Salary Sacrifice for Pensions — How It Works 2026/27

Written by James Whitfield · Updated August 2026 · Checked against 2026/27 HMRC rates.

Pension salary sacrifice is a formal arrangement where you reduce your gross salary and your employer makes an equivalent (or greater) pension contribution in your place.¹ Because your gross salary falls, you pay less income tax and National Insurance on the sacrificed amount. You end up with a larger pension contribution for less net cost than a standard employee contribution under relief at source.

How it works mechanically

Under a standard pension contribution (relief at source), you pay from net salary and the provider claims 20% tax relief from HMRC. You still pay National Insurance on your full gross. Under salary sacrifice:

• Your contractual gross salary is formally reduced.
• Your employer makes the pension contribution in your place — it becomes an employer contribution.
• Income tax is calculated on your lower salary — you save income tax at your marginal rate.
• Employee NI is also calculated on your lower salary — you save 8% (or 2% above £50,270) on the sacrificed amount.
• Employer NI is calculated on the lower salary — your employer saves 15% on the sacrificed amount.

The pension contribution is the same size. The key difference is that it is classified as an employer contribution rather than an employee one. That is what unlocks the NI saving.

Worked example: £35,000 salary, £2,000 annual sacrifice

An employee earning £35,000 sacrifices £2,000 a year into their pension. All of it sits in the basic-rate income tax band and the main 8% NI band,³⁴ so the maths is clean:

Plus: your employer saves 15% × £2,000 = £300 in employer NI,³ which many schemes add to your pension on top.

The same £2,000 under relief at source saves only the £400 income tax — no NI. So sacrifice puts the identical £2,000 in your pension but costs you £160 less each year. That gap is pure NI, and it widens if your employer shares their £300.

Employer NI sharing

Your employer saves 15% employer NI on every pound you sacrifice. On a £2,000 sacrifice that is £300. Many employers pass some or all of this back into your pension. If yours passes back 100%, your pension receives £2,300 instead of £2,000. An extra £300 at no cost to anyone.

Ask your HR or payroll team directly: "Does the company pass on its employer NI savings from salary sacrifice as additional pension contributions, and if so, what percentage?" This is rarely advertised prominently but is available on request.

The annual allowance still applies

Salary sacrifice contributions count as employer contributions for annual allowance purposes,⁶ but they still count towards your total pension input. The annual allowance for 2026/27 is £60,000, or 100% of earnings if lower.⁵ Employee contributions, employer matching and salary sacrifice all add together.

Most employees are well within the £60,000 limit. It only becomes relevant for higher earners making large sacrifice contributions alongside significant employer matching or defined benefit accrual.

National Minimum Wage is also a constraint. Your post-sacrifice cash salary must not fall below NMW for your age group. For most employees this is not an issue, but low-paid workers or anyone considering large amounts should check first — see the minimum wage guide.

How to opt in via your employer

Salary sacrifice requires a formal amendment to your employment contract. You cannot set it up yourself. The process typically involves:

• Requesting to join the scheme from HR or payroll.
• Signing a salary sacrifice agreement that reduces your contractual salary and specifies the amount and scheme.
• Waiting for the change to take effect — usually at the start of the next payroll period, though some employers process changes only at specific windows (often start of financial year or open enrolment period).
• Checking your first payslip after the change to confirm the reduced salary and the pension contribution are both showing correctly.

Before signing, check your employment contract. Some benefits — life assurance, income protection, statutory maternity pay — are calculated on contractual salary. A lower contractual salary can reduce these. Worth knowing before you agree the sacrifice amount.

If your employer doesn't offer salary sacrifice, raise it with HR. The employer saves NI on every participating employee. That is a real financial incentive for them to introduce a scheme.

Common mistakes to avoid

• Sacrificing below minimum wage. Your remaining cash pay must stay at or above the National Minimum Wage for your age — payroll will usually block a sacrifice that breaches it, but part-time and lower-paid workers should check before agreeing an amount.¹
• Forgetting the mortgage effect. Some lenders assess your reduced contractual salary, not your gross. If you're applying soon, it can be worth timing the sacrifice around the application.
• Assuming the employer NI saving is automatic. The 15% is the employer's to keep unless your scheme rules say otherwise — always ask whether it's shared.³
• Ignoring the £100,000 taper. If you earn near £100k, sacrifice does double duty: it cuts tax and NI and can restore your personal allowance. Miss that and you leave a 60% effective saving on the table.
• Sacrificing more than the annual allowance. Total pension input across all sources can't exceed £60,000 (or your carry-forward) without a tax charge.⁵

Frequently asked questions

This guide is for general information only. It does not constitute financial, tax or legal advice. Tax rules can change. Always check current GOV.UK guidance and seek professional advice for your specific circumstances.