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What are the deadlines to submit a self-assessment tax return?

Updated: Apr 3

The UK Self-assessment is a system employed by the HMRC to collect taxes from individuals. If you earn income from non-UK sources or work for yourself, you must submit a self-assessment tax return. Check the specific criteria on HMRC's website.

In cases where income is taxed at the source, such as through PAYE, filing a tax return is usually unnecessary as tax has already been paid to HMRC.


Person is using a calculator, possibly to verify figures on the invoice or to calculate totals

What are the deadlines for submitting a self-assessment tax return?

The filing deadline for the 2022-23 tax year is 31 January 2024. Ensure timely submission to avoid penalties.


How do I register for self-assessment?

To register, complete HMRC’s form SA1 and return it. Upon approval, you'll receive a self-assessment record and a Unique Taxpayer Reference (UTR) number, which must be included in your tax return. Self-employed individuals follow a different registration process.


Consequences of missing the tax return deadline

Failure to file by 31 January incurs an automatic £100 penalty. Additional penalties may accrue until submission, and HMRC charges interest on late-paid tax.


What to do if you no longer meet the criteria?

If you no longer meet self-assessment criteria, deregister to avoid penalties. Failure to do so may result in penalties for unsubmitted tax returns.

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