When the NHS pay rise is implemented after its 1 April effective date, you're owed the difference for every month you were paid at the old rate. Here's how back pay works, what you'll actually receive after tax, and common pitfalls to watch for.
What Is NHS Back Pay?
NHS back pay (arrears) is the difference between your old salary rate and the new rate for each month between the effective date (1 April 2026) and the month your trust implements the new rate in payroll. If your trust implements in June 2026, you're owed two months of arrears (April and May).
Back pay is not a bonus — it's salary you've already earned but not yet received. It's fully taxable and subject to all the usual deductions including National Insurance, pension contributions, and student loan repayments.
Back Pay Example — Band 5 Entry (4-Month Delay)
If implementation is delayed until August 2026 (4 months of arrears):
| Month | Old Monthly | New Monthly | Difference |
|---|---|---|---|
| April 2026 | £2,587 | £2,673 | +£85 |
| May 2026 | £2,587 | £2,673 | +£85 |
| June 2026 | £2,587 | £2,673 | +£85 |
| July 2026 | £2,587 | £2,673 | +£85 |
| Total Gross Arrears | £341 | ||
| Less: Tax (20%) | -£68 | ||
| Less: NI (8%) | -£27 | ||
| Less: Pension (8.3%) | -£28 | ||
| Net Back Pay | ~£218 |
Band 5 entry 4-month gross arrears of ~£341, netting to approximately £218–£221 after deductions.
Back Pay by Band — 4-Month Delay Scenario
| Band | Monthly Difference | 4-Month Gross Arrears | ~Net After Deductions |
|---|---|---|---|
| Band 2 | £67 | £269 | ~£173 |
| Band 3 | £69 | £274 | ~£176 |
| Band 4 | £76 | £302 | ~£194 |
| Band 5 | £85 | £341 | ~£221 |
| Band 6 | £106 | £425 | ~£264 |
| Band 7 | £131 | £526 | ~£263 |
| Band 8a | £153 | £613 | ~£283 |
⚠️Tax Spike Month — All back pay is taxed in the month it's paid, not spread across the months it was earned. If 4 months of arrears arrive in August, your August payslip will show a much higher gross — and deductions will spike accordingly. HMRC's cumulative PAYE system should balance this by year-end.
Part-Time Staff Back Pay
If you work part-time, your back pay is pro-rated to your contracted hours (WTE). A Band 5 nurse working 0.6 WTE (22.5 hours/week) would receive 60% of the full-time arrears.
Example: 4 months × £85 × 0.6 WTE = £204 gross → approximately £132 net.
If your contracted hours changed during the back pay period (e.g., you increased from 0.6 to 0.8 WTE in June), each month's arrears should be calculated using the WTE applicable for that specific month.
What If You Left the NHS Before Back Pay Was Processed?
You're still entitled to back pay for every day you worked at the old rate. Your former trust must process your arrears and either:
1. Pay it through their payroll system (most common)
2. Issue a manual payment via BACS
Contact your former trust's payroll department. Keep copies of your final payslip showing your leaving date and pay point. If you don't receive a response within 30 days, escalate through your union or ACAS.
Back Pay and Your Pension
Back pay is pensionable — meaning pension contributions are deducted from it, but it also counts toward your pension accrual for the year. This is actually beneficial: your 2026/27 pension accrual will be based on your full new salary (not the old rate), even for the months before implementation.
Under the 2015 CARE scheme, your pension builds at 1/54th of your pensionable pay each year. The 3.3% increase means 1/54th of £32,073 = £594 for Band 5 (vs. £575 based on the old salary).
Student Loan Deductions on Back Pay
Student loan repayments are calculated on your total monthly earnings. A lump sum of back pay can trigger higher deductions in that month:
• Plan 1: 9% of everything above £22,015/year (£1,834/month)
• Plan 2: 9% of everything above £27,295/year (£2,274/month)
• Plan 5: 9% of everything above £25,000/year (£2,083/month)
These over-deductions should self-correct through the Student Loans Company's annual reconciliation, but it may take until the following April.