Pension salary sacrifice tax rules: Income Tax relief stays, National Insurance is saved on the pay you give up, and a £2,000 cap on that saving starts in April 2029.
Salary sacrifice for a pension mostly changes which pay is taxed, so the tax and National Insurance effects are worth separating. Your own saving turns on pay, employer and where in the UK you live. To see these tax rules beside your own payslip, use the form on this page so an FCA-authorised adviser can phone and go over your sacrifice, free. Below are the general rules as GOV.UK and HMRC set them out.
Does pension salary sacrifice reduce your income tax?
Yes, because the pay you give up is never counted as your taxable pay. HMRC describes a salary sacrifice arrangement as "an agreement to reduce an employee's entitlement to cash pay, usually in return for a non-cash benefit", and for a pension the benefit is an extra employer contribution. In one of HMRC's examples a £5,000 bonus is given up for a £5,000 employer contribution to a registered pension scheme, with "no employment income tax or National Insurance contributions charge to the employee".
The reason is that no tax is charged on what an employer pays into a registered pension scheme for an employee. The GOV.UK guidance for employers says the same in terms. HM Treasury adds that pension contributions made this way stay exempt from Income Tax "subject to the usual limits", and the annual allowance is one such limit: how it treats sacrificed pay has its own page.
A lower taxable pay also means a lower adjusted net income. HMRC notes that this figure decides eligibility for some means-tested help such as Tax-Free Childcare and is relevant to thresholds including the Personal Allowance taper. Why that matters to higher earners is covered in the guide to relief on income just over the taper, and employer contributions and adjusted net income explains the measure itself.
Salary sacrifice is one of several ways workplace pension contributions get Income Tax relief. If you are not sure which one your scheme uses, relief at source, net pay and salary sacrifice compared sets them side by side. Where in the UK you live can change the Income Tax side, which the Scotland guide covers.
How much National Insurance does salary sacrifice save?
It saves National Insurance at whatever rate would otherwise have applied to the pay you gave up, for you and for your employer. HMRC explains that salary sacrifice "can allow employees and employers to pay less payroll taxes than they otherwise would have done", which is the reason employers offer it where they do.
For 2026 to 2027, GOV.UK lists the employee Class 1 rate as 8% on pay between £242 and £967 a week, and 2% on pay above £967 a week. The employer rate shown in HMRC's rates table for the most common National Insurance category letter, A, is 15%. Below the primary threshold of £242 a week (£12,570 a year) category A employees pay 0%, so there is no employee National Insurance to save on that part of pay. Employers' rates apply from the secondary threshold of £5,000 a year. Once you reach State Pension age, GOV.UK says employed people stop paying Class 1 National Insurance, so from then on there is no employee National Insurance left to save.
| Pay sacrificed | Rate that would have applied | National Insurance not charged |
|---|---|---|
| £1,000, employee side, main band | 8% | £80 |
| £1,000, employee side, above £967 a week | 2% | £20 |
| £1,000, employer side, category A | 15% | £150 |
Each row is one rate applied to a round £1,000, assuming the whole amount falls in a single band and pay is above the thresholds, so it is not anyone's actual saving. Whether your pension contributions are then worked out on your full pay or your reduced pay is for the employer: HMRC says the employer decides, and that a notional level of pay is often used so that people sacrificing salary "are not put at a disadvantage".
Employer pension contributions are free of National Insurance either way. Treasury states that "all employer pension contributions will continue to be free of NICs", and HMRC separately says relief on traditional employer contributions that do not involve sacrifice is unchanged. So the saving comes from moving your own contribution out of your taxed pay, not from the employer paying in.
How does a lower cash salary feed through to benefits and pay-linked extras?
Several things are linked to your cash pay, and HMRC's guidance for employers lists them. The effect depends on the benefit and on how much you give up:
- National Insurance record. HMRC says salary sacrifice may affect entitlement to contribution-based benefits such as the State Pension, because "it may reduce the cash earnings on which National Insurance contributions are charged". The page on the State Pension explains how qualifying years work.
- Earnings-related benefits. Examples HMRC gives are Maternity Allowance and Additional State Pension, where the amount received may be less or the entitlement lost. Salary sacrifice and maternity leave looks at the leave side.
- Statutory pay. HMRC says it can affect the amount, and "can cause some employees to lose their entitlement altogether" if average weekly earnings fall below the lower earnings limit.
- Minimum wage. The arrangement must not reduce cash earnings below the National Minimum Wage, which is the subject of how much you can sacrifice.
- Pay-linked extras. Employers usually decide how earnings-related payments such as overtime rates, pay rises and occupational pension contributions are calculated, either on notional salary or on the reduced cash salary, and must make clear which.
