November 2026:

1 November 2026 – Due date for Corporation Tax payable by companies with an accounting period ended 31 January 2026, unless the company is required to pay Corporation Tax by instalments.
7 November 2026 – Deadline for the second quarterly update under Making Tax Digital for Income Tax for the 2026-27 tax year. This applies to individuals who are within MTD for Income Tax from April 2026 and covers the second quarterly update period.
7 November 2026 – VAT returns and payments are normally due for VAT accounting periods ended 30 September 2026, unless an alternative deadline applies, for example under the Annual Accounting Scheme.
19 November 2026 – PAYE and National Insurance deductions for the month ended 5 November 2026 must reach HMRC by this date where payment is made by post. Where payment is made electronically, the normal deadline is 22 November 2026.
19 November 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 November 2026.
19 November 2026 – CIS tax deducted for the month ended 5 November 2026 must reach HMRC by this date if payment is made by post. Where payment is made electronically, the normal deadline is 22 November 2026.
30 November 2026 – Companies with an accounting period ended 30 November 2025 must normally submit their Corporation Tax return to HMRC by this date.
30 November 2026 – Private companies with an accounting period ended 28 February 2026 will normally need to file their accounts at Companies House by this date. Different deadlines can apply to a company's first accounts or where the accounting reference date has been changed.

December 2026:

1 December 2026 – Due date for Corporation Tax payable by companies with an accounting period ended 28 February 2026, unless the company is required to pay Corporation Tax by instalments.
7 December 2026 – VAT returns and payments are normally due for VAT accounting periods ended 31 October 2026, unless an alternative deadline applies, for example under the Annual Accounting Scheme.
19 December 2026 – PAYE and National Insurance deductions for the month ended 5 December 2026 must reach HMRC by this date where payment is made by post. Where payment is made electronically, the normal deadline is 22 December 2026.
19 December 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 December 2026.
19 December 2026 – CIS tax deducted for the month ended 5 December 2026 must reach HMRC by this date if payment is made by post. Where payment is made electronically, the normal deadline is 22 December 2026.
30 December 2026 – Deadline for filing the 2025-26 Self-Assessment tax return online where an individual wants HMRC to collect a Self-Assessment liability of less than £3,000 through their PAYE tax code, subject to HMRC's normal conditions.
31 December 2026 – Companies with an accounting period ended 31 December 2025 must normally submit their Corporation Tax return to HMRC by this date.
31 December 2026 – Private companies with an accounting period ended 31 March 2026 will normally need to file their accounts at Companies House by this date. Different deadlines can apply to a company's first accounts or where the accounting reference date has been changed.

Other deadlines to remember

Capital Gains Tax on most disposals of UK residential property must normally be reported and paid within 60 days of completion. The actual deadline therefore depends upon the completion date rather than being a fixed monthly diary date.

Employers should also remember that Full Payment Submissions under PAYE Real Time Information are normally required on or before the date employees are paid.

1 October 2026 – Corporation Tax payment is due for companies with an accounting period ending 31 December 2025, unless the company is required to make quarterly instalment payments.

5 October 2026 – Deadline for notifying HMRC of a new liability to Income Tax or Capital Gains Tax for the 2025–26 tax year. This may include registering for Self Assessment if you became self-employed, started receiving taxable rental income or received other income or gains that have not already been taxed.

7 October 2026 – VAT returns and payments are normally due for accounting periods ending 31 August 2026, unless a different deadline applies. Businesses paying by Direct Debit should allow sufficient time for HMRC to collect the payment.

19 October 2026 – PAYE, employee and employer National Insurance contributions, student loan deductions and Construction Industry Scheme deductions are due for the month ended 5 October 2026 if payment is made by post.

19 October 2026 – Deadline for submitting the CIS300 monthly return for the month ended 5 October 2026.

22 October 2026 – Electronic payments of PAYE, National Insurance contributions, student loan deductions and CIS deductions are due for the month ended 5 October 2026.

22 October 2026 – Electronic payment deadline for tax and Class 1B National Insurance contributions due under a PAYE Settlement Agreement for the 2025–26 tax year. The deadline is 19 October 2026 if payment is not made electronically.

31 October 2026 – Deadline for submitting a paper Self Assessment tax return for the year ended 5 April 2026. Taxpayers who miss the paper filing deadline can normally file online by 31 January 2027 instead.

31 October 2026 – Corporation Tax returns are due for companies with an accounting period ending 31 October 2025.

31 October 2026 – Companies House accounts are due for private companies with an accounting period ending 31 January 2026. Different deadlines apply to a company’s first accounts.

31 October 2026 – Plastic Packaging Tax returns and payments are due for the quarter ended 30 September 2026 where the business is registered for the tax.

1 November 2026 – Corporation Tax payment is due for companies with an accounting period ending 31 January 2026, unless the company is required to make quarterly instalment payments.

7 November 2026 – VAT returns and payments are normally due for accounting periods ending 30 September 2026, unless a different deadline applies. Businesses paying by Direct Debit should allow sufficient time for HMRC to collect the payment.

19 November 2026 – PAYE, employee and employer National Insurance contributions, student loan deductions and Construction Industry Scheme deductions are due for the month ended 5 November 2026 if payment is made by post.

19 November 2026 – Deadline for submitting the CIS300 monthly return for the month ended 5 November 2026.

22 November 2026 – Electronic payments of PAYE, National Insurance contributions, student loan deductions and CIS deductions are due for the month ended 5 November 2026. As 22 November 2026 falls on a Sunday, businesses should arrange payment early enough for the cleared funds to reach HMRC by the deadline.

30 November 2026 – Corporation Tax returns are due for companies with an accounting period ending 30 November 2025.

30 November 2026 – Companies House accounts are due for private companies with an accounting period ending 28 February 2026. Different deadlines apply to a company’s first accounts.

1 September 2026 – Due date for corporation tax due for the year ended 30 November 2025.

19 September 2026 – PAYE and NIC deductions due for month ended 5 September 2026. (If you pay your tax electronically the due date is 22 September 2026)

19 September 2026 – Filing deadline for the CIS300 monthly return for the month ended 5 September 2026. 

19 September 2026 – CIS tax deducted for the month ended 5 September 2026 is payable by today.

1 October 2026 – Due date for Corporation Tax due for the year ended 31 December 2025.

19 October 2026 – PAYE and NIC deductions due for month ended 5 October 2026. (If you pay your tax electronically the due date is 22 October 2026)

19 October 2026 – Filing deadline for the CIS monthly return for the month ended 5 October 2026. 

19 October 2026 – CIS tax deducted for the month ended 5 October 2026 is payable by today.

31 October 2026 – Latest date you can file a paper version of your 2025-26 self-assessment tax return.