Important Dates: Your tax calendar for December 2025 & January 2026

The end of the year brings more than holiday plans — it also brings a wave of important tax deadlines. December and January are two of the busiest months in the compliance calendar, and missing a key date can lead to unnecessary penalties or cash flow pressure.

To help you stay organised, we’ve outlined the essential tax dates for December 2025 and January 2026, along with the actions you need to take to stay on track. Use this calendar to plan ahead, prepare paperwork early, and avoid last-minute stress.

Tax calendar December 2025 & January 2026

If you need help managing your obligations, forecasting payments, or planning for upcoming tax dates, contact us for expert guidance and support.

DATE	CATEGORY	DESCRIPTION
5 December 2025	PAYE	Large employers’ payment due. File employment information within two working days after payday.
22 December 2025	RWT	Return and payment due for withholding tax deductions from dividends and deductions of $500 or more from interest paid during November.
22 December 2025	PAYE	Small and large employers’ payment due. File employment information within two working days after payday.
15 January 2026	Provisional Tax	Instalment due
15 January 2026	GST	Payment and return for November
15 January 2026	PAYE	Large employers’ payment due. File employment information within two working days after payday.
20 January 2026	PAYE	Small and large employers’ payment due. File employment information within two working days after payday.
20 January 2026	FBT	Return and payment due for the December 2025 quarter.
28 January 2026	GST	Return and payment for December