Key UK Tax Dates & Deadlines
Don't miss a deadline. Key dates for the 2026/27 tax year — add them to your calendar in one click.
Add reminders to your calendar so you don't miss a deadline.
2026/27 tax year
End of 2025/26 tax year
Last day to use your ISA, pension, and Capital Gains Tax allowances for the 25/26 year.
Start of 2026/27 tax year
New tax bands, rates, and allowances come into effect.
P60 Deadline
Employers must provide P60 forms to employees working for them on 5 April.
P11D Deadline
Employers must issue P11D forms (for benefits in kind) to relevant employees.
Payment on Account Deadline
Second Payment on Account due for the 2025/26 tax year.
Self Assessment Registration
Deadline to register for Self Assessment if you need to file a return for the first time for 2025/26.
Paper Tax Return Deadline
Deadline for submitting a paper Self Assessment tax return for 2025/26.
PAYE Tax Collection Deadline
Deadline to submit your online tax return if you want HMRC to collect underpaid tax (up to £3,000) through your PAYE tax code.
Online Tax Return Deadline
Deadline for submitting your online Self Assessment tax return for 2025/26. Also the deadline to pay any tax you owe for 25/26, plus your first Payment on Account for 2026/27.
2025/26 tax year
End of 2024/25 tax year
Last day to use your ISA, pension, and Capital Gains Tax allowances for the 24/25 year.
Start of 2025/26 tax year
New tax bands, rates, and allowances come into effect.
P60 Deadline
Employers must provide P60 forms to employees working for them on 5 April.
P11D Deadline
Employers must issue P11D forms (for benefits in kind) to relevant employees.
Payment on Account Deadline
Second Payment on Account due for the 2024/25 tax year.
Self Assessment Registration
Deadline to register for Self Assessment if you need to file a return for the first time for 2024/25.
Paper Tax Return Deadline
Deadline for submitting a paper Self Assessment tax return for 2024/25.
PAYE Tax Collection Deadline
Deadline to submit your online tax return if you want HMRC to collect underpaid tax (up to £3,000) through your PAYE tax code.
Online Tax Return Deadline
Deadline for submitting your online Self Assessment tax return for 2024/25. Also the deadline to pay any tax you owe for 24/25, plus your first Payment on Account for 2025/26.
Frequently Asked Questions
When does the UK tax year start and end?
The UK tax year starts on 6 April and ends on 5 April the following year. For example, the 2026/27 tax year runs from 6 April 2026 to 5 April 2027.
When is the Self Assessment tax return deadline?
For the 2025/26 tax year, the paper return deadline is 31 October 2026. The online return deadline and the deadline to pay any tax you owe is midnight on 31 January 2027.
What are Payments on Account?
Payments on Account are advance payments towards your tax bill for the current year. They are due in two installments: 31 January and 31 July. Each payment is half of your previous year's tax bill.
Need help calculating your tax?
Use our free calculators to estimate your take-home pay, self-assessment bill, or capital gains tax.