- Swapping back and forth. As a general rule, HMRC says, the expected tax and National Insurance advantages do not apply if an employee can swap between cash and the benefit whenever they like, though an arrangement can allow opting in or out after a lifestyle change such as marriage, divorce or a partner becoming redundant or pregnant.
Which of these touches you depends on your employer's terms and your own plans, for example a mortgage application or a baby due. If your employer's terms and plans like these pull in different directions, an FCA-authorised adviser can untangle them free when your salary sacrifice query arrives via the form on this page. For the wider weighing-up, is salary sacrifice worth it goes through the trade-offs.
What is the April 2029 cap on National Insurance relief?
It is a limit of £2,000 a year on the National Insurance exemption for salary-sacrificed pension contributions, and it applies from April 2029. The Treasury guidance of 26 November 2025 says "the amount that is exempt from National Insurance contributions (NICs) will be capped at £2,000 a year for employee contributions made via salary sacrifice". Only the first £2,000 each year stays exempt. Above it, "employee contributions above this amount will be subject to employer and employee NICs like other employee workplace pension contributions".
The Income Tax side does not change. Treasury says contributions made this way "will still be exempt from Income Tax", and HMRC's paper, published on 4 December 2025, says the change removes the exemption "for Class 1 National Insurance contributions only". Sacrificed pay above the limit then attracts primary contributions for employees and secondary contributions for employers. Employer pension contributions that are not salary sacrifice are not capped.
Which parts of the cap are already in an Act?
The power to charge and the first £2,000 figure are; the payroll detail is still to come.
| Part of the change | Status |
|---|---|
| The £2,000 cap and April 2029 start | Announced by HM Treasury on 26 November 2025; HMRC's paper gives the operative date as 6 April 2029 |
| Power to charge National Insurance on sacrificed pay | In law: section 1 of the National Insurance Contributions (Employer Pensions Contributions) Act 2026, Royal Assent 29 April 2026, effective for the tax year 2029-30 and later |
| The £2,000 figure itself | To come in regulations under section 1; the Act fixes £2,000 as the limit those first regulations must set |
| How the limit works in payroll | HMRC says details will be set out in secondary legislation "in due course"; Treasury says further guidance will be published before April 2029 |
Section 1 came into force at Royal Assent, but its amendments apply only for 2029-30 onwards, so nothing changes what is charged before then. Check GOV.UK for the regulations and guidance when you plan a larger sacrifice. For the dates and the Act's wording in full, the page on the pension salary sacrifice changes is the place.
How much extra National Insurance does HMRC expect?
Among people who sacrifice more than £2,000 a year, HMRC estimates an average extra employee National Insurance bill of £84 for 2029 to 2030, and notes that some may cut what they sacrifice to limit the effect. It estimates that 7.7 million employees pay into pensions this way, of whom 3.3 million give up more than £2,000 of pay or bonus. Treasury's view is that "most employees making typical contributions will not be affected", and employees will not need to contact HMRC, because employers will make the changes. Employers will need to report the total sacrificed through their existing payroll software.
Tax and National Insurance on pension salary sacrifice: more answers
Do employer pension contributions attract National Insurance?
No. Treasury says all employer pension contributions stay free of NICs, and the 2029 cap only concerns the part of your own pay given up through salary sacrifice. The relief on ordinary employer contributions is left alone by the change. See also whether employer contributions are taxable on you.
Can I sacrifice a bonus into my pension?
Where the employer offers it, yes in principle: HMRC's own example gives up a bonus for an employer contribution, and HMRC's figures on the 2029 cap count sacrificed "salary or bonuses". The arrangement works by changing the terms of your employment contract, which HMRC says you need to agree to, so it depends on your employer offering it.
Why do employers offer pension salary sacrifice?
HMRC says it lets employers pay less National Insurance, but "this is only available where it is offered by employers, and not everyone can use it". What an employer does with its own saving is for that employer to decide.
Do I have to do anything about the 2029 cap?
Treasury says employees will not need to contact HMRC. What you may want to do is check, nearer the time, whether your yearly sacrifice goes past £2,000, with AVCs as one alternative way to top up.
Is there a calculator for my own saving?
The rates above show the principle only. Tax code, pay pattern and what your scheme does with notional pay all feed into a worked figure, and a free call lets an FCA-authorised adviser untangle all three with you; send your sacrifice query using the form on this page.
Sources
- HMRC guidance for employers, Salary sacrifice for employers, last updated 6 April 2026
- HM Treasury, the guidance on the April 2029 change, published 26 November 2025
- HMRC, policy paper on the reform, dated 4 December 2025
- The 2026 Act, section 1 on legislation.gov.uk, Royal Assent 29 April 2026
- GOV.UK, how much National Insurance you pay, accessed 29 October 2026
- HMRC, employer rates and thresholds for 2026 to 2027, last updated 1 September 2026
- GOV.UK, when you stop paying National Insurance, accessed 29 October 2026