UK Salary Sacrifice Pension Calculator 2026
Estimate the income tax and National Insurance savings from a UK salary sacrifice pension arrangement for 2026/27. Includes employee NI saved (8% main rate / 2% higher band), employer NI saved (15% from April 2025), and any rebate your employer passes back into your pension. Free, private, runs entirely in your browser.
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Source: HMRC — Salary sacrifice and the effects on PAYE + UK Spring Budget 2026. Last updated: May 3, 2026.
What Is Salary Sacrifice for Pension Contributions in the UK?
Salary sacrifice (also called "salary exchange") is a HMRC-recognised arrangement in which you formally agree to give up part of your gross salary in return for an equivalent contribution paid into your workplace pension by your employer. Because the foregone salary is no longer paid to you, it does not appear on your payslip as taxable income. This means you save income tax, employee National Insurance, and your employer also saves their employer NI on the sacrificed amount. Source: HMRC — Salary sacrifice and the effects on PAYE.
Salary sacrifice differs from a standard "relief at source" pension contribution in two important ways. First, it removes employee National Insurance from the equation — under standard relief at source, you pay 8% NI on the contribution before it leaves your paycheque. Second, it generates an employer National Insurance saving (15% in 2026/27 since the rate increase from 13.8% in April 2025), which many employers choose to pass back into your pension, materially boosting your retirement pot at no additional cost to either party.
How the 2026/27 NI and Tax Rates Affect Your Saving
For tax year 2026/27, the relevant rates used by this calculator are:
- Income tax (rUK): 0% on the £12,570 personal allowance, 20% basic up to £50,270, 40% higher up to £125,140, 45% additional above. The personal allowance tapers by £1 for every £2 of income above £100,000.
- Income tax (Scotland): 19% starter, 20% basic, 21% intermediate, 42% higher, 45% advanced, 48% top — verify exact thresholds with the Scottish Government 2026/27 Budget.
- Employee NI (Class 1): 8% on earnings between the primary threshold (£12,570) and the upper earnings limit (£50,270), 2% above. The main rate was reduced from 12% to 10% from January 2024 and to 8% from April 2024 — the 8% rate continues for 2026/27.
- Employer NI (Class 1): 15% above the secondary threshold of £5,000 (effective from 6 April 2025, confirmed in Spring Budget 2026).
For a basic-rate taxpayer earning £40,000 who sacrifices £5,000 into their pension, the annual saving is £1,000 income tax + £400 employee NI = £1,400. The take-home reduction is only £3,600 (not the full £5,000), but the pension receives the full £5,000 — plus any employer NI rebate. For a higher-rate taxpayer (40% income tax + 2% NI on the sacrificed amount), the saving is £2,100 on the same £5,000 sacrifice.
Employer NI Rebate — A Critical Variable
The UK 2024 Autumn Budget raised employer NI from 13.8% to 15% from 6 April 2025, increasing the saving employers generate when employees sacrifice salary. Many employers pass back 50%–100% of this 15% saving into the employee's pension. This is a powerful free boost — if you sacrifice £6,000 and your employer passes back 100% of their 15% NI saving (£900), your pension actually receives £6,900. Always check your employer's policy: some pass back 100%, some 50%, some 0%.
The employer NI rebate is the single biggest differentiator between salary sacrifice and ordinary "relief at source" contributions. On a higher-rate taxpayer salary of £100,000 with a £10,000 sacrifice and a 100% employer NI rebate, the combined annual benefit can exceed £5,800 vs an ordinary contribution.
When Salary Sacrifice Might Not Be Right for You
Salary sacrifice is not suitable for everyone. The reduced gross salary affects life cover, mortgage borrowing, statutory maternity/paternity pay, and any benefit calculated on gross earnings. Most large employers ring-fence "notional" salary for these purposes, but smaller employers may not. Always confirm with payroll before signing the agreement.
Additionally, salary sacrifice cannot reduce your gross salary below the National Living Wage. If your sacrifice would breach this floor, your employer will refuse the arrangement. The annual allowance (£60,000 in 2025/26) and the tapered annual allowance for high earners still apply — verify your total contributions including employer pass-back stay within the limit. Last updated: 3 May 2026.