NI on Salary Sacrifice Calculator (2029) Trending

Pension contributions made via salary sacrifice currently reduce the salary on which employer National Insurance is calculated. At the 2026/27 employer NI rate of 15%, every £1,000 redirected to a pension saves the employer £150 in NI, and many employers pass this saving to employees as an enhanced pension contribution. The employee gains separately, because the sacrificed slice of pay never appears on the payslip and so escapes income tax and employee NI as well.

The National Insurance Contributions (Employer Pensions Contributions) Act 2026, which received Royal Assent on 29 April 2026, caps the NI advantage from 6 April 2029. The first £2,000 a year of pension contributions made by salary sacrifice stays free of NI. Anything above £2,000 is treated as pay for both employee NI and employer NI, while income tax relief is unchanged. Put a figure on that. On a £50,000 salary with £5,000 going into a pension by sacrifice, the employer NI base today is £50,000 less the £5,000 sacrificed and less the £5,000 secondary threshold, giving £40,000 and a bill of £6,000 at 15%. From 2029 only £2,000 of the sacrifice comes off, so the base becomes £43,000 and the bill rises to £6,450, an extra £450 a year for that employee.

For the employee the saving is larger again. Sacrificed pay avoids income tax and employee NI, so combined relief is 28% for a basic-rate taxpayer (20% plus 8%), 42% at the higher rate (40% plus 2%) and 47% at the additional rate (45% plus 2%), rising to 62% on pay between £100,000 and £125,140, where the personal allowance is withdrawn. A higher-rate taxpayer sacrificing £5,000 keeps £2,100 that would otherwise have gone in income tax and NI, so the £5,000 pension boost costs £2,900 in take-home pay. The employer saves £750, which only benefits the employee if it is passed on as an extra contribution. From 2029 the NI part of the saving applies to the first £2,000 only, which cuts this employee's relief by £60 to £2,040.

Employer NI has been a moving target for several years. The rate rose from 13.8% to 15% in April 2025 and the secondary threshold was cut from £9,100 to £5,000 at the same time, with the Employment Allowance lifted to £10,500 to soften the blow for smaller employers. Employee NI travelled the other way across 2024, coming down from 12% to 10% and then to 8%. The next fixed change is the £2,000 salary sacrifice cap from 6 April 2029, which is now law. The Treasury can change the limit by regulations, and details such as how it works across more than one employer are left to secondary legislation. The calculator uses 2026/27 rates and thresholds as its assumption for 2029/30.

Pension is the most common thing to sacrifice and has no ceiling beyond the £60k Annual Allowance, but it is not the only option. Cycle to Work covers a bike costing £1,000 to £3,500, an electric vehicle lease can cut the net cost by 30% to 50% for a higher-rate taxpayer, and holiday buying schemes trade pay for 2-4 weeks of extra leave. Childcare vouchers closed to new entrants in October 2018, though existing recipients carry on. Medical insurance and gym membership do not qualify at all, because both are taxed as benefits in kind.

Most of the traps concern what your reduced salary is then used for. Pay cannot drop below the National Living Wage once the sacrifice is taken, which limits how much lower earners can give up. Mortgage lenders typically assess borrowing on the post-sacrifice figure, so capacity falls. Maternity pay is based on the sacrificed salary unless the contract overrides it and death-in-service cover pays out less. The new State Pension is flat-rate, so a sacrifice only affects it if pay falls below the Lower Earnings Limit (£6,708 in 2026/27), when that year may not count as a qualifying year. Universal Credit runs the other way, since it looks at salary after sacrifice and entitlement can increase.

One further date belongs in any plan built around sacrifice. The age at which you can access a defined contribution pension rises from 55 to 57 on 6 April 2028, so anyone born after 6 April 1973 waits until 57. Lifetime ISA withdrawals stay at 60. If the point of a heavy sacrifice is early retirement, the years between stopping work and reaching that age need bridging, and that bridge is usually built from ISA savings, a Lifetime ISA or property income.