HMRC has urged anyone who missed the Self Assessment tax deadline to file their return online immediately and pay any tax owed
Britons who have missed the Self Assessment tax deadline have been urged to take immediate action – but not to telephone HMRC.
In a statement on X (formerly Twitter), HMRC said that anyone who has fallen behind should submit their return online and settle any tax owed without delay. The tax authority cautioned: “Missed the Self Assessment deadline? No need to call. Take action immediately to file your return online and pay any tax owed. “.
The online service enables taxpayers to:
- Submit a Self Assessment if self-employed or if you receive additional income, such as from letting out property.
- Review previous returns, see what you owe, and print tax calculations.
- Register for paperless notifications.
HMRC also reminded first-time filers that they must register for Self Assessment before accessing the service. Anyone with an existing account should ensure it remains active to prevent delays.
Certain taxpayers are unable to use the online system, including partnerships, trusts, estates, non-resident people, and some other specialist cases. Commercial software or paper forms must be utilised instead.
To submit, you’ll require your Unique Taxpayer Reference (UTR) and to log in to the service. HMRC may also request ID, such as a passport or driving licence, to verify your identity.
The warning comes as millions of Brits balance work, bills, and taxes – with penalties for late submission starting at £100, rising quickly the longer returns are delayed.
Late payment penalties.
- Initial penalty: A fixed penalty of £100 immediately after the deadline, even if there is no tax due.
- Three months late: Additional daily penalties of £10 per day, up to a maximum of £900.
- Six months late: An additional penalty of 5% of the tax you owe at this point.
- 12 months late: A further 5% penalty on the outstanding tax, plus potential extra penalties if HMRC deems the delay deliberate or careless.
HMRC also applies interest on unpaid tax from the due date until it’s paid. You can file your return online here.
