What are the deadlines for Self Assessment tax returns?

In the UK, the tax year runs from 6 April to 5 April (in the following year) and here are some important dates:

31 January

Before midnight on 31 January:

  • File your tax return online. There will be a penalty if you miss this dateline even if you have no tax to pay or have already paid the tax that you owe.
  • Pay any tax you owe for the previous tax year.
  • Pay your first payment on account i.e advance payments towards your tax bill if you are self-employed.
  • Pay your balancing payment if you still have tax to pay after you’ve made your payments on account.
  • Amend the past tax return when you realise that an entry is incorrect.

What our clients say...

I’ve found out more from you today than in all the time I was with my previous accountant!

James Wilson, James Wilson Interiors Ltd