How Salary Sacrifice Pension Tax Relief Works (2026/27)

Salary sacrifice pension contributions do not just attract income tax relief — they also reduce the national insurance contributions paid by both you and your employer. That double saving makes salary sacrifice more valuable than personal pension contributions for most employees, yet many people do not fully understand why.

What is salary sacrifice for pensions?

Salary sacrifice (also called salary exchange) is an arrangement where you agree to reduce your gross salary by an amount equal to your pension contribution. Your employer then pays that amount directly into your pension on your behalf. Because the contribution never appears in your pay packet, it is never subject to income tax or national insurance.

This is different from a standard employee pension contribution, where you receive your full salary, pay tax and NI on it, and then contribute to your pension — receiving basic-rate tax relief added back by the pension provider (the “relief at source” or “net pay” method).

The tax relief in salary sacrifice: how it actually works

With salary sacrifice, your taxable pay falls by the amount sacrificed. That means you pay less income tax and less employee national insurance immediately, via payroll. There is no waiting for HMRC to add tax relief — the saving happens at source.

For a basic-rate taxpayer sacrificing £200 per month in 2026/27:

• Income tax saved: 20% × £200 = £40/month
• Employee NI saved: 8% × £200 = £16/month (on earnings between £12,570 and £50,270)
• Total employee saving: £56/month for a £200 pension contribution — your net cost is £144

For a higher-rate taxpayer (40%) sacrificing £200/month:

• Income tax saved: 40% × £200 = £80/month
• Employee NI saved: 2% × £200 = £4/month (on earnings above £50,270)
• Total employee saving: £84/month — net cost is £116 for a £200 contribution

The employer national insurance saving

This is where salary sacrifice becomes uniquely valuable. When your gross salary falls, your employer also pays less employer national insurance. In 2026/27, employer NI is charged at 15% on earnings above £5,000 per year (the secondary threshold).

On a £200/month salary sacrifice, your employer saves 15% × £200 = £30/month in employer NI. Many employers pass some or all of this saving back to employees as an enhanced pension contribution — effectively giving you free additional pension contributions from the NI saving alone.

If your employer passes the full NI saving back, that £200 sacrifice generates £230 in pension contributions (£200 + £30 employer NI saving) at a net cost to you of just £144.

Salary sacrifice vs relief at source: the difference

Under relief at source, you contribute from net pay and your pension provider claims 20% basic-rate tax relief from HMRC, adding it to your pot. Higher and additional-rate taxpayers claim the extra relief via self-assessment. No NI saving applies — NI is always charged on the full gross salary.

Under salary sacrifice, the NI saving applies to both employee and employer, and the full contribution comes from pre-tax, pre-NI salary. For most employees, salary sacrifice is more tax-efficient because of the NI element.

One exception: if you are a non-taxpayer (earning below £12,570), salary sacrifice provides no benefit — you are not paying income tax anyway, and relief at source is better because HMRC still adds 20% basic-rate relief even for non-taxpayers under that method.

Does salary sacrifice affect other benefits?

Because salary sacrifice reduces your contractual gross salary, it can affect some income-related calculations:

• Mortgage affordability: Most lenders assess borrowing capacity based on your reduced salary figure. This can lower the maximum mortgage amount you qualify for — worth considering before sacrificing a large amount.
• State pension: If your sacrificed salary drops below the lower earnings limit (£6,396 in 2026/27), it could affect your state pension record. This is rarely an issue for full-time employees.
• Statutory pay (maternity, paternity, sick pay): These are calculated on your reduced salary, so large sacrifices can reduce statutory payments.
• Life assurance and income protection: These are often based on salary. Check whether your employer uses the pre- or post-sacrifice figure.

Annual allowance: how much can you salary sacrifice?

You can contribute up to the annual allowance across all pension contributions combined. In 2026/27 this is £60,000 (or 100% of your earnings, whichever is lower). This includes both your own contributions and any employer contributions.

If your employer also contributes (which they almost always do), you need to account for their contribution when calculating your own remaining allowance.

High earners with adjusted income above £260,000 may face the tapered annual allowance, which reduces the £60,000 limit down to a minimum of £10,000. This is a complex area and worth taking financial advice on if it applies to you.

How to find out if your employer offers salary sacrifice

Check your employment contract or staff handbook, or ask your payroll or HR team. Most employers with workplace pension schemes offer salary sacrifice, though a small number still use employee contributions via relief at source.

If your employer does not offer salary sacrifice, it is worth raising with HR: the employer NI saving alone gives the business a direct financial incentive to switch, and the paperwork to set it up is straightforward.

Use our salary sacrifice calculator to model exactly how much you would save based on your salary, tax band, and contribution amount.