Tax Calendar 2025/26
Key UK tax dates and HMRC deadlines for the current tax year.
Start of 2025/26 tax year
The new tax year begins. New rates and thresholds take effect.
P60 deadline
Your employer must give you your P60 for the previous tax year by this date.
P11D deadline (employers)
Employers must file P11D forms for benefits in kind with HMRC.
Second payment on account due
If you make payments on account for Self Assessment, the second payment is due.
Register for Self Assessment
Deadline to register for Self Assessment if you need to file a tax return for the first time.
Paper Self Assessment deadline
If filing a paper Self Assessment return for 2024/25, it must reach HMRC by this date.
Online Self Assessment deadline
Deadline to file your online Self Assessment return for 2024/25 and pay any tax owed. Also the first payment on account for 2025/26.
Late filing penaltyUPCOMING
If you missed the 31 January deadline, a £100 penalty applies. Further penalties accrue after 3 months, 6 months, and 12 months.
End of 2025/26 tax year
Last day of the current tax year. Use up any remaining ISA allowance, capital gains annual exemption, etc.