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UK tax deadline calendar 2026–2027
Key HMRC dates falling in 2026 and 2027, covering the 2025/26 and 2026/27 tax years. Bookmark this page and check before each quarter-end.
January 2026
CIS300 monthly return due (December tax month) + PAYE monthly payment (22nd if paid electronically)
Self Assessment online filing deadline for 2024/25 + balancing payment + 1st payment on account for 2025/26
February 2026
VAT return + payment due for quarter ended 31 December 2025 (quarterly filers)
CIS300 monthly return due (January tax month) + PAYE monthly payment (22nd if paid electronically)
March 2026
CIS300 monthly return due (February tax month) + PAYE monthly payment (22nd if paid electronically)
April 2026
End of 2025/26 tax year
Start of 2026/27 tax year
MTD ITSA mandatory for self-employed + landlords with qualifying income over £50,000
CIS300 monthly return due (March tax month) + PAYE monthly payment (22nd if paid electronically)
May 2026
VAT return + payment due for quarter ended 31 March 2026 (quarterly filers)
CIS300 monthly return due (April tax month) + PAYE monthly payment (22nd if paid electronically)
June 2026
CIS300 monthly return due (May tax month) + PAYE monthly payment (22nd if paid electronically)
July 2026
P11D and P11D(b) deadline for 2025/26 — report expenses and benefits in kind
CIS300 monthly return due (June tax month) + PAYE monthly payment (22nd if paid electronically)
Class 1A NIC due on 2025/26 benefits in kind (19 July if paying by post)
2nd payment on account for 2025/26 Self Assessment
August 2026
VAT return + payment due for quarter ended 30 June 2026 (quarterly filers)
CIS300 monthly return due (July tax month) + PAYE monthly payment (22nd if paid electronically)
September 2026
CIS300 monthly return due (August tax month) + PAYE monthly payment (22nd if paid electronically)
October 2026
Register for Self Assessment if you started self-employment in 2025/26
CIS300 monthly return due (September tax month) + PAYE monthly payment (22nd if paid electronically)
Self Assessment paper filing deadline for 2025/26
November 2026
VAT return + payment due for quarter ended 30 September 2026 (quarterly filers)
CIS300 monthly return due (October tax month) + PAYE monthly payment (22nd if paid electronically)
December 2026
CIS300 monthly return due (November tax month) + PAYE monthly payment (22nd if paid electronically)
January 2027
CIS300 monthly return due (December tax month) + PAYE monthly payment (22nd if paid electronically)
Self Assessment online filing deadline for 2025/26 + balancing payment + 1st payment on account for 2026/27
February 2027
VAT return + payment due for quarter ended 31 December 2026 (quarterly filers)
April 2027
MTD ITSA mandatory for self-employed + landlords with qualifying income over £30,000
Deadlines assume standard registration dates. Late filing and payment penalties apply. Verify specific dates with HMRC or your accountant.
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Tax deadlines — frequently asked questions
- When is the Self Assessment online filing deadline?
- The online Self Assessment deadline for the 2025/26 tax year is 31 January 2027. The paper filing deadline is earlier — 31 October 2026. Missing the deadline incurs an automatic £100 penalty, with further penalties for longer delays.
- When is a VAT return due?
- For quarterly VAT returns, the deadline is one calendar month and 7 days after the end of your VAT period. For example, if your VAT quarter ends 31 March 2026, the return and payment are due by 7 May 2026. MTD-registered businesses must submit digitally.
- When must contractors file a CIS300 monthly return?
- CIS300 is due by the 19th of every month, covering all subcontractor payments in the previous tax month (6th to 5th). Missing the deadline incurs a penalty of £100 per 50 subcontractors, escalating for further delays.
- When is Corporation Tax due?
- Corporation Tax is due 9 months and 1 day after the end of your company's accounting period. The CT600 tax return must be filed within 12 months of the period end.
- When does MTD for Income Tax start?
- MTD for Income Tax Self Assessment has applied since 6 April 2026 to self-employed individuals and landlords with qualifying income over £50,000, extends from 6 April 2027 to income over £30,000, and from 6 April 2028 to income over £20,000. Use the free MTD checker to confirm your position.
- What about Companies House deadlines?
- Companies House deadlines run from your own dates rather than a fixed calendar, so they cannot appear as rows above. Your first accounts are due 21 months after incorporation; after that, 9 months after your financial year end. A confirmation statement is due within 14 days of the end of each 12-month review period. Unlike HMRC's deadlines, these do not move if they fall on a weekend or bank holiday.