| 1 January 2021 | New rules on importing and exporting goods between the EU and Great Britain. |
| 1 March 2021 | VAT domestic reverse charge rules come into effect. |
| 19 April 2021 | Deadline for Employers’ 2020/21 end of year PAYE Returns (P35, P14, P38 & P38A). Penalties for non submission. |
| 6 July 2021 | Form P11D and P11D(B) filing deadline for the tax year 2020-21 |
| 31 July 2021 | The date by which the second payment on account in respect of 2020/2021 must be paid. Consider reducing POA’s if last year’s income has dropped. |
| 5 October 2021 | Deadline for notifying HMRC of new sources of income unless a 2020/2021 tax return has already been issued. Complete form CWF1 for self employment, form SA1 for non self-employed income, or form SA401 for partners. |
| 31 October 2021 | Deadline for submission to HMRC of a paper tax return for 2020/2021. |
| 30 December 2020 | Deadline for e-filing the tax return where the tax payer requires the 2019/2020 balancing payment to be collected through next year’s tax code (less than £2,000). |
| 31 January 2021 | Deadline for submitting online your 2020/2021 self assessment tax return. It is also the date by which the tax payer will be required to settle the 2018/2019 balancing payment and make the first payment on account in respect of 2021/2022. |
