Pro-Rata Salary Calculator
Work out a pro-rata salary and take-home pay for part-time or term-time hours, based on a full-time equivalent figure.
| Annual | Monthly | Weekly | Per working day | Hourly | |
|---|---|---|---|---|---|
| Gross pay | £35,000.00 | £2,916.67 | £673.08 | £134.62 | £17.95 |
| Income Tax | £4,486.00 | £373.83 | £86.27 | £17.25 | £2.30 |
| National Insurance | £1,794.40 | £149.53 | £34.51 | £6.90 | £0.92 |
| Net pay | £28,719.60 | £2,393.30 | £552.30 | £110.46 | £14.73 |
Income Tax breakdown
- 20% band £22,430.00 taxed → £4,486.00
How pro-rata salary is calculated
Pro-rata means "in proportion" — a pro-rata salary scales a full-time equivalent (FTE) figure down to match how much of a full working pattern you actually work. The calculation multiplies your FTE salary by two fractions: the days you work each week divided by a full-time week (usually 5 days), and the weeks you work each year divided by a full working year (usually 52 weeks). Someone working 3 days a week on a £35,000 FTE salary gets 3/5 × 52/52 = 0.6 of that figure, or £21,000 a year. Multiply the two fractions together and you get one factor that covers both part-time days and part-year working at once.
Term-time-only work
Some roles — school support staff and some public-sector jobs, for example — aren't part-time by days but by weeks: a full 5-day week during term time, with no pay over the school holidays. That's handled by the same formula, just changing which fraction moves. Working 5 days a week for 39 weeks a year instead of 52 gives a factor of 5/5 × 39/52 = 0.75, so a £30,000 FTE role pays £22,500 a year. Enter your normal full-time days per week alongside the actual weeks you're paid for to model this correctly — don't try to squeeze term-time working into the "days per week" field on its own.
Tax and National Insurance on a pro-rata salary
Once your pro-rata gross salary is worked out, it's taxed exactly like any other salary of that size — there's no separate part-time tax treatment. You still get the full £12,570 tax-free Personal Allowance for 2026/27 regardless of how many days or weeks you work, so a lower pro-rata salary usually means proportionally less tax, not just less pay. This calculator applies the same PAYE Income Tax bands, National Insurance thresholds, pension treatment, and student loan rules used across the rest of the site to your pro-rata figure.
Pro-rata pay and pro-rata holiday entitlement
Statutory holiday entitlement is pro-rated separately from pay, using a similar but distinct calculation — typically days-per-week × 5.6 weeks, capped at 28 days. A part-time worker's holiday allowance isn't derived from their pro-rata salary directly; it comes from their own days/hours pattern. See our dedicated holiday entitlement calculator if you need that figure alongside your pro-rata pay.
Comparing to the full-time equivalent
The salary you enter above is always the full-time equivalent (FTE) — the figure quoted in a job advert or used for pay-scale comparisons — not the amount that actually lands in your account. If you want to see the full take-home breakdown for that FTE figure as if you worked it full-time, try the main UK take-home pay calculator with the same salary and no pro-rata adjustment.
Frequently asked questions
How is pro-rata salary calculated?
Take the full-time equivalent (FTE) salary and multiply it by two fractions: the days you actually work divided by full-time days (usually 5), and the weeks you work per year divided by 52. For example, working 3 days a week on a £35,000 FTE salary gives 3/5 × 52/52 = 0.6, so £21,000 a year.
Is pro-rata pay based on my gross or net salary?
Pro-rata is applied to the gross (before-tax) salary. Your Income Tax, National Insurance, pension, and student loan deductions are then calculated on that reduced pro-rata gross figure, exactly as they would be for anyone earning that amount full-time — this calculator shows both.
How do I work out pro-rata pay for term-time-only jobs?
Term-time roles (common in schools) use the "weeks per year" part of the formula rather than reduced days. If you work 5 days a week but only 39 weeks a year instead of 52, your factor is 5/5 × 39/52 = 0.75. Enter your normal full-time days per week and set "weeks worked per year" to 39 to model this.
Does pro-rata affect my Personal Allowance?
No. Everyone gets the same £12,570 tax-free Personal Allowance for 2026/27 regardless of how many days or weeks they work — it isn't pro-rated. Working part-time simply means less of your income falls above that allowance, so you pay less tax in absolute terms.
Does pro-rata salary affect my holiday entitlement too?
Yes, separately from pay — statutory holiday entitlement is also pro-rated for part-time workers, usually as days-per-week × 5.6 weeks. Pay and holiday use similar proportional logic, but they're calculated independently; see our holiday entitlement calculator for the leave-specific version.