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The 2025 Budget was delivered under unusual circumstances, following an OBR leak that pre-empted Rachel Reeves’ statement. While much of the content was anticipated, the most significant development for reward leaders was confirmation of the .

Under current rules, employees can sacrifice any level of salary into pensions without triggering NI contributions. This new measure, effective April 2029, will restrict NI savings on employee pension contributions via salary sacrifice to £2,000 per year. Importantly, income tax relief remains unaffected.

Key details

Employee impact:

NI payable on contributions above £2,000:

• 8% for salaries under ~£50,000
• 2% for salaries above this threshold

Employer impact:

• 15% Employer NI (ERNI) payable on contributions above the cap

Fiscal impact:

• OBR projects an additional £4.7bn revenue by 2029–30

Public sector pension schemes, which typically operate under net pay arrangements, will be largely unaffected by the NI cap. HMRC data indicates that salary sacrifice is far more prevalent in the private sector, with around 30% of employees participating, compared to only 10% in the public sector.

Can employees still contribute more than £2,000?

Yes. Employees can continue to sacrifice more than £2,000 into pensions and will still receive full income tax relief. The difference is that NI will be payable by both employees and employers on contributions above the cap.

Implications for Enterprise Employers

For organizations with significant pension salary sacrifice participation, the cap will materially increase ERNI costs. Early modeling suggests annual increases ranging from £250k to £875k for some workplace pension schemes.

This has several knock-on effects:

• Funding models: Many employers currently recycle NI savings into other benefits or additional pension contributions. The cap risks a domino effect, requiring reassessment of total reward design.
• Cost allocation: Employers will need to decide whether to absorb higher ERNI costs or adjust benefit structures.
• Employee perception: Where ERNI savings have been rebated to employees, changes may be perceived as a reduction in value, requiring proactive communication.

Additional considerations for employers and employees

highlights the broader risks associated with the NI cap. External modelling from AJ Bell suggests that an employee earning £55,000 and contributing 10% of salary via salary sacrifice could see their annual take-home pay fall by around £188 once the cap is applied. Longer-term projections are even more striking. A 35-year-old earning £50,000, with an existing £30,000 pension pot and contributing 5% personally plus 3% from their employer, could see their retirement savings reduced by around £22,060 by age 65.

The change will have a direct influence on how employers shape benefits and the value employees receive. Research from the Association of British Insurers indicates that around one-third of employers expect to reduce pension contributions in response to the cap, while nearly half anticipate cutting back on other benefits or services.

These findings reinforce the need for early planning, clear communication, and proactive modelling to protect both employees and total reward strategies.

How Benifex can support

Helping customers maximize NI savings while they can is critical. Options such as bonus sacrifice should be considered where not already in place.

At Benifex, we are working with customers to:

• Model the financial impact of the cap across different workforce profiles
• Re-evaluate benefit structures funded by NI savings
• Develop communication strategies to manage employee expectations
• Explore alternative savings mechanisms to maintain competitiveness in total reward

Conclusion

The NI cap on pension salary sacrifice is a structural change with significant implications for private sector reward strategies. While implementation is deferred until 2029, senior reward leaders should begin preparing now — both to mitigate cost increases and to safeguard the integrity of total reward propositions.

For further discussion or support in modelling the impact, please contact us to arrange a call tailored to your needs.

Prepare for 2029 with the latest insights

The NI cap on pension salary sacrifice is just one of many changes reshaping the benefits landscape. To help you stay ahead, we’ve compiled the Big Benefits Report 2025/2026 — the most comprehensive research on workplace benefits trends, costs, and employee expectations.

Download the Big Benefits Report 2025/2026 today and equip your reward strategy with the data and insights you need to prepare for the future.