Guide

Salary Sacrifice for Pensions — How It Works 2026/27

Published by the UK Money Calculators editorial team. Last updated for the 2026/27 tax year.

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. 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 per year into their pension. All of it sits in the basic-rate and main-rate NI bands.

  • Income tax saving: 20% × £2,000 = £400
  • Employee NI saving: 8% × £2,000 = £160
  • Total personal saving: £560 per year
  • Net cost of £2,000 pension contribution: £2,000 − £560 = £1,440
  • Employer NI saving: 15% × £2,000 = £300 (may be passed to your pension)

The same £2,000 under relief at source saves only £400 in income tax — no NI saving. Salary sacrifice saves an extra £160 per year for the same pension contribution. That difference comes entirely from the NI treatment.

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, but they still count towards your total pension input. The annual allowance for 2026/27 is £60,000, or 100% of earnings if lower. 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.

Calculate your savings

Use the salary sacrifice calculator to see your exact income tax and NI saving, employer NI saving and net monthly cost at your salary level.

Open the calculator →

Frequently asked questions

Is salary sacrifice better than a normal pension contribution?

For employed workers, yes. Salary sacrifice saves income tax plus National Insurance on the sacrificed amount. A standard employee contribution under relief at source only saves income tax. The NI saving (8% for most employees) is what makes the difference. If your employer passes back their NI saving too, the advantage is even greater.

Does salary sacrifice affect my mortgage application?

Potentially yes. Some lenders base affordability on your contractual salary, which is lower under salary sacrifice. If you're about to apply for a mortgage, it may be worth deferring changes until after the application. Other lenders take a more holistic view. Check with your adviser.

Does salary sacrifice affect my State Pension?

Only if your post-sacrifice salary falls below the Lower Earnings Limit (£6,396 for 2026/27). If your salary remains above this level after sacrifice, your State Pension entitlement is unaffected.

Can I change or stop salary sacrifice mid-year?

This depends on your employer's scheme rules. Many schemes only allow changes at set windows (start of year, open enrolment) or on specific life events. HMRC requires salary sacrifice arrangements to be genuine changes to the employment contract, not flexible pay arrangements. That is why most schemes restrict how often you can alter the amount.

What is the employer NI rate on salary sacrifice in 2026/27?

Employer secondary NI is 15% on employee earnings above £5,000 per year. Each £1,000 of salary sacrifice saves the employer £150. On a £5,000 annual sacrifice the employer saves £750. Ask your employer whether any of this saving is directed to your pension.

Official sources

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.