Tax calendar

September–October 2026 filing windows. If a holiday moves a date, the revenue calendar governs.

VAT-1 and withholding are typically the 26th of the following month; SSI monthly the 23rd; provisional tax the 17th of the second month after the quarter.

23 September: SGK aylık bildirge
26 September: KDV-1 / Muhtasar (Ağustos)
17 October: Geçici vergi 2026/Q3
26 October: KDV-1 / Muhtasar (Eylül)
31 October: Damga vergisi

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Demo figures; confirm against the communiqué and the live file.