This is the most common objection — and the most consistently disproved by evidence. Ireland reduced its CIT from 32% to 12.5% and saw corporate tax revenue increase dramatically because the tax base expanded through FDI inflows. Rwanda's preferential 15% CIT rate has expanded revenues — not reduced them. A lower rate on a broader, growing base generates more revenue than a higher rate on a narrow, shrinking base. Tanzania's TRA has already demonstrated this: exceeding collection targets by 103% while the formal tax base remains narrow. The risk of lowering rates is far smaller than the cost of keeping them high and watching investment flow to competitors.

Tanzania's fiscal challenge is real: a 13.1% tax-to-GDP ratio does constrain public service delivery. But the solution is not to raise rates — it is to grow the base. Tanzania's nominal GDP is estimated at TZS 275 trillion in 2026. Every 1 percentage point increase in the tax-to-GDP ratio equals TZS 2.75 trillion in revenue. The fastest path to that additional revenue is enabling enough private sector growth that the formal economy doubles in size — which at the current 13.1% rate would nearly double revenue. Vietnam grew its revenue base not by raising rates but by presiding over two decades of 6–7% private sector-led GDP growth.

Tanzania's FDI performance has improved significantly — the 400%+ surge in 2024 is genuinely impressive. But context matters: that surge was driven primarily by enabling reforms (TISEZA, Investment Act 2022, land lease policy) — not by the tax regime. Private sector credit remains at only 16.4% of GDP, manufacturing has been stagnant at ~8% of GDP for three decades, and the informal sector dominates employment without contributing to the tax base. The FDI surge proves the enabler model works — it is an argument for doing more of it, not for reversing course with tax increases.

Rwanda — one of the region's strongest private-sector enablers — has also achieved significant poverty reduction and improved HDI scores over the same period. Private sector-led growth creates formal employment, which is the most powerful and sustainable poverty reduction mechanism. Tanzania's poverty rate actually increased during COVID (from 26.1% to 27.7%) — a period of economic slowdown. When the private sector grows, it creates jobs, raises wages, broadens the tax base, and generates fiscal revenues that fund social services. Tax equity is best achieved through progressive consumption taxes and personal income taxes — not punitive corporate rates that reduce investment and employment.

This objection is addressed by the African comparators in this research. Rwanda is a landlocked African country with a smaller GDP than Tanzania, and it has achieved 7–9% sustained growth through the same private-sector enablement principles. Mauritius' freeport and flat CIT model is directly applicable to Tanzania's coastal cities and Zanzibar. Vietnam is a large developing country — comparable in population — that used SEZ incentives and regulatory reform to achieve industrialisation. The principles are universal; the specific policies must be adapted to Tanzania's context. That adaptation work is exactly what TISEZA, MKUMBI II, and Vision 2050 are designed to achieve.