Pro-rata Salary Calculator added

For a very long time, people have been asking me to add a pro-rata tax calculator to The Salary Calculator – I have finally created it and added it to the site. As I have mentioned in an earlier post, pro-rata salary is normally calculated quite easily. For reduced hours, most employers will multiply the full-time salary by the reduced number of hours divided by the full-time hours.

For example, if the full-time salary is £20,000 per year for 37.5 hours’ work per week, the pro-rata salary based on a 18-hour working week would be:

£20,000 x (18 / 37.5) = £9,600

Income tax, National Insurance and other deductions are then calculated based on this new salary. To use this new tool, you just need to enter the full-time salary, the full-time hours, and the new hours that the pro-rata salary is to be calculated from. To check it out for yourself, get started with the pro rata Salary Calculator.

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Pro-rata calculations

Recently, I’ve had a couple of requests from users of the site to have a pro-rata calculator on the site, so you can work out what your new pay would be if you go down to reduced hours or enter a job share of some sort. Unfortunately, I’ve not had time to make this new tool, but it is easy to use the existing calculator to work out your pro-rata pay.

For example, if you are working 20 hours a week instead of 37.5:

  1. If you know the hourly rate for the job, use the Hourly Rate Calculator, enter that rate and 20 hours – the calculator will show you the take home pay.
  2. If you just know the annual salary for 37.5 hours a week, first divide the salary by 37.5, then multiply it by 20. Enter this new salary into the normal calculator and it should give you the right information.

According to HMRC, tax, NI etc are all worked out the same whether you worked 37.5 hours to earn the money, or just 20 (or 1!). The above tricks can show you what you need to know until I have time to create a pro-rata calculator.

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