Rethinking corporate tax: A critical review of Tanzania’s fiscal balance

DAR ES SALAAM: TANZANIA’S corporate tax system, designed to support public revenue while attracting business investment, has undergone significant reforms over the years.

Yet, despite these efforts, it continues to face structural inefficiencies and inequities that constrain the country’s economic potential.

Since its establishment in 1996, the Tanzania Revenue Authority (TRA) has implemented a series of measures aimed at improving tax administration.

However, gaps in policy effectiveness and execution remain evident. At the centre of the debate is the uniform corporate tax rate of 30 per cent, applied across all resident corporations.

While intended to strike a balance between attracting foreign investment and generating public revenue, this flat rate raises questions about its suitability in an economy where the informal sector accounts for approximately 47 per cent of GDP and small and medium-sized enterprises (SMEs) play a central role.

For many SMEs, the current rate is seen as inhibitive, potentially constraining domestic enterprise, limiting innovation and discouraging formalisation.

Legal framework and policy structure Tanzania’s corporate tax regime is underpinned by a comprehensive legal and policy framework.

At its core is the Income Tax Act, 2004, which defines taxable income, sets the 30 per cent corporate tax rate, and outlines available deductions and exemptions.

Smaller businesses operate under a presumptive tax regime, while sectors such as mining and petroleum are governed by specialised provisions.

The Value Added Tax (VAT) Act, 2014 complements this framework by influencing corporate tax liabilities through VAT compliance requirements.

Meanwhile, the Investment Act, 1997 provides tax holidays, exemptions and preferential rates for sectors deemed strategic to national development.

Further sector-specific provisions are contained in the Mining Act, 2010 (amended in 2017), which aims to enhance transparency and ensure equitable revenue sharing.

Annual Finance Acts reflect shifting fiscal priorities through adjustments to tax laws, rates and incentives. The Public-Private Partnership (PPP) Act, 2010 supports infrastructure and energy investments by offering tax incentives to participating firms.

Tax administration is centralised under the Tax Administration Act, 2015, which empowers the TRA to enforce compliance, manage registration and resolve disputes.

Regionally, Tanzania’s membership in the East African Community (EAC) and the Southern African Development Community (SADC) influences tax policy through efforts to harmonise systems and minimise double taxation.

Together, these instruments provide a robust framework. However, their effectiveness ultimately depends on consistent implementation, administrative efficiency and the ability to adapt to evolving economic conditions.

Data trends: growth with volatility An analysis of corporate tax collections between 1996 and 2022 reveals a clear upward trajectory in real terms.

Linear regression results indicate a strong relationship between time and tax revenue, with an Rsquared value of approximately 0.828—suggesting that 82.8 per cent of variation in inflation-adjusted corporate tax revenue is explained by time progression.

However, this growth is accompanied by significant volatility. A standard deviation of roughly 942,696 and a coefficient of variation of 1.045 indicate that annual collections fluctuate considerably.

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While revenues have increased over the long term, year-to-year unpredictability remains a challenge, influenced by economic conditions, corporate profitability and policy shifts. This volatility complicates fiscal planning, limiting the government’s ability to rely on stable corporate tax revenues.

To address this, policymakers may need to explore measures such as diversifying the tax base or introducing mechanisms to stabilise revenue flows. Declining share in national income A deeper structural concern emerges from the Corporate Tax-to-GNI ratio.

Data from 1996 to 2022 shows a consistent decline—from around 1.52 per cent in 1996 to significantly lower levels by 2022, with an average of 1.19 per cent. This trend stands in contrast to overall tax revenue, which has steadily increased.

The divergence suggests a shift in Tanzania’s tax structure, with greater reliance on other sources such as VAT and personal income taxes.

While this may reflect improved revenue collection, it also raises concerns about declining corporate tax contributions relative to national income.

Possible explanations include the impact of tax incentives, compliance gaps, structural economic changes, or the expansion of sectors less effectively captured by corporate taxation.

The implication is clear: aligning corporate tax contributions more closely with economic growth remains a critical policy challenge. Global context and policy comparisons Globally, corporate tax rates vary widely, reflecting differing economic priorities.

An analysis of 148 countries shows that the 20–30 per cent range is the most common, encompassing 47 per cent of countries, including major economies such as the United States, Germany, China and developing countries like Kenya, Tanzania and India.

This range is generally seen as balancing investment attraction with revenue generation. At the lower end, 0–10 per cent tax rates—found in about 9 per cent of countries, including the Bahamas, Cayman Islands and Hungary—are typically associated with tax havens that rely on alternative revenue streams such as tourism and financial services.

Countries with rates between 10 and 20 per cent, including Ireland, Singapore and Romania, often use targeted incentives to attract investment in key sectors.

At the higher end, 30–40 per cent rates—applied in countries such as Argentina, Brazil and Malta—prioritise revenue but may reduce competitiveness.

Overall, the global trend favours moderate rates, with most countries clustering between 10 and 30 per cent, underscoring the importance of balance in tax policy design.

Tax rates and economic growth The relationship between corporate tax rates and economic growth is neither linear nor uniform.

Countries with tax rates in the 0–10 per cent bracket record the highest average GDP growth at 9.7 per cent, suggesting that minimal tax burdens can stimulate investment and expansion—though this is often influenced by unique structural factors.

In the 10–20 per cent range, growth averages 4.37 per cent, indicating that moderate taxation may begin to impose constraints.

Interestingly, growth recovers in the 20–30 per cent bracket, averaging 5.46 per cent, while the 30–40 per cent range records a slightly higher average of 5.56 per cent. This suggests that higher tax rates can be sustainable when supported by effective fiscal policies and broader economic stability.

These findings highlight the complexity of tax policy, where outcomes depend not only on rates but also on governance, efficiency and economic structure.

The case for reform Taken together, the evidence points to the need for a more flexible and differentiated corporate tax system in Tanzania. While the current 30 per cent rate aims to balance revenue and investment, it does not fully reflect the diversity of the economy.

A one-size-fits-all approach may disproportionately affect SMEs while failing to capture the full potential of larger or more profitable sectors.

A more nuanced framework— one that considers business size, sector dynamics and economic contribution—could enhance fairness, improve compliance and stimulate growth. Epilogue Tanzania’s corporate tax system stands at a crossroads.

While progress has been made in revenue collection and policy development, structural challenges remain. The interplay between tax rates, economic growth and revenue sustainability underscores the need for careful, evidence-based reform.

A shift towards flexibility, fairness and effective enforcement— combined with a differentiated approach across sectors—could help build a more resilient and inclusive fiscal system.

The task ahead is not simply to adjust tax rates, but to redesign the system in a way that supports long-term growth while ensuring sustainable revenue for national development.