SalarySense

Pro rata salary calculator

Your hours, your actual pay — the full-time salary scaled to what you work, then taken through tax, NI and student loans at 2026/27 rates.

Where do you pay tax?
Student loan, pension & Marriage Allowance
Student loan plans

Undergraduate plans deduct alongside a postgraduate loan. Scotland collects postgraduate loans within Plan 4; Northern Ireland collects them as Plan 1.

Pension

Salary sacrifice reduces income tax, NI and student-loan deductions. Relief at source doesn't change PAYE: your cash outlay is 80% of the gross contribution, and higher-rate taxpayers reclaim the rest from HMRC.

Your pro-rata salary: £22,800

£1,661.30 / month

£19,936 a year take-home · £383.38 a week

  • You keep£19,936
  • Income tax£2,046
  • National Insurance£818
  • Student loan£0
  • Pension£0
  • Income tax£2,046.00
  • National Insurance£818.40
  • Student loan£0.00
  • Pension (your outlay)£0.00

Take-home by pay period

Take-home by pay period (37.5-hour, 5-day week for the daily and hourly views)
PeriodTake-home
Yearly£19,936
Monthly£1,661.30
Every 4 weeks£1,533.51
Weekly£383.38
Daily£76.68
Hourly£10.22

How pro rata is worked out

Pro-rata salary = full-time salary × your hours ÷ full-time hours. £38,000 at 22.5 of 37.5 hours is £22,800. Tax is then calculated on your actual salary — the personal allowance is not reduced for part-time work, which is why part-time take-home is proportionally higher than full-time take-home.

Income tax band by band. Bands apply to taxable income — what's left after your £12,570 personal allowance.
Band (taxable income)Amount in bandRateTax
£0 – £37,700£10,23020%£2,046.00
Total income tax£2,046.00

Questions people ask

How do I calculate a pro rata salary?

Divide the full-time salary by the full-time weekly hours, then multiply by the hours you actually work. £38,000 over 37.5 hours is £1,013.33 per weekly hour, so 22.5 hours is £22,800 a year.

Do I pay proportionally less tax part-time?

You pay less than proportionally. Your personal allowance (£12,570) stays whole however few hours you work, so it shelters a bigger share of a part-time salary — take-home per hour is higher part-time.

What about term-time or part-year contracts?

Employers usually convert term-time contracts to an annualised salary with the same formula applied to weeks instead of hours. If you know your annualised figure, put it straight into the salary calculator on the homepage.

Does holiday entitlement change the calculation?

No — statutory holiday accrues pro rata too, and salaried part-timers' pay already includes it. The calculation here matches what payroll does to your contractual salary.