Your Exact Net Arrears After Tax
Received an NHS back pay lump sum, or expecting one? This calculator shows exactly what you will actually receive after income tax, National Insurance, pension, and student loan deductions are applied.
The 2026/27 base pay award of 3.3% was paid on time in April 2026 payslips for most England, Wales, and Northern Ireland staff — the first on-time award in six years. However, back pay still arises from several 2026/27 scenarios:
Scotland’s separate deal of 3.75% was also paid in April for most staff, but structural reform back pay applies there too.
Select your back pay type, band, region, and payment month. The calculator applies cumulative PAYE, pension tier bump logic, and correct NI thresholds to show your exact net arrears.
NHS Back Pay Calculator 2026/27 — Arrears, Tax & Net Take-Home
Calculate exactly how much NHS back pay you'll receive after tax, NI and pension deductions. Three scenarios: delayed pay award, promotion arrears, and acting up. 3.3% England/Wales/NI · 3.75% Scotland.
How Back Pay Is Taxed; Cumulative PAYE Matters
When you receive back pay, HMRC does not tax it in isolation or spread it across the months it relates to. It is added to your earnings for the month you actually receive it, and cumulative PAYE is applied based on your total year-to-date earnings.
Example: £500 back pay paid in October (month 7), Band 5 nurse on £32,073:
| Without Back Pay | With Back Pay | |
|---|---|---|
| Monthly earnings (October) | £2,672.75 | £3,172.75 |
| Cumulative earnings (April–Oct) | £18,709.25 | £19,209.25 |
| Personal allowance used (7 months) | £7,332.50 | £7,332.50 |
| Cumulative taxable income | £11,376.75 | £11,876.75 |
| Tax on back pay | — | £100.00 (20% of £500) |
Pension Tier Bump; the Hidden Lump Sum Effect
A back pay lump sum can temporarily push you into a higher NHS pension contribution tier for the payment month. This does not permanently change your tier — it reverts the following month — but it reduces your net arrears more than you might expect.
Example: Band 5 nurse receives 6 months’ regrading arrears in one payslip:
| Normal Month | Payment Month (with arrears) | |
|---|---|---|
| Monthly gross | £2,672.75 | £6,615.75 |
| Annualised for tier | £32,073 → Tier 3 (8.3%) | £79,389 → Tier 5 (10.7%) temporarily |
| Pension deduction | £221.84 | ≈£706.88 |
| Extra pension this month | — | +£40.50 |
What Back Pay Scenarios This Calculator Covers
Band 5 Nurse Regrading (2026/27 Structural Review)
The government committed as part of the 2026/27 pay settlement to fund a review of every Band 5 nurse role in England. Nurses found to be working at Band 6 level are rebanded and receive back pay from 1 April 2026.
Enter the gross arrears total and select “Band regrading / structural review” as your back pay type.
Pay Award Arrears (When Trust Paid Late)
If your trust processed the 3.3% award after April, you are owed arrears from 1 April 2026.
Scotland: 3.75% — enter this rate when Scotland is selected
Wales lowest bands (2–3): may receive 3.8%–5.9% due to the living wage floor — use the actual arrears figure from your payslip
Promotion Backdated Arrears
Enter the salary difference between your old and new band monthly pay and the number of months backdated. The calculator applies the new band’s pension tier rate to the arrears.
Banding Correction / Equal Pay Claim
Back pay from a banding correction is calculated and taxed the same way as a promotion. Enter the total gross arrears.
Overtime, Unsocial Hours and HCAS Arrears
Different pensionability rules apply depending on the type of arrears:
| Pay award (basic pay) | ✅ Pensionable |
| Banding correction/promotion | ✅ Pensionable |
| Unsocial hours arrears | ✅ Pensionable |
| HCAS (London weighting) | ✅ Pensionable (AfC s.2.14) |
| Overtime arrears | ❌ Not pensionable |
Example Back Pay Calculations (2026/27)
Pay Award Arrears — Band 5, England, 3 Months
Promotion Backdated 2 Months — Band 5 → Band 6
Banding Correction 6 Months, Band 5 → Band 6, Paid October (Month 7)
Scotland Band 5 — 3.75% Award Arrears, 3 Months
Note (Scenario 3): the pension tier may temporarily increase for the payment month if the combined gross annualises into a higher tier. The calculator shows this and adjusts the net figure accordingly.
How NHS Back Pay Is Calculated Step by Step
Calculate Gross Arrears
For pay award arrears:
Gross arrears = monthly arrears × months owed
For promotion or banding correction:
Gross arrears = monthly diff × months backdated
For part-time staff: multiply by WTE (contracted hrs ÷ 37.5, or ÷ 36 in Scotland).
Add to the Payment Month’s Earnings
HMRC adds arrears to your normal monthly pay for the payment month. The combined figure determines your tax rate and pension tier for that month.
Apply Cumulative PAYE
Tax is calculated on cumulative year-to-date earnings, including the arrears. If the lump sum pushes cumulative taxable income above the higher rate threshold:
The excess is taxed at 40% (England/Wales) or 42% (Scotland).
