PAYE key dates

Type	Deadline
End of last tax year and deadline for claiming PAYE tax refund for 2019/20 tax year	05/04/2024
First day of the new tax year 2024/25	06/04/2024
2023/24 P60 documents must be issued to employees	31/05/2024
2023/24 P11D documents must be issued to employees	06/07/2024
Last day for agreeing payment settlement agreements for 2023/24	06/07/2024
Deadline for paying Class 1A NI contributions on benefits to employees, such as private medical insurance	22/07/2024
Second Income Tax and NI payment on account deadline	31/07/2024

Self-assessment key dates

Type	Deadline
Deadline for claiming tax overpaid for the 2019/20 tax year under Self Assessment	05/04/2024
First day of the new tax year 2024/25	06/04/2024
Time to gather detailed documents for your 2023/24 tax return	06/04/2024
Deadline for 2nd payment on account for income tax year ending 5th April 2024	31/07/2024
Deadline to register with HMRC if you became self-employed or started receiving income from property in the 2023/24 tax year	05/10/2024
Deadline for paper Self Assessment returns for 2023/24 tax year	31/10/2024
Deadline for online submissions of Self Assessment tax returns for the year ending 5th April 2023 for HMRC to collect employment or pension income tax through PAYE codes (if less than £3,000 owed)	30/12/2024
Deadline for filing your Company's annual accounts if you have a year end of 31st March	31/12/2024
Deadline for paying tax bill for year ending 5th April 2024	31/01/2025
Deadline for amending tax return for year ending 5th April 2023	31/01/2025
End of tax year 2024/25	05/04/2025