Self Assessment tax return deadline

For individuals who file Self Assessment tax returns, 31 January is a key deadline. Online tax returns must normally be submitted by this date, along with payment of any tax due. Late filing or payment can result in penalties and interest.

End of the tax year

The UK tax year runs from 6 April to 5 April of the following year. This marks the end of the tax year and is an important point for ensuring that relevant financial and tax records are complete and up to date.

Start of the new tax year

As one tax year closes, another begins. This is an important time to be aware of any changes to tax rates, allowances or rules that may apply during the new tax year.

Second payment on account deadline

If you make payments on account towards your Self Assessment tax bill, the second payment is normally due by 31 July. Payments on account are advance payments towards your tax bill and are generally based on your previous year’s liability.

Register for Self Assessment

If you need to complete a Self Assessment tax return for the first time, you will generally need to notify HMRC by 5 October following the end of the relevant tax year.

If you are already registered for Self Assessment, you do not normally need to register again. If your circumstances have changed and you no longer need to submit a return, HMRC should be informed.

Paper tax return deadline

If you submit a paper Self Assessment tax return rather than filing online, the deadline is normally 31 October following the end of the relevant tax year.