Civil Service arrears calculator

UK Civil Service Pay Rise & Back Pay Calculator

Model a departmental award, count complete back-pay months and compare gross arrears with estimated take-home arrears after tax, NI and pension.

UK inputs only

GBP · gross and estimated net arrears

Model a pay rise and back pay

Enter the award percentage and dates. The tool compares 2026/27 tax, NI, Alpha pension and student-loan deductions before and after the rise.

Current annual base salary£Pay rise%Annual pensionable location allowance£This estimate treats the amount entered here as pensionable pay.Income Tax regionAward effective dateFirst revised payment dateCivil Service pensionStudent loan plan

3 whole back-pay months

Revised annual base salary£36,750£79 estimated net increase per month

Annual gross increase: £1,750
Monthly gross increase: £146
Current monthly take-home: £2,286
Revised monthly take-home: £2,365
Gross back pay: £438
Estimated net back pay: £236

Back pay counts complete calendar months between the two dates. Mid-month effective dates, payroll rounding, one-off tax effects and department-specific award rules can change the payslip amount. The entered location allowance is treated as pensionable pay.

Calculation scope

What this United Kingdom calculator covers

Rules: 2026/27 tax year · verified 13 July 2026

Revised salary

Applies the entered percentage to current annual base salary and keeps location allowance separate.

Gross arrears

Counts complete calendar months between the effective and payment dates.

Estimated net arrears

Compares 2026/27 Income Tax, NI, Alpha pension and student-loan effects before and after the rise.

Primary references

Official United Kingdom sources

Civil Service Pay Remit Guidance 2026 to 2027Government pay-remit framework; individual departmental awards can differ.HMRC rates and thresholds 2026 to 2027Tax, National Insurance and student-loan thresholds used for the net comparison.