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What are the penalties for failing to submit a tax return on time?
Late returns, or failure to file a return at all, will result in an automatic penalty of £100 with further interest and surcharges added where tax remains unpaid.
If you have a reasonable excuse for failing to file your return on time you can appeal, and if HM Revenue and Customs agree, the penalty will be cancelled. Remember to tell HMRC as soon as possible if you have a problem that means you are unable to file your return by the deadline.
The GOV.UK website has more information on the kinds of circumstances that HMRC will accept as a reasonable excuse for the late filing of a tax return.