Pro rata salary and take-home calculator (2026/27)
Compare full-time salary with a regular part-time weekly-hours arrangement.
Enter your figures
2026/27 estimate for England, Wales or Northern Ireland. Check the scope and assumptions below.
- Equivalent annual gross pay
- £21,000.00
- Annual Income Tax
- £1,686.00
- Annual employee NI
- £674.40
- Estimated annual take-home
- £18,639.60
- Estimated monthly equivalent
- £1,553.30
What this estimate includes
The hours-based calculation assumes the same hourly contractual rate and the same paid weeks across full-time and part-time work. It excludes term-time holiday-pay calculations, overtime, irregular-hours accrual, pension and student loans.
Method and assumptions
Annual pro rata gross pay = full-time annual salary × your weekly hours ÷ full-time weekly hours. The tool then applies standard annual England/Wales/Northern Ireland tax and employee NI, rather than multiplying full-time net pay by the hours fraction.
Read the related explanation and check the next steps.
Sources and review
AfterTaxUK Editorial Team · reviewed 22 October 2026. A review date is separate from live deployment. Check your own records and current official guidance for individual decisions.
Frequently Asked Questions
Clear answers based on official HMRC rules and statutory guidance.
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Visit Blog HubAnnual employment estimate
Use the stated tax code and gross pay to compare employment deductions in England, Wales and Northern Ireland. Monthly, weekly and daily figures divide an annual result; they do not reconstruct cumulative payroll.
The main pension input models salary sacrifice. Irregular pay, benefits in kind, multiple employments and a different pension method can change a real payslip. Use the Scottish tool for Scottish employment income.
Check the rules for your circumstances
Official guidance supports the rules described here; it does not approve or certify this calculator. Confirm dates, eligibility and unsupported cases before making a financial decision.