The UK tax year runs from 6th April to the 5th April the next year. Here are the HMRC deadlines for filing your 2014/2015 tax return:
If your payments on account don't cover this years tax bill then any outstanding tax that you have due must be paid by the following date:
Payments on Account
If you had more than £1,000 of tax to pay and less than 80% of your other tax liabilities was deducted at source then you will have to make payments on account for your 2015/2016 tax return.
If you are late at filing your paper or your online tax return, HMRC have set fines that you will have to pay. For example if you filed your online tax return on the 1st June 2016 then you would pay £420 in fines!
If you are late at paying your tax bill, HMRC have set penalties that you will have to pay if they haven't received payment by these dates:
The UK is the only country in the world that has a tax year of the 6th April of one year to the 5th April of the next year. The story of this goes back to the year 1582 when Pope Gregory Xiii decided to change the current Julian Calendar to what is now known as the Gregorian calendar. This was due to the calendar after being around for 1600 years causing the date to be 10 days behind the solar calendar.
This was changed all around Europe but the British Empire held out until 1752 which meant that they were 11 days behind everyone else. In September 1752 the date went from the 2nd September to the 14th September to bring it in line with everyone else. The tax year used to start on the 25th March of each year. The treasury didn’t want to lose 11 days tax revenue so pushed the tax year back to start on the 5th April of each year. In the year 1800 due to how the Gregorian Calendar works they were due to lose a day in tax revenue so pushed the start day to the 6th April and it has stayed there ever since!