What's Left, step 1 of 7: What will I take home?
Pro-rata salary calculator
Work out your salary and take-home pay for part-time or reduced hours.
You'll take home about
£1,553
a month. That's about £358 a week, or £18,640 a year, from £21,000 a year before tax.
Where your money goes
- Income Tax£141 a monthYou pay no tax on the first £12,570 a year, your tax-free allowance. Above that, most pay is taxed at 20%.
- National Insurance£56 a month8% of what you earn between £12,570 and £50,270 a year, and 2% above that. It builds your State Pension.
If you earned £1,000 more a year, you would keep about £720 of it, or 72p of every extra £1.
If your hours or pay rate look wrong, ask your employer's payroll team. If your tax code looks wrong, HMRC sets it: check it in the HMRC app or on GOV.UK. Have your latest payslip and your P45 or P60 to hand.
See every line
Your full breakdown
| Item | Year | Month |
|---|---|---|
| Pro-rata salary | £21,000.00 | £1,750.00 |
| Income Tax | £1,686.00 | £140.50 |
| National Insurance | £674.40 | £56.20 |
| Take-home pay | £18,639.60 | £1,553.30 |
This is an estimate. Your payslip can be a little different because of how your employer rounds figures or when deductions are taken. We've assumed 2026/27 rates for England, Wales and Northern Ireland, a standard tax code, no pension and no student loan; change these under More options.
Why your payslip might differ
Your payslip can be different from this if:
- your tax code isn't 1257L (check the code on your payslip);
- you pay into a pension or repay a student loan (add them under More options);
- you started or changed job this tax year, and you're on an emergency code;
- this month included a bonus or overtime;
- you have more than one job;
- you live in Scotland, where the tax rates are different.
For hours or pay, ask your payroll team. For a tax code, ask HMRC. Why is my pay different this month?
How pro-rata pay is worked out
Pro-rata pay is the full-time salary × your hours ÷ full-time hours: £35,000 × 22.5 ÷ 37.5 = £21,000.
Holiday entitlement is pro-rated in the same way, but your hourly rate stays the same as a full-time colleague's.
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These results are an estimate, not financial advice. They use the 2026/27 rates in force on 24 October 2026 and the inputs shown, so your actual tax, pay or costs may differ. Before making a decision about your money, check the figures with HMRC or your provider, or speak to a regulated financial adviser. Free, impartial guidance is available from MoneyHelper.
This page explains the rules using the 2026/27 rates in force on 24 October 2026. It is general information, not financial advice. For decisions about your own money, speak to a regulated financial adviser, or get free, impartial guidance from MoneyHelper.