What are the disadvantages of salary sacrifice for a pension?

It cannot reduce pay below the National Minimum Wage; it lowers the salary used for death-in-service cover, statutory maternity and redundancy pay and mortgage affordability; it does not relieve the tapered annual allowance; and the money is inaccessible until at least age 55 (57 from 2028).

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Is salary sacrifice worth it? The pros, the cons and the catches

Salary sacrifice is usually the most efficient way to fund a pension. The size of the benefit turns on the employer, the income, and a handful of catches.

Based on the National Minimum Wage Act 1998, SSCBA 1992 and FA 2004.

5 min read · Last reviewed 23 Jun 2026

Salary sacrifice saves income tax and National Insurance, and a good employer adds its own NI saving on top. For most employees that makes it the most tax-efficient way to pay into a pension. Whether it is worth it in a given case depends on the circumstances, and there are real trade-offs.

When it’s clearly worth it

The case is strongest when your employer passes on some or all of its NI saving; when your salary is below the upper earnings limit, so you save 8% rather than 2% employee NI; and when the sacrifice drops your adjusted net income through a threshold — out of the £100k/60% trap, back under the child benefit charge, or below the £100,000 childcare cliff. In those bands the effective return can exceed 100%.

The catches

It cannot reduce your pay below the National Minimum or Living Wage — which limits how much a lower earner can sacrifice. It lowers the salary used for some benefits: death-in-service cover (often a multiple of salary), statutory maternity and redundancy pay, and the income a mortgage lender will work from. It does not help with the tapered annual allowance — a post-2015 arrangement is added back to threshold income — and the contribution still has to fit within your £60,000 annual allowance plus carry-forward. And the money is locked away until at least age 55 (57 from 2028).

National Minimum Wage Act 1998 ; FA 2004 s.228ZA(5) (threshold-income add-back).

When to think twice

If you are close to the National Minimum Wage, applying for a mortgage, planning a period of statutory parental leave, or rely on a salary-multiple death-in-service benefit, weigh the sacrifice against those. None of these is a reason not to do it — they are reasons to size it deliberately. The salary sacrifice calculator shows the net cost and the pension uplift so you can judge the trade.

From April 2029 a cap on the National Insurance relief is planned — read what the 2025 Budget announced.

Common questions

Is salary sacrifice worth it?: For most employees, yes — it saves income tax and National Insurance and often adds the employer’s NI saving to the pension, which a personal contribution cannot. It is most valuable when the employer passes on its NI saving and when it drops your income through a tax or benefit threshold.
What are the disadvantages of salary sacrifice for a pension?: It cannot reduce pay below the National Minimum Wage; it lowers the salary used for death-in-service cover, statutory maternity and redundancy pay and mortgage affordability; it does not relieve the tapered annual allowance; and the money is inaccessible until at least age 55 (57 from 2028).

Sources & grounding

Tax and NI saving: SSCBA 1992 s.8/s.9; ITEPA 2003 (employment income).
NMW floor: National Minimum Wage Act 1998 — salary sacrifice cannot reduce pay below the statutory minimum (HMRC NMWM11000 area).
Salary-linked benefits and annual-allowance interaction: FA 2004 s.228ZA(5); PTM057100.

For planning and illustration purposes only. Verify all inputs against source documents. This explainer does not constitute financial or tax advice.