The deadline for submission of certified public accountant attestation reports, which must be submitted by the end of 30 June 2020, to the Ministry of Treasury and Finance and tax offices has been extended for two months.
There is no time extension for reports having deadlines after 30 June 2020.
Please see this link for full text of the Circular of Law on Independent Accountant and Financial Advisor and Certified Public Accountant number 1 and dated 26 March 2020 of the Turkish Revenue Administration (only available in Turkish).