HM Revenue and Customs (HMRC) must receive your tax return and any money you owe by the deadline.
The last tax year started on 6 April 2015 and ended on 5 April 2016.
|Online tax returns||Midnight 31 January 2017|
|Pay the tax you owe||Midnight 31 January 2017|
There’s an additional payment deadline of 31 July if you make advance payments towards your bill (known as ‘payments on account’).
You’ll usually pay a penalty if you’re late. You can appeal against a penalty if you have a reasonable excuse.
When the deadline is different
Submit your online return by 30 December if you want HMRC to automatically collect tax you owe from your wages and pension. You must be eligible.
HMRC must receive a paper tax return by 31 January if you’re a trustee of a registered pension scheme or a non-resident company. You can’t send a return online.
HMRC might also email or write to you giving you a different deadline.
2014 to 2015 tax year and earlier
The Self Assessment deadline for these tax years has passed. Send your tax return or payment as soon as possible – you’ll have to pay a penalty.
You’ll get a penalty if you need to send a tax return and you miss the deadline for submitting it or paying your bill.
You’ll get a penalty of £100 if your tax return is up to 3 months late. You’ll have to pay more if it’s later, or if you pay your tax bill late.
Estimate your penalty for Self Assessment tax returns more than 3 months late, and late payments.
You can appeal against a penalty if you have a reasonable excuse.
How to get help
If you need help with Self Assessment, you can:
- appoint someone to fill in and send your tax return, for example an accountant, friend or relative – you can find an accountant accredited in the UK
- watch videos and join online seminars
- contact HM Revenue and Customs (HMRC) for general Self Assessment enquiries
- get help with your online account