Bonus Sacrifice into Pension: Mechanics, Tax Savings, and Practical Considerations

For employees who receive a significant annual bonus, the decision of how to take it — cash, or into a pension — is one of the most consequential annual financial decisions they make. A bonus received as cash is subject to income tax at the marginal rate (20%, 40%, or 45%) and employee National Insurance contributions (2% above the upper earnings limit, or 8% below it in 2026/27). A bonus sacrificed directly into a pension enters the pension gross — with no income tax and, crucially, no NI.

The NI saving is what makes bonus sacrifice particularly valuable compared with making a personal pension contribution from post-tax pay. A personal contribution receives income tax relief (the tax back) but not NI relief. Salary sacrifice (including bonus sacrifice) provides both.

How Bonus Sacrifice Works

A salary sacrifice arrangement is a legal agreement between the employer and employee to reduce the employee's contractual remuneration — in this case, the cash bonus — in exchange for a non-cash benefit: the employer's pension contribution. The mechanics are:

1. The bonus is declared (or expected) by the employer.
2. Before the bonus is paid, the employee makes a formal election to sacrifice some or all of the bonus.
3. The employment contract (or a supplementary agreement) is amended to reflect the sacrifice.
4. The employer pays the sacrificed bonus amount directly into the employee's pension as an employer contribution.
5. The employee does not receive the cash bonus — and therefore does not pay income tax or NI on it.

The critical requirement is that the sacrifice is agreed before the bonus is earned or the entitlement to receive it crystallises. A sacrifice agreed after the bonus has been paid (or after the right to receive it has irrevocably accrued) is treated by HMRC as a payment of cash followed by a voluntary pension contribution — and does not carry the NI benefit.

The Tax Maths

Consider an employee in the 45% tax bracket (income above £125,140 in 2026/27) expecting a £50,000 bonus:

Cash receipt:

• Income tax at 45%: £22,500
• Employee NI at 2%: £1,000
• Net received: £26,500

After-tax cash pension contribution: If the employee takes the £26,500 cash and puts it into a pension, basic-rate tax relief of £6,625 (20%) is added, and the employee can claim higher/additional-rate relief via self-assessment. But NI has already been paid — that money cannot be recovered.

Bonus sacrifice:

• Employer contributes £50,000 direct to pension
• No income tax, no NI
• Full £50,000 enters the pension

The difference: £50,000 in the pension versus £26,500 cash (which becomes approximately £33,125 after basic-rate relief if contributed to a pension — still £16,875 short of the sacrifice outcome).

For the employer, bonus sacrifice also reduces employer NI. The employer pays NI at 15% on employee bonuses (on earnings above the secondary threshold, following the rate increase from 13.8% on 6 April 2025). Sacrificing the bonus eliminates the employer NI charge, saving the employer £7,500 on a £50,000 bonus. Many employers pass some or all of this saving back to the employee as additional pension contribution — which can be worth negotiating.

Annual Allowance Implications

Bonus sacrifice contributions count as employer contributions for annual allowance purposes. A large bonus sacrifice can easily push total pension input for the year above the £60,000 annual allowance. If the employee has already used some of the current year's allowance through regular salary sacrifice or other contributions, the remaining capacity may be less than the bonus amount.

Carry forward of unused allowance from prior years can help. An employee who has not used the full annual allowance in the previous three years may have up to £180,000 of additional capacity, allowing a very large bonus to be sacrificed without an annual allowance charge.

For employees subject to the tapered annual allowance (threshold income above £200,000, adjusted income above £260,000), the bonus sacrifice affects both tests:

• Salary sacrifice reduces threshold income (since the sacrificed bonus does not appear as income).
• But the employer contribution funded by the sacrifice is added back in the adjusted income calculation.

If the employee's adjusted income is above £260,000 even after the sacrifice, the tapered annual allowance may still apply. Detailed modelling of the threshold/adjusted income position before making the sacrifice election is advisable.

The MPAA Complication

Employees who have previously triggered the Money Purchase Annual Allowance (MPAA) — by taking flexible pension income — are limited to £10,000 of money purchase pension contributions per year. A large bonus sacrifice would breach the MPAA and trigger an annual allowance charge on the excess.

This is a significant risk for older employees who have previously accessed pension benefits and are still in employment. They should check whether the MPAA has been triggered before making any bonus sacrifice election.

Statutory and Benefits Interactions

Salary sacrifice arrangements — including bonus sacrifice — can affect:

Mortgage affordability. Lenders base affordability assessments on employment income. If a significant portion of remuneration is sacrificed, the stated income for mortgage purposes may be lower. Some lenders will include sacrificed amounts; others will not. This is worth checking before sacrificing a bonus if a mortgage application is contemplated.

Life insurance and income protection. Death-in-service benefits and group income protection policies are typically calculated as a multiple of pensionable salary. Whether bonus income is included in the pensionable salary definition — and whether a sacrificed bonus affects the calculation — depends on the scheme rules.

Pension contributions from the employer. If the employer's matching contribution is calculated as a percentage of salary/bonus, sacrificing the bonus may reduce the matching contribution. Check the employment contract and pension scheme rules.

Student loan repayments. Student loan repayments are calculated on "Plan income" which is broadly based on taxable income. Bonus sacrifice reduces taxable income and therefore reduces student loan repayments — a benefit for employees still repaying student loans.

Universal Credit and other means-tested benefits. Bonus sacrifice reduces income for UC calculation purposes — potentially increasing UC entitlement, though this is relevant only for lower earners who would receive a bonus while also receiving UC.

Employer Agreement and Process

An employer is not legally required to offer bonus sacrifice. It is a contractual arrangement, and the employer must agree to it. Most major employers who have a general salary sacrifice scheme (for example, for regular pension contributions) will also accommodate bonus sacrifice, but the process and timing requirements vary.

Employees should:

• Check whether the employer's existing salary sacrifice scheme covers bonuses.
• Submit the election form before the bonus calculation date, or at minimum before the payroll is processed for the period in which the bonus would be paid.
• Obtain written confirmation from the employer of the sacrifice arrangement.
• Ensure the pension scheme has received the employer contribution and that it is correctly attributed to the member's account.

For employees in net pay schemes (where contributions are deducted before income tax is calculated), the mechanics differ slightly from relief-at-source schemes, but the NI treatment — and the fundamental benefit of bonus sacrifice — is the same.

This guide provides general information only. Tax treatment depends on individual circumstances and rules can change. The interaction with the tapered annual allowance, MPAA, and employer-specific benefit calculations requires individual modelling. Always seek regulated financial advice before making large sacrifice elections.

How Global Investments Can Help

Global Investments advises employees and executives on pension contribution strategies — including bonus sacrifice, carry forward planning, and coordinating pension input with the tapered annual allowance. Our advisers help clients maximise the pension benefit from bonus and incentive income in a fully compliant and tax-efficient way.

If you receive a significant bonus and want to understand how much can be efficiently directed to your pension, contact our advisory team to arrange a review.