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Important Dates

20 August 2025 — Employer Deductions (All)

Employer deductions payment due for 1 to 15 August for large employers.

Employer deductions payment due for July for small to medium employers.

28 August 2025 - GST Return and payment due

Your GST return and payment is due for the taxable period ending 31 July

28 August 2025 — Overseas-based Student Loans Interim Instalment Due

Interim student loan repayments are due. They count towards your end-of-year repayment obligation.

28 August 2025 - Provisional Tax payments due

Provisional tax payments are due if you have a March balance date and use the standard, estimation or ratio options.

5 September 2025 — Employer Deductions (Large Employers)

Employer deductions payment due for 16 to 31 August for large employers.

20 September 2025 — Employer Deductions (All)

Employer deductions payment due for 1 to 15 September for large employers.

Employer deductions payment due for August for small to medium employers.

29 September 2025 - GST Return and payment due

Your GST return and payment is due for the taxable period ending 31 August.

29 September 2025 - AIM Installments due

AIM (Accounting Income Method) instalments are due if you file GST monthly and have a March balance date.

30 September 2025 — Overseas-based Student Loans

Overseas-based student loan repayments due if you do not have a temporary repayment suspension.

6 October 2025 - Employer Deductions (Large Employers)

Employer deductions payment due for 16 to 30 September for large employers.

20 October 2025 — FBT Due

Your FBT quarterly return and payment are due for the period ending 30 September if you have a March balance date.

20 October 2025 — Employer Deductions (All)

Employer deductions payment due for September for small to medium employers.
Employer deductions payment due for 1 to 15 October for large employers.

28 October 2025 — Provisional Tax Due

Provisional tax payments are due if you have a March balance date and use the ratio option.

Calculators

Kiwisaver Employer Deductions Calculator

Quick Retirement Calculator

Quick Mortgage Calculator