Pro Rata Salary Calculator 2026/27
Turn a full-time salary into your part-time pay, then see your take-home after tax and NI and your pro-rata holiday.
Last updated: October 2026 · 2026/27 rates
Your job
The salary the job would pay if you worked full-time.
Used to show your holiday in days.
Pro-rata salary (60% of full-time)
£18,000.00/year
Take-home after tax and NI: £16,479.60 a year, £1,373.30 a month.
Take-home pay, per year
| Gross pro-rata pay | £18,000.00 |
| Income tax (England, Wales and NI) | -£1,086.00 |
| National Insurance | -£434.40 |
| Take-home pay | £16,479.60 |
Pro-rata holiday entitlement
5.6 weeks of your working week: 126 hours or 16.8 days. Work out other patterns with the holiday entitlement calculator.
How it works
Pro rata means "in proportion". A job advertised at £30,000 pro rata pays £30,000 only if you work the full-time hours. Work fewer hours and you get the same share of the salary: your hours divided by the full-time hours, times the full-time equivalent (FTE) salary.
Worked example. A £30,000 FTE job with a 37.5-hour full-time week, worked at 22.5 hours: 22.5 / 37.5 = 60%, so the pro-rata salary is £18,000 a year, £1,500.00 a month. The hourly rate is unchanged at £15.38, because part-time workers must not be paid less per hour than comparable full-timers.
On £18,000 in England, Wales or Northern Ireland, income tax is (£18,000 minus the £12,570 Personal Allowance) x 20% = £1,086.00, and National Insurance is (£18,000 minus the £12,570 threshold) x 8% = £434.40. Take-home is £16,479.60 a year. Going part-time cuts take-home by less than it cuts gross pay, because the tax-free allowance and NI threshold do not shrink with your hours.
If you only know an hourly rate, the hourly to annual salary calculator converts it, and the salary calculator gives a full payslip view with tax codes.
Many part-time contracts are written in days: "four days a week" rather than 30 hours. If your days are the same length as a full-timer's, the ratio is your days over the full-time days. A £42,000 FTE role worked four days out of five is 80% FTE, or £33,600 a year.
If your days are shorter or longer than standard, use hours, which is what your employer's payroll will normally do. Compressed hours (full-time hours in fewer days) still count as full-time.
Related calculators
Other free UK tools that follow on from this calculation.
Salary Calculator
Annual, monthly and weekly take-home pay after PAYE, NI, pension and student loan.
Hourly to Annual Calculator
Convert any hourly rate to weekly, monthly and annual gross pay using UK working-hour defaults.
Holiday Entitlement Calculator
Statutory paid holiday in days or hours for part-time, shifts, irregular hours and mid-year starters.
Student Loan Calculator
Monthly repayments for Plan 1, 2, 4, 5 and Postgraduate at the latest HMRC thresholds.
Reviewed by Alexandre Bernier, LLM (UK), CFP®
Educational tool: estimates only. Not individual financial, investment, tax or legal advice. Using it does not create an adviser-client relationship. Rules and figures change; check them against current HMRC and GOV.UK guidance and speak to a qualified professional. Editorial policy →
Sources
Every rate and threshold used by this calculator is taken from the official pages below. If a figure here disagrees with one of these, the official page is right, please tell us.
- HMRC: Income Tax rates and Personal Allowances
- Scottish Government: Scottish Income Tax rates and bands
- HMRC: National Insurance rates and categories
- GOV.UK: Repaying your student loan, what you pay
- GOV.UK: National Minimum Wage and National Living Wage rates
- GOV.UK: Holiday entitlement
- GOV.UK: Part-time workers' rights