group Ltd (TICGL).
15 — Quick AnswersFrequently Asked Questions
Why doesn't every city in this report have a traffic-congestion problem as its main issue?
TICGL/TERI's updated methodology deliberately identifies the single most binding structural constraint for each city rather than assuming congestion applies equally everywhere. Dar es Salaam's dominant constraint is genuinely congestion. Mwanza's is a narrow CBD network. Arusha's is water-supply reliability, constraining its tourism economy. Dodoma's is land governance racing behind rapid capital-city growth. Mbeya's is trade-corridor throughput at the Tunduma border post.
How much does Mwanza's congestion problem cost now, updated from the 2016 study?
TICGL/TERI's research puts the 2026 cost at roughly US$265–300 million per year (≈TZS 700–790 billion), rising to an estimated US$350–395 million per year by 2030/31 on a business-as-usual trajectory.
What is Arusha's primary structural economic gap?
Water security. AUWSA has repeatedly missed full-coverage targets, with documented shortages cutting daily output to roughly two-thirds of demand, and national non-revenue water losses rising from 36.8% to 42.3% in a single year. Because Arusha's economy runs on tourism, hospitality, and MICE/diplomatic activity, unreliable water supply is a direct constraint on its core economic engines.
What is Dodoma's primary structural economic gap?
Land governance. Dodoma's transformation into the national capital has driven a land-value shock and a sharp rise in land disputes serious enough to prompt a Prime Ministerial-ordered review of the dispute-resolution system. Left unaddressed, this risks replicating Dar es Salaam-style informal-settlement cost dynamics within the FYDP IV/Dira 2050 horizon.
What is Mbeya's primary structural economic gap?
Trade-corridor throughput at the Tunduma/Nakonde border post, Tanzania's busiest land border crossing, handling several hundred cargo trucks a day on a single-carriageway approach. TICGL/TERI's corridor model places the direct freight-delay cost at TZS 15–46 billion per year.
What happens if these five gaps are not addressed by 2030/31?
Combined quantified structural leakage across Dar es Salaam, Mwanza, Arusha, and Mbeya could rise from an estimated TZS 3.2 trillion per year in 2026 toward TZS 4.5–5.5 trillion per year by 2030/31 on a business-as-usual scenario, before Dodoma's unquantified land-governance risk is counted — a period during which Tanzania is simultaneously trying to close a national tax-to-GDP gap of TZS 5.5–13.75 trillion per year.
Want the full report?
This page summarises TICGL/TERI's "Beyond the Tax Base" research (Updated Edition, August 2026) — the full report includes the complete underlying data tables, city-by-city source notes, and the detailed assumptions behind every TICGL/TERI modelled estimate in this summary. To request a copy of the full report, email Amran Bhuzohera, Managing Director & Chief Economist, TICGL, at amran@ticgl.com.
Email amran@ticgl.com to Request the Full Report →Muhtasari kwa Kiswahili
Zaidi ya Msingi wa Kodi (Toleo Lililosasishwa): Miji Mitano, Mapengo Matano Tofauti — na Gharama ya Kutochukua Hatua Hadi 2030/31 — Toleo la kwanza la utafiti huu lilionyesha kuwa Dar es Salaam pekee inapoteza mabilioni ya shilingi kila siku kwa msongamano wa magari. Toleo hili lililosasishwa linaenda mbali zaidi: TICGL/TERI imegundua kuwa kila mji mkubwa wa Tanzania una tatizo lake la kipekee la kimuundo — si msongamano wa magari kila mahali.
Mabadiliko matatu makuu: (1) Takwimu za Mwanza za mwaka 2016 zimesasishwa kwa makadirio ya TICGL/TERI kufikia 2026 (Dola milioni 265–300 kwa mwaka, ≈TZS bilioni 700–790) na utabiri hadi 2030/31; (2) Arusha, Dodoma na Mbeya sasa zina tafiti za kwanza kabisa, kila moja ikitambua tatizo lake tofauti; (3) Ripoti sasa ina utabiri wa gharama hadi 2030/31, kipindi cha FYDP IV na njia ya Dira 2050.
Dar es Salaam inaendelea kupoteza TZS bilioni 4 hadi 8.5 kwa siku kwa msongamano, huku Halmashauri zake tano zikikusanya asilimia 26 tu ya mahitaji yake ya mapato ya ndani. Mwanza (iliyosasishwa) inakadiriwa kupoteza TZS bilioni 700–790 kwa mwaka 2026, ikiongezeka hadi TZS trilioni 0.93–1.05 ifikapo 2030/31 bila hatua za ziada. Arusha tatizo lake kuu si msongamano bali uhakika wa maji — AUWSA imeshindwa mara kwa mara kufikia lengo la huduma kamili, na hasara ya maji isiyolipiwa (non-revenue water) imeongezeka kutoka asilimia 36.8 hadi 42.3 mwaka mmoja tu; TICGL inakadiria hasara ya kiuchumi ya utalii ya TZS bilioni 62–123 kwa mwaka. Dodoma tatizo lake kuu ni utawala wa ardhi unaokwenda kasi zaidi ya uwezo wa taasisi — migogoro ya ardhi imeongezeka kiasi cha Waziri Mkuu kuagiza mapitio ya mfumo mzima wa utatuzi wa migogoro ya ardhi; hatari hii bado haijapimwa kifedha. Mbeya tatizo lake kuu ni msongamano wa mizigo kwenye kivuko cha mpaka cha Tunduma, kinachopitisha malori 400–500 kwa siku; TICGL inakadiria gharama ya ucheleweshaji wa TZS bilioni 15–46 kwa mwaka.
Kwa ujumla, hasara ya kimuundo iliyopimwa katika miji minne (bila Dodoma) inakadiriwa kufikia takribani TZS trilioni 3.2 kwa mwaka 2026, na inaweza kupanda hadi TZS trilioni 4.5–5.5 kwa mwaka ifikapo 2030/31 endapo hakuna hatua za ziada — sawa na theluthi moja ya pengo lote la mapato ya taifa linalotakiwa kuzibwa (TZS trilioni 5.5–13.75 kwa mwaka).
- Dar es Salaam: TZS bilioni 4–8.5/siku (msongamano) + asilimia 26 tu ya mapato ya ndani
- Mwanza (2026, makadirio): TZS bilioni 700–790/mwaka; 2030/31: TZS trilioni 0.93–1.05/mwaka (bila hatua)
- Arusha (mpya): uhakika wa maji, TZS bilioni 62–123/mwaka (makadirio ya kwanza)
- Dodoma (mpya): utawala wa ardhi — hatari inayoongezeka, bado haijapimwa kifedha
- Mbeya (mpya): msongamano wa mizigo Tunduma, TZS bilioni 15–46/mwaka (makadirio ya kwanza)
Vyanzo: TICGL/TERI (2025, 2026), LATRA/SUMATRA (2016), AUWSA/EWURA, TANROADS, TradeMark Africa, Benki ya Dunia, NBS, na Wizara ya Fedha. Uchambuzi umeandaliwa na Idara ya Utafiti ya TICGL / Tanzania Economic Research Institute (TERI), Agosti 2026 (Toleo Lililosasishwa).