Turkey Issues QDMTT Return Filing Extension and Opens the Filing Test Environment

Filing Extension

Article 46 of the Law applies a domestic minimum tax (‘QDMTT’) from January 1, 2024.

Article 46(3) requires submission of a QDMTT self- assessment return (a ‘DMT Top-Up Tax Return’) within 12 months of the end of the accounting period.

For the 2024 accounting period this was due by December 31, 2025. 

On December 1, 2025, Turkey issued Tax Procedure Law Circular 193 to extend the filing and payment date for the QDMTT return for the 2024 tax period from December 31, 2025 to January 15, 2026.

Filing Test Environment

On December 1, 2025, Turkey also announced the opening of a test environment for the QDMTT Return submission. 

In order to access the test environment, authorised entities are required to signify a “0063 – Local Minimum Complementary Corporate Tax” liability in their own name at the tax office directorates to which they are affiliated.

After this, the relevant users can log into the Digital Tax Office with their current user code and password, access the e-Declaration Test module and carry out data entry and calculation operations for test purposes in the relevant declaration.