What Is a Salary Sacrifice Pension Scheme?

Pension salary sacrifice is a genuine change to contractual remuneration. The employee accepts a lower cash salary and the employer makes an additional employer pension contribution in return. Payroll calculates PAYE and National Insurance on the reduced cash pay under the current rules.

HMRC's salary sacrifice guidance on GOV.UK says the agreement should change the employee's entitlement to cash before the pay is earned. It is not simply a deduction made after gross pay has arisen. ACAS guidance on changing employment contracts is also relevant: explain the proposal, obtain agreement and record the variation clearly rather than changing pay unilaterally.

Do not describe all of the income tax reduction as a special salary sacrifice saving. Pension contributions can receive income tax relief through relief at source, net pay arrangements or salary sacrifice, although the route and cash-flow effect differ.

The additional attraction of salary sacrifice is the current NIC treatment. Sacrificed pay is generally outside employee Class 1 NICs and employer Class 1 secondary NICs because it becomes an employer pension contribution. The employee may save 8% or 2% depending on their earnings band, while the employer may save 15% in 2026/27. Check the actual marginal bands rather than applying one percentage to every employee.

Assume an employee earning £40,000 sacrifices £4,000 during 2026/27 and all of it falls within the main employee NI band. The new contractual cash salary is £36,000 and the employer pays £4,000 to the pension.

• Employee NI falls by about £320 at 8%.
• Employer NI falls by about £600 at 15%.
• PAYE income tax on cash pay falls by £800 at a 20% marginal rate.

That £800 is pension tax relief delivered through payroll, not necessarily an advantage unique to sacrifice. The distinctive saving versus an otherwise equivalent pension contribution is normally the £320 employee NI reduction, plus any share of the employer's £600 NI saving that the scheme passes on.

HM Treasury has announced on GOV.UK that from April 2029, the amount of employee pension contribution made through salary sacrifice that remains exempt from National Insurance will be capped at £2,000 a year. Contributions above £2,000 can still be made through salary sacrifice and remain exempt from income tax, but employee and employer NICs will apply to the excess under the announced policy.

For a £4,000 annual sacrifice, the first £2,000 would retain the NIC exemption and the remaining £2,000 would not. Ordinary employer pension contributions are not the target of this cap. Keep current and 2029 projections separate until final legislation and payroll specifications are available.

Salary sacrifice must not reduce cash pay below the applicable National Minimum Wage or National Living Wage for the hours worked. Use the current GOV.UK rate for the employee's age and pay reference period, not an annual salary shortcut alone.

For example, if a worker's post-sacrifice hourly pay is only a few pence above the legal floor, unpaid extra time, a longer pay-period schedule or a birthday rate change can create a breach. Cap or pause sacrifice automatically when headroom is insufficient. The restriction applies even if the employee actively requests a larger pension contribution, because minimum wage cannot be waived by agreement.

The lower contractual cash salary can affect average earnings used for Statutory Maternity Pay and other statutory payments, and may reduce earnings-related life cover, overtime rates, mortgage references or redundancy terms if scheme documents use actual post-sacrifice salary. An employee close to a qualifying threshold needs an individual check before joining.

An edge case arises when family leave begins during an earnings assessment period: changing or stopping sacrifice later may not restore the earlier average earnings figure. State whether salary-linked benefits use actual salary or a separate notional pre-sacrifice salary. GOV.UK lists affected benefits; payroll and pension-provider rules should then be checked together.

Salary sacrifice does not replace auto-enrolment duties. Assess the worker under the pension scheme's rules, make at least the required contribution and tell the provider that sacrificed amounts are employer contributions. Be clear whether the scheme's contribution percentages use pre-sacrifice notional salary, post-sacrifice cash salary or qualifying earnings.

The written variation should identify the amount or percentage sacrificed, effective date, treatment of employer NI savings and permitted changes. ACAS recommends consultation and agreement where contracts change. Include a route to stop or alter sacrifice after defined lifestyle events, but avoid an arrangement that leaves the employee with an unrestricted continuing right to cash instead.

First compare salary sacrifice with the pension method already in use so that income tax relief is not double-counted as a new benefit. Then model employee NI, employer NI and take-home pay at the person's actual marginal rates. Check minimum wage, statutory-pay exposure, auto-enrolment and every salary-linked benefit.

Use the salary sacrifice pension calculator for current-year figures and retain a separate April 2029 scenario with only £2,000 of sacrificed employee pension contributions exempt from NICs. Review HMRC and HM Treasury guidance before implementation, because payroll treatment must follow the final legislation rather than an old policy illustration.