DAR ES SALAAM — Tanzania’s combined nominal gross domestic product (GDP) reached TZS243.35 trillion in 2025 following a revision of the country’s national accounts, giving businesses and investors an updated picture of the size and structure of the economy.
The Bank of Tanzania reported that Mainland Tanzania’s nominal GDP for 2025 increased to TZS234.104 trillion, from TZS230.073 trillion under the previous statistical series. Zanzibar’s nominal GDP was revised to TZS9.242 trillion, from TZS7.029 trillion.
The exercise changed the base year used to calculate GDP from 2015 to 2019, allowing statisticians to better reflect changes in economic activity and the relative contribution of different sectors.
The revised figures should not be interpreted as TZS6.2 trillion of new production suddenly being created. GDP rebasing updates the statistical measurement of economic activity; it does not, by itself, mean that businesses produced more goods or services during the period.
The updated figures come alongside continued economic growth. According to the Bank of Tanzania’s Monetary Policy Committee, Mainland Tanzania’s economy grew by 6 percent in the first quarter of 2026, with growth estimated to have exceeded 6 percent in the second and third quarters. Zanzibar recorded 6.7 percent growth in the first quarter, with stronger growth estimated in the following two quarters.
Financial services, industrial production, infrastructure investment and social services supported Mainland growth, while tourism, construction and irrigation projects contributed to activity in Zanzibar.
For businesses, updated national accounts can help provide a more current picture of the economy and the sectors contributing to it. Investors and policymakers use GDP data alongside other indicators to assess market size, productivity and economic trends.
However, the headline GDP figure alone does not show how income is distributed, whether operating costs are falling or whether individual businesses are becoming more profitable. Companies still need to examine sector-specific demand, access to finance, inflation, infrastructure and customer purchasing power.
The revision also reinforces the importance of using consistent data when comparing economic performance over time. Businesses assessing market opportunities should pay attention to the revised series rather than treating the old and new figures as if they were calculated on exactly the same basis.
For Tanzania, the value of rebasing lies in improving the information used to guide economic decisions. The next challenge is ensuring that this clearer statistical picture supports investment, productivity and growth across businesses of different sizes.
