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Tax calendar

The online tax calendar shows the key tax deadlines. Register to receive our email tax reminders (based on the dates in this calendar) and never miss another tax deadline.

The red text indicates an entry relevant to companies and employers, black refers to personal tax, and bold indicates an important item.

Click on an item to find out more detail of how it may affect you.

If you would like to receive email reminders before these key tax dates from our taxREMINDER system, then click here to register on our website.

May 2026

June 2026

New Advisory Fuel Rates (AFR) for company car users apply from today. The rates can be found The rates can be found here.

July 2026

Is this relevant to you?

This deadline is relevant to individuals who need to complete a self assessment tax return and make direct payments to HMRC in respect of their income tax, Class 4 NI, capital gains tax and High Income Child Benefit Charge liabilities (unless paid via PAYE).

The second payment on account in respect of income tax and any Class 4 NI is due for payment by 31st July 2026. Interest is charged on any late payments.

If we have already dealt with this matter on your behalf you need take no action.

September 2026

New Advisory Fuel Rates (AFR) for company car users apply from today. The rates can be found The rates can be found here.

October 2026

If we are already dealing with this matter on your behalf you need take no action.

Is this relevant to you?

This deadline is only relevant for those individuals who complete a 'paper' self assessment tax return and who are employees. Where you have an underpayment you may request that HMRC collect the tax outstanding by making an adjustment to your tax code for the year 2027/28.

Please note that where your return is submitted online then the filing deadline for 'coding out' is 30 December 2026.

December 2026

New Advisory Fuel Rates (AFR) for company car users apply from today. The rates can be found The rates can be found here.

Is this relevant to you?

This deadline is relevant for those individuals who complete a self assessment tax return online and who are employees. Where you have an underpayment you may request that HMRC collect the tax outstanding by making an adjustment to your tax code for the year 2027/28.

January 2027

If we are already dealing with this matter on your behalf you need take no action.

Is this relevant to you?

This deadline is relevant to individuals who need to complete a self assessment tax return and make direct payments to HMRC in respect of their income tax, Class 4 or voluntary NICs, capital gains tax and High Income Child Benefit Charge liabilities (unless paid via PAYE).

There is a penalty of £100 if your return is not submitted on time, even if there is no tax due or your return shows that you are due a tax refund.

The balance of any outstanding income tax, Class 4 or voluntary NICs, capital gains tax and High Income Child Benefit Charge (unless paid via PAYE) for the year ended 5th April 2026 is due for payment by 31st January 2027. Where the payment is made late interest will be charged.

The first payment on account for 2026/27 in respect of income tax and any Class 4 NI or High Income Child Benefit Charge (unless paid via PAYE) is also due for payment by 31st January 2027.

March 2027

New Advisory Fuel Rates (AFR) for company car users apply from today. The rates can be found The rates can be found here.

Is this relevant to you?

This deadline is relevant to individuals who need to complete a self assessment tax return and make direct payments to HMRC in respect of their income tax, Class 4 or voluntary NICs, capital gains tax or High Income Child Benefit Charge liabilities (unless paid via PAYE).

The balance of any outstanding income tax, Classes 2 and 4 National Insurance, capital gains tax and High Income Child Benefit Charge (unless paid via PAYE) for the year ended 5th April 2026 was due for payment by 31 January 2027. Where the payment is made late interest will be charged. On 3 March 2027 a late payment penalty of 5% will be added to the outstanding liability.

If we have already dealt with this matter on your behalf you need take no action.

Is this relevant to you?

The final deadline of 5th April 2026 is relevant to individuals who have not considered year-end tax planning issues. These issues include:

  • utilising your annual capital gains tax exemption
  • utilising your annual inheritance tax exemption for gifts
  • utilising your annual Individual Savings Account investment limit (ISA)
  • making additional pension contributions for 2026/27.

Please get in touch if you would like any further advice on these or any other issues.