Corporate tax returns for the 2025 accounting period must be filed between 1 and 30 April 2026, and the tax assessed must be paid within the same period. This is the first period in which the domestic minimum corporate tax introduced by Law No. 7524 is applied on the annual return.

1. Filing and payment

Companies with a special accounting period file by the evening of the last day of the fourth month following the month in which the accounting period ends.

2. What is the domestic minimum corporate tax?

Under Article 32/C of the Corporate Tax Law, the corporate tax calculated cannot be less than 10% of corporate income before deductions and exemptions. In other words, if the tax the taxpayer pays after exemptions and deductions is below this minimum, the difference is payable.

The minimum tax base is generally calculated as: commercial balance sheet profit + non-deductible expenses − exemptions and deductions allowed in the minimum tax calculation.

3. Main items deductible in the minimum tax calculation

• Participation income from fully liable companies,
• Share premium gains,
• The technology development zone income exemption and R&D and design deductions,
• Income from exports of goods manufactured in free zones,
• Venture capital fund and sheltered workshop deductions,
• Exemptions for rebates, sale-and-leaseback and income from ships registered in the Turkish International Ship Registry,
• Tax not paid due to reduced corporate tax and investment contribution amounts under incentive certificates obtained before the publication of Law No. 7524.

4. Who is outside the minimum tax and points to watch

• Companies starting business for the first time are outside the minimum tax for three accounting periods, including the period in which they start.
• Prior-year losses cannot be deducted from the minimum tax base; for companies with prior-year losses, the effect of the minimum tax should be calculated separately.
• The minimum tax calculation is also made in provisional tax periods.

5. Example

6. Assessment

When preparing the return, the minimum tax comparison must be made, each exemption and deduction must be checked to see whether it is deductible in the minimum tax calculation, and taxes paid in provisional tax periods must be offset.

This circular is for general information only. Please contact us about your specific situation. The Turkish original is available here.

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