When is the self-assessment tax return deadline – and what happens if I miss it?

  • When is the self-assessment tax return deadline – and what happens if I miss it? 1

The deadline for filing your online Self assessment Tax return for the tax year ending on 5 April 2017 is 31st January 2018.

If you miss this deadline by just one day you're already looking at a £100 fine.

  • After 3 months, an additional £10 per day up to £900!
  • After 6 months, a penalty of 5% or £300, whichever is greater
  • After 12 months, another 5% or £300, whichever is greater
  • This could lead to a £1600 fine, without even paying any tax owed!

Need help with your tax return?

By giving you a fixed, competitive price, we can take the worry away when it comes to self assessment tax return

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