Key Tax Dates for the 31st March 2027 Financial Year

Some key tax dates below, not an exhausted list, but the most common for small business owners with a standard balance date in relation to Income Tax, Fringe Benefit Tax and Goods and Services Tax.

Employee deductions are standard 20th of the month following (exception for large employers)

There are other taxes due, and due dates that vary (student loans, AIM returns, RWT on dividends, small business cashflow loan etc.) so as mentioned, the below is a very generic list for reference. If unsure, please get in contact with us.

07th April 2026

  • Terminal tax payment due for 31st March 2026 financial year

07th May 2026

  • GST return and payment is due for the taxable period ending 31st March 2026

  • Final provisional tax payment due for 31st March 2026 financial year

28th June 2026

  • GST return and payment is due for the taxable period ending 31st May 2026

7th July 2026

  • Income tax returns required to be filed for year ending 31st March 2026 - (for clients who have lost extension of time privileges)

28th August 2026

  • GST return and payment is due for the taxable period ending 31st July 2026

  • 1st provisional tax payment due for 31st March 2027 financial year

28th October 2026

  • 1st provisional tax payment due for 31st March 2027 financial year (6 monthly GST filers - generally sole traders)

  • GST return and payment is due for the taxable period ending 30th September 2026

15th January 2027

  • GST return and payment is due for the taxable period ending 30th November 2026

  • 2nd provisional tax payment due for 31st March 2027 financial year

7th February 2027

  • Terminal tax payment due for 31st March 2026 financial year (for clients who have lost extension of time)

28th February 2027

  • GST return and payment is due for the taxable period ending 31st January 2027

31st March 2027

  • Income tax returns required to be filed for year ending 31st March 2026 - (for clients who have extension of time)

7th April 2027

  • Terminal tax payment due for 31st March 2026 financial year (extension of time clients)

7th May 2026

  • GST return and payment is due for the taxable period ending 31st March 2027

  • Final provisional tax payment due for 31st March 2027 financial year