Deduct NI on Combined Monthly Gross
NI is calculated on total monthly earnings (normal pay + arrears) using 2026/27 thresholds:
2% above £4,189
Deduct Pension on Pensionable Arrears
Pension is deducted at your applicable tier rate on pensionable back pay. If the combined monthly gross annualises into a higher pension tier, that higher rate applies for the payment month only.
Deduct Student Loan if Applicable
2026/27 thresholds (deductions floored to nearest £1):
Plan 2: £29,385/yr · £2,448.75/mo · 9%
Plan 4: £33,795/yr · £2,816.25/mo · 9%
Plan 5: £25,000/yr · £2,083.33/mo · 9%
Postgrad: £21,000/yr · £1,750.00/mo · 6%
Regional Differences for NHS Back Pay
| Nation | Pay Award | Tax Treatment | Notes |
|---|---|---|---|
| England | 3.3% | UK bands: 20% / 40% / 45% | Higher rate at £50,270 |
| Scotland | 3.75% | Scottish bands: 19%–48% | Higher rate at £31,093, more staff affected by 42% band |
| Wales | 3.3% + living wage floor | UK bands, C-prefix | Lowest bands (2–3) may receive 3.8%–5.9%; use actual payslip figure |
| Northern Ireland | 3.3% | UK bands, no prefix | NI pension tiers, employer rate 23.2% |
Frequently Asked Questions
Everything you need to know about NHS back pay, cumulative PAYE, pension tier bumps, and the 2026/27 award arrears.
For most England, Wales and Northern Ireland staff, no — the 3.3% base award was confirmed in February 2026 and applied in April 2026 payslips on time. However, back pay is still due for Band 5 nurses subject to the regrading review, staff with promotions or banding corrections, trusts that processed payroll late, and any structural reform payments agreed mid-year backdated to April 2026.
No. Back pay is added to your earnings for the month you receive it. HMRC uses cumulative PAYE — a large lump sum can push you into a higher tax band for that month, though the cumulative system usually self-corrects over subsequent months.
Yes, if the total monthly earnings including back pay exceed your plan threshold. The 2026/27 thresholds are: Plan 1 £26,900/yr, Plan 2 £29,385/yr, Plan 4 £33,795/yr, Plan 5 £25,000/yr, Postgraduate £21,000/yr. Deductions are at 9% (6% postgrad) on earnings above the threshold, floored to nearest £1.
Yes. NI is charged at 8% on earnings between £12,570 and £50,270 and 2% above that, calculated in the payment month.
It depends on the type. Pay award arrears, banding corrections, promotion arrears, HCAS arrears and unsocial hours arrears are all pensionable. Overtime arrears are not pensionable. The calculator applies the correct rule per back pay type.
Yes, temporarily. A large lump sum may push your combined monthly gross into a higher NHS pension tier for the payment month only — it reverts the following month. The calculator shows the tier used and adjusts the net accordingly.
The calculator shows a tax band alert. You will pay 40% (England/Wales) or 42% (Scotland) on the portion above the threshold. HMRC’s cumulative system typically corrects any over-deduction over subsequent months.
Scottish AfC staff received 3.75% from April 2026 under a separate two-year deal with the Scottish Government. Select Scotland in the calculator; it applies 3.75% and Scottish tax bands automatically.
As part of the 2026/27 pay settlement, the government committed to fund a review of every Band 5 nurse role in England. If your role is assessed at Band 6 level, you will be rebanded and receive back pay from 1 April 2026. Contact your trust HR or union rep. Use this calculator to estimate your net arrears if confirmed.
The lump sum itself does not increase your pension record. Your higher ongoing salary following a promotion or regrading will increase your future pension accrual from that point forward.
This calculator covers Agenda for Change staff (Bands 2–9). Junior doctor pay falls under DDRB/BMA terms with different calculation rules — speak to your BMA rep.
Very accurate for estimates. We use cumulative PAYE, the correct 2026/27 NI primary threshold (£1,048/month), actual NHS pension tiers with tier bump logic, and HMRC-compliant student loan flooring. Your payslip should match within a few pounds; verify via ESR.
Related NHS Pay Calculators
NHS Take-Home Pay Calculator
Current monthly take-home for any band and region
→ Pay RiseNHS Pay Rise Calculator
See your new take-home after the 3.3% (or 3.75% Scotland) award
→ MaternityNHS Maternity Pay Calculator
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→ Sick PayNHS Sick Pay Calculator
Phases and entitlement based on NHS service under AfC Section 14
→ Part-TimeNHS Part-Time Pay Calculator
Pro-rata pay with WTE calculated correctly (36 hrs Scotland)
→ ScotlandNHS Scotland Pay Calculator
Scottish tax bands, 9 pension tiers, 36-hour week
→ LondonNHS London Pay Calculator
HCAS all four zones, correctly treated as pensionable
→ PensionNHS Pension Calculator
Employer 23.7% contribution and your accrual record
→Updated 2026/27 | Cumulative PAYE · NHS pension tier bump logic · HMRC-compliant student loan flooring | For AfC staff Bands 2–9 — confirm figures with trust payroll or ESR