NHS Backpay Calculator — How to Check If You're Owed Arrears After the Pay Award

NHS pay awards are agreed nationally through the Pay Review Body process and then applied to payrolls. When there are delays between the award date (typically 1 April) and when payroll systems are updated, arrears accumulate and should be paid as back pay. Here's how to check your entitlement.

How Back Pay Works

If the 2026/27 pay award (effective 1 April 2026) wasn't applied to your April payslip, any months where you were paid at the old rate generate arrears. Your employer should automatically calculate and pay these arrears once the new rates are processed — usually within 1–2 pay periods of the award date.

Checking Your Back Pay Calculation

1. Find your "old" band minimum/maximum for 2025/26
2. Find your "new" band rate for 2026/27 (after the 3.3% uplift)
3. Multiply the monthly difference by the number of months you were paid at the old rate
4. This is your gross back pay. Expect around 68–72% of this to reach you after tax and NI

Pension Implications of Back Pay

Back pay is pensionable under the NHS Pension Scheme. The pension contributions in the month(s) the back pay arrives may be higher than usual because they're calculated on the bumped-up monthly payment.

Holiday Pay and Overtime in Back Pay

If your pay award changes your base hourly rate, any holiday you took during the period of the arrears should also be recalculated at the higher rate. This is technically your employer's obligation, though in practice it's often missed for minor calculations.

Frequently Asked Questions

My payslip shows a "back pay" line that's much lower than I expected. Why?

Back pay is taxed as income in the month it's received. A large lump sum arriving in one month can push you into a temporarily higher tax rate for that month — though the cumulative PAYE system should balance this out over the year. If the figure still doesn't make sense, check with your payroll department.

I worked bank shifts during the arrears period — are those back-paid too?

Bank shifts paid at your substantive rate should also be uprated. However, bank shifts are often processed separately and the back pay calculation can be complex. Check with your bank bureau or trust payroll team specifically about bank arrears.

Use our NHS Backpay Calculator to estimate your entitlement.