• The tax year runs from the 6th April 2019 – 5th April 2020. Your accounts need to be calculated according to these dates. You can start submitting your tax return on the first day of the next tax year 6th April.

  • 31 October: the deadline for paper filing of tax returns 

  • 30 December: If you are also employed, you can choose to pay any tax due through your PAYE code, instead of making a big payment on 31 January, but only if you submit your tax return before 30 December.

  • 31 January: The deadline for online self-assessment filing. It is also the deadline for paying any income tax due, Class  4NIC and your first payment on account for next year.

  • 31 July: when your second payment on account becomes due.