How is the tax during tax year in the United Kingdom calculated?

UK Tax year is always from the 6th of April to the 5th of April, unlike a tax year we are used to in most of the countries, from 1st of January to the 31st of December.

This makes it a bit tricky when trying to calculate your taxes. Here is how it breaks down for the following years:

From To
2016.04.06 2017.04.05
2017.04.06 2018.04.05
2018.04.06 2019.04.05
2019.04.06 2020.04.05

The earning document P60 always shows the ending date, for example, "Tax year to 5 April 2018". It means it is about the tax year of 2017/2018 and you need to use the NeoTax calculator of 2017.

The P45 always has a "Leaving date" field. For example, 12.03.2019. In this case, the tax year would be 2018.04.06 - 2019.04.05 using the NeoTax calculator of 2018.

Check how much you can refund from the U.K. in free online calculator on

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