Self-assessment e-filing deadline

Source: HM Revenue & Customs | | 03/10/2017

As existing self-assessment tax filers will be aware, the deadline for online submission of your 2016-17 self-assessment tax return is 31 January 2018. This is also the date that the payment is due for the balance of any self-assessment liability for 2016-17, and the due date for any payment on account due for the current 2017-18 tax year.

There are penalties for late self-assessment returns including an automatic £100 penalty for submitting a late return even if there was no tax to pay or the tax due was paid on time.

The following additional penalties apply to self-assessment returns that are filed late:

  • From 3 months late: taxpayers will be charged an automatic daily penalty of £10 per day up to a £900 maximum.
  • From 6 months late: taxpayers will be charged additional penalties which are the greater of 5% of tax due or £300.
  • Over 12 months late: there are additional penalties based on greater of 5% of tax due or £300. In serious cases this penalty may be increased up to 100% of tax due.

If you are struggling to meet the 31 January 2018 filing deadline we can help.

Planning note

The filing deadline for taxpayers with certain underpayments in the 2016-17 tax year, and who want to apply to have tax collected through their tax code (in 2018-19), is even earlier - 30 December 2017.

Completing your 2017 tax return will also ensure that you know how much you will need to pay HMRC at the end of January 2018.



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