Despite the deadline being ten months after the end of the tax year, nearly one million people failed to file their tax returns on time. Those people will now be faced with a £100 late filing penalty and may face further penalties if they continue to delay their submission. 

But there will also be many people who, seeing the deadline fast approaching, threw their tax returns together at the last minute. Reviewing their work now that the deadline has passed, some will discover that they have made a mistake. Fortunately there is still a chance to rectify matters if this applies to you. You simply need to submit an amended tax return. 

The deadline for amending your tax return is twelve months from the final filing deadline. This means that you have until 31st January 2021 to fix an erroneous 2018/19 tax return. How you make the amendment will depend on how you filed your original return.

If you used software to file the return, this will usually include an option to file an amended return. You should consult your software supplier if you cannot find this option. 

If you filed online through your personal tax account then you need to login to your account and follow the steps below. 

• From ‘Your tax account’, choose ‘Self Assessment account’ (if you do not see this, skip this step).
• Choose ‘More Self Assessment details’.
• Choose ‘At a glance’ from the left-hand menu.
• Choose ‘Tax return options’.
• Choose the tax year for the return you want to amend.
• Go into the tax return, make the corrections and file it again.

If you filed on paper, you only need to send in the pages of the return that need amending. You should write “Amended” on each page you send in and ensure that your name and UTR are included with your submission. You can download a copy of the 2018/19 return from here. tinyurl.com/PaperReturn. The completed pages should be sent to: 

Self Assessment
HM Revenue & Customs
BX9 1AS

When amending a return you need to be aware of two things. HMRC normally only have twelve months from the filing deadline to enquire into a return. Where an amendment is filed, that is extended to twelve months from when the amendment was made. Also, whilst an amended return will not attract a late filing penalty, any additional tax due will be subject to interest from the normal payment due date of 31st January. 


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