Key Dates

Self Assessment Key dates

Deadline

First day of the new tax year 2020/21.
Time to gather detailed documents for your 2019/20 tax return.
6 April 2020
Deadline for 2nd payment on account for tax year ending 5 April 2020. 31 July 2020
Deadline to register with the HMRC if you became self-employed or started receiving income from property. You should submit a form CWF1 for self-employment or form SA1 for non-self-employed income to HMRC. 5 October 2020
Deadline for paper self-assessment returns for 2018/19 tax year. 31 October 2020(Midnight)
Deadline for online submission of self-assessment tax returns for year ending 5 April 2019 for HMRC to collect employment or pension income tax through PAYE tax codes if less than tax codes if less than £3,000 is owed. 30 December 2020
Deadline for online self-assessment tax returns for 2019/20 tax year.
Deadline for paying tax bill for tax year ending 5 April 2019/20.
31 October 2020(Midnight)
End of tax year 20/21 5 April 2021

PAYE Key dates

Deadline

End of the last tax year and deadline for claiming your PAYE tax refund for the 2015/16 tax year. 5 April 2020
First day of the new tax year 2020/21 6 April 2020
Copies of 2019/20 P60 documents issued to employees 31 May 2020
Copies of 2019/20 P11D documents issued to employees.
Last date for agreeing payment settlement agreements for 2018/19 if applicable.
6 July 2020
End of tax year 20/21 6 April 2021