Employee benefits and National Insurance — how employers reduce their NI liability

Employer NI contributions can be reduced through salary sacrifice — without reducing employee take-home pay

When employees contribute to their pension through a salary sacrifice arrangement rather than a direct employee contribution, the employer pays NI only on the reduced salary. The saving flows directly to the employer's bottom line. At the current employer NI rate of 15%, the sums are material at any scale.

How salary sacrifice works for employers

In a standard pension contribution arrangement, an employee earns a salary of, say, £40,000 and makes a pension contribution from their post-tax, post-NI pay. The employer pays Class 1 NI on the full £40,000 salary.

Under a salary sacrifice arrangement, the employee agrees to reduce their salary to £37,000 in exchange for the employer making a £3,000 pension contribution on their behalf. The employer now pays NI only on £37,000. At 15% employer NI, that is a saving of £450 per employee per year on this example alone.

Many employers redirect some or all of this NI saving back into the employee's pension — increasing the contribution without any additional net cost to the employer. This makes the arrangement attractive to both parties and is the standard approach recommended by most pension advisers.

The NI saving across a typical SME workforce

Illustrative figures only. Actual savings depend on workforce composition, salary levels, contribution rates and individual circumstances. Professional advice should be obtained before implementing any arrangement.

Other benefits with NI efficiency

Pension salary sacrifice is the largest single source of NI saving available to most employers, but it is not the only one. Several other employee benefits are structured to be NI-efficient:

• Cycle to Work schemes — employer-provided cycles and equipment are exempt from NI up to HMRC-specified limits
• Electric vehicle salary sacrifice — HMRC-approved schemes reduce both employer and employee NI on the benefit
• Group life assurance and group income protection — premiums are typically a business expense deductible for corporation tax
• Employer-funded pension contributions — direct employer contributions above the salary sacrifice element are also NI-free

Why most SMEs are not capturing the full saving

The most common reason employers do not have salary sacrifice in place is that their workplace pension was set up without it — often through auto-enrolment as a compliance exercise rather than a benefits strategy. The scheme is running, the contributions are being made, but the NI efficiency has never been addressed.

A benefits review — the first pillar of the Aetas Workplace Performance Audit — identifies exactly this. In one recent engagement with an 85-person business, pension charge reductions and NI efficiency improvements together saved the employer over £45,000 per year. The full programme fee was recovered in under four months.

Common questions

HMRC guidance on salary sacrifice arrangements is available at gov.uk/guidance/salary-sacrifice. Employer NI rates and thresholds are published by HMRC. Auto-enrolment duties are set out at The Pensions Regulator. This guide is for information only and does not constitute regulated financial or tax advice.