Salary Sacrifice Pension Strategy: Saving Tax for Employers and Employees

Salary sacrifice is a formal arrangement under which an employee agrees to reduce their contractual salary in exchange for a non-cash benefit — in this case, an employer pension contribution. Because the contribution comes from the employer rather than the employee, it is not subject to National Insurance (NI) contributions from either the employer or the employee. This is the key advantage over a standard personal or workplace pension contribution.

Used correctly, salary sacrifice is one of the few entirely legal mechanisms by which an employee and their employer can both pay less National Insurance while increasing retirement savings. The benefit compounds over a career. Yet it remains underused, particularly among internationally mobile professionals who may not have had it explained clearly.

How Salary Sacrifice Works

In a standard pension arrangement:

1. The employee receives their gross salary
2. Income tax and National Insurance are deducted from the gross salary
3. The employee makes a pension contribution from their net (post-tax, post-NI) pay
4. The pension provider reclaims basic rate tax relief, and higher-rate taxpayers claim additional relief via self-assessment

In a salary sacrifice arrangement:

1. The employer and employee agree to reduce the employee's contractual salary by the sacrifice amount
2. The employer pays an equivalent amount (and often more — see below) directly into the pension as an employer contribution
3. The reduced salary is subject to income tax and NI — so tax and NI are paid on the lower figure
4. Because it is an employer contribution, the pension payment is also exempt from employer-side NI

The pension pot grows by the same amount either way. But the tax and NI savings change the cost dramatically.

The National Insurance Saving

National Insurance is where the real gain from salary sacrifice lies. Income tax is the same either way — a basic rate taxpayer saves 20% via relief at source under normal rules; under salary sacrifice the income tax saving is equivalent. But NI is different.

Under normal contribution rules:

• Employee NI is paid on the salary before the contribution (at 8% on earnings between £12,570 and £50,270, and 2% above)
• Employer NI is paid on the salary before the contribution (at 15% above the secondary threshold, which is £5,000 in 2026/27)

Under salary sacrifice:

• The sacrificed amount is never part of the salary and therefore never attracts NI for employee or employer

Employee saving: an employee on £60,000 sacrificing £10,000 into their pension saves approximately £200 in employee NI (2% on the element above £50,270) plus a portion at 8% on the band below.

Employer saving: an employer on a £60,000 salary paying £10,000 via salary sacrifice rather than salary saves 15% × £10,000 = £1,500 in employer NI. Many employers share this saving with the employee by adding some or all of it to the pension contribution.

Where employer NI savings are passed on, salary sacrifice becomes even more valuable: the employee's pension pot may actually grow by more than the sacrificed salary, because the employer is adding their NI saving on top.

A Worked Example

Emma is employed at £80,000 per year. She wants to contribute £15,000 to her pension.

Option A: Personal contribution via relief at source

• Emma earns £80,000 and pays tax and NI on it
• She contributes £12,000 net; the provider reclaims £3,000 basic rate relief (gross = £15,000)
• Higher-rate relief of a further £3,000 is claimed via self-assessment (20% on £15,000)
• Total cost to Emma after all relief: £12,000 - £3,000 = £9,000 net of all tax
• Employer NI is unchanged (based on £80,000 salary)

Option B: Salary sacrifice

• Emma's contractual salary is reduced to £65,000
• Employer pays £15,000 directly into her pension
• Emma's income tax is paid on £65,000 (saving approximately £6,000 at 40%), net salary £65,000 minus tax and NI
• Employer NI is paid on £65,000 rather than £80,000 — saving £2,250 (15% × £15,000)
• If the employer passes the NI saving to Emma's pension, the total pension contribution becomes £17,250 for the same salary sacrifice

The salary sacrifice route typically results in a higher pension contribution for the same effective cost to Emma, because employer NI is saved and often redirected.

Income Tax Comparison

For basic rate taxpayers, salary sacrifice and relief-at-source produce the same income tax outcome. The difference is purely the NI saving.

For higher-rate taxpayers, salary sacrifice has an additional advantage: the income tax relief is automatic (salary is reduced before tax is calculated), while under relief at source, higher-rate taxpayers must actively claim the additional 20% via self-assessment. Salary sacrifice removes the risk of forgetting to claim.

For very high earners subject to the tapered annual allowance (adjusted income above £260,000), salary sacrifice reduces "adjusted income" — the figure used to calculate the taper. A large salary sacrifice can bring adjusted income below the £260,000 taper threshold, restoring a higher annual allowance. This interaction is worth modelling carefully.

Protecting Important Benefits

Salary sacrifice reduces the employee's contractual salary. This can affect:

Mortgage affordability calculations. Lenders typically assess borrowing capacity based on contractual salary. A salary reduced by sacrifice may reduce the maximum mortgage available. For employees planning to purchase property, the timing of a salary sacrifice arrangement matters.

Life insurance and income protection. Some group life and income protection policies are based on "salary" — if that is defined as contractual salary, the sacrifice reduces the benefit. Check scheme definitions before agreeing the sacrifice.

State Pension. The State Pension entitlement depends on years of National Insurance contributions. Salary sacrifice reduces NI paid — but only on the sacrifice amount. If the sacrificed salary still leaves the employee earning above the Lower Earnings Limit (£6,708 in 2026/27), NI credits are preserved and State Pension entitlement is unaffected in practice.

Statutory payments. Statutory Maternity Pay, Statutory Sick Pay, and similar state payments are calculated on "normal weekly earnings" which use contractual pay. A significantly reduced contractual salary could reduce statutory payment levels.

Internationally Mobile Workers

For UK employees posted overseas who remain on a UK payroll, salary sacrifice remains available and the same rules apply. The NI savings are the same; the income tax savings depend on whether UK tax is being paid on the salary.

For UK nationals returning from overseas and re-joining a UK employer, agreeing a salary sacrifice arrangement from the start of employment is straightforward and begins the NI saving immediately.

For those considering whether to structure their working arrangement in a way that allows salary sacrifice, the legal requirement is that the sacrifice is a genuine contractual reduction in salary — not a post-tax payment recharacterised as employer contribution after the event. The arrangement must be in writing and preceded by the salary reduction.

The Self-Employed Cannot Use Salary Sacrifice

Salary sacrifice is only available in an employer-employee relationship. Self-employed individuals and company directors who take their remuneration entirely as dividends cannot sacrifice salary because there is no salary to sacrifice in a meaningful sense.

For company owner-directors, the equivalent strategy is to make employer contributions directly from the company into a SIPP or occupational pension. This achieves a similar outcome (employer NI is not paid on pension contributions) and may also be allowable against corporation tax as a business expense.

Compliance Note

This article is for general information only and does not constitute regulated financial advice. The tax and National Insurance treatment of salary sacrifice depends on the structure of the arrangement, the employer's payroll processes, and individual circumstances. Rules are subject to change. Global Investments Limited is authorised and regulated by the Financial Conduct Authority. Seek professional advice before implementing or amending salary sacrifice arrangements.

How Global Investments Can Help

Whether you are an employee looking to maximise the value of your workplace pension or an employer seeking to design a cost-effective benefit structure, Global Investments can advise on salary sacrifice pension strategies. For high earners near the tapered annual allowance threshold, we model the full interaction between salary sacrifice, adjusted income, and annual allowance. Contact us to discuss your situation.