Tanzania's commercial banking sector is profitable, stable, and growing — yet it is structurally incapable of financing the business investment and capital formation that FYDP IV (2026/27–2030/31) requires. More importantly for the development finance question, it cannot serve as the source of senior debt that infrastructure and investment projects structurally depend on. This is not a governance failure. It is a set of deep, interlocking structural constraints that make long-term project lending rational to avoid for commercial banks — and impossible to provide safely without the institutional architecture that Tanzania does not yet possess.

This report serves as the second part of TICGL's research series on Tanzania's development finance landscape. The first part established why Tanzania cannot develop without external finance and why the private sector — responsible for more than 70% of FYDP IV investment — structurally requires the debt and risk-mitigation layers of development finance. This report goes deeper: it explains precisely why Tanzania's domestic commercial banks cannot provide the senior debt layer that every major investment project requires.

To understand why the domestic banking sector's limitations are so consequential for Tanzania's development, it is necessary to revisit the capital stack mechanics of project finance. No major infrastructure or investment project is financed 100% from investor equity. Every project is structured using a layered capital stack in which senior debt — typically 50–60% of total project cost — is the largest single component.

Senior debt must be arranged before equity can be deployed. An investor bringing 25% equity to a USD 100 million project needs to borrow USD 75 million. If that borrowing cannot be arranged — at the right tenor, at a viable interest rate, with appropriate security structures — the equity never moves. This is the direct mechanism behind Tanzania's 22% FDI disbursement rate: registered projects are not stalling because investors lack appetite. They are stalling because the senior debt layer cannot be assembled domestically.

The root cause of the tenor constraint is not risk appetite, regulatory timidity, or governance failure. It is a fundamental banking principle: a bank cannot safely lend money for 15 years when its depositors can withdraw their funds in 3 months. Tanzania's commercial banks primarily hold short-term liabilities — current accounts and savings accounts with average tenors of 3–6 months. If a bank were to originate a 15-year infrastructure loan funded by 3-month deposits, it would face a liquidity crisis the moment depositors withdrew funds.

For commercial banks to safely originate 10–25 year loans, they need 10–25 year funding sources: pension fund term deposits, long-term bank bonds, infrastructure bond proceeds, or DFI long-term facilities. Tanzania currently lacks all of these at the scale required. The solution is not to pressure banks to lend longer — it is to build the long-term funding instruments that would allow banks to do so safely.

The FYDP IV Commercial Banking Capacity Analysis identifies twelve structural constraints that prevent Tanzania's commercial banks from financing business investment. Each constraint independently limits lending capacity. Together, they create a system in which commercial banks are rationally, structurally, and safely prevented from providing the credit that development requires.

Tanzania's banks primarily mobilise short-term deposits — current accounts and savings accounts with average tenors of 3–6 months. This deposit structure makes it prudentially impossible for banks to originate 10–15 year investment loans without unacceptable maturity mismatch risk.

Treasury Bills and bonds yield 10–15% risk-free. This creates a rational incentive structure in which commercial banks prefer holding government securities to originating complex, risky, and expensive commercial loans. A bank earning 13% on a Treasury Bill must earn significantly more than 13% on a commercial loan to justify the additional credit risk, documentation burden, and monitoring cost.

Tanzania's banking regulations require tangible, marketable collateral for commercial loans. Only approximately 13% of Tanzania's land is formally surveyed and titled. Infrastructure and investment projects are typically financed through Special Purpose Vehicles (SPVs) — new legal entities with no operating history and few tangible assets beyond the project itself. Their security package is cash flow-based: revenue ring-fencing, escrow arrangements, and contractual rights. Tanzania's collateral-based banking architecture cannot evaluate or accept these security structures.

Credit bureaux cover less than 60% of adults. Most businesses have no audited accounts, no tax records, and no formal cash flow histories. For new projects — greenfield infrastructure, new manufacturing facilities — there is no operating history by definition. Project finance globally addresses this through financial modelling of projected cash flows and independent market studies. Tanzania's banks lack the skills to conduct this analysis and the frameworks to accept projected cash flows as a credit basis. Only DFIs with dedicated project finance teams have this capacity.

Tanzania's banking system lacks the long-term funding instruments — corporate bonds, covered bonds, mortgage-backed securities, infrastructure bonds — that would allow banks to match long-term lending with long-term funding. Tanzania needs TZS 5T+ in infrastructure bonds outstanding, deep pension fund participation, and a functioning secondary market before this constraint is meaningfully relaxed.