Salary sacrifice cap and the middle income trap

Adele Clapp, Tax director, Bishop Fleming. Croner.

When the salary sacrifice NI threshold is capped at £2,000, there will be hidden costs for employers and staff alike, as the change cuts across different income bands, warns Adele Clapp, tax director at Bishop Fleming.

While the £2,000 cap on national insurance free salary sacrifice pension contributions was framed as a tax on high earners, the reality is far messier. On paper, it looks like a targeted measure aimed squarely at the wealthy. In practice, it hits middle income savers and small and medium-sized businesses the hardest.

In fact, far from being a simple restriction on tax-efficient pension saving, the cap risks distorting incentives and undermining both retirement planning and employer-sponsored pension schemes.

An NI imbalance

The crux of the issue is how national insurance (NI) rates apply across different income bands. Under the new rules, from April 2029, salary sacrifice pension contributions can continue, but only the first £2,000 of employee contributions will be exempt from NI each tax year.

Any salary sacrifice contribution above £2,000 will be subject to NI for both employees and employers. It is a fundamental shift that breaks what made salary sacrifice so effective – the ‘win-win’ in which both worker and company save money by doing the right thing for the future.

Where total pension contributions are modest (up to 6% of pay), those individuals who earn between £35,000 and £50,270 will pay an 8% NI charge on pension contributions above the £2,000 cap.

On the other hand, individuals whose earnings already exceed the upper earnings limit (UEL) of £50,270 will pay employee NI at just 2% on those same excess contributions.

The result is an NI imbalance. Middle-income earners such as teachers, nurses and other skilled professionals will effectively pay four times more NI on their pension savings above the threshold than the highest earners.

So, rather than levelling the playing field, the salary sacrifice cap introduces what can only be described as a ‘middle income trap’.

The death of the employer pension top-up

Salary sacrifice arrangements have long delivered mutual benefits. Employers save on their NI contributions, and many then choose to share some or all those savings by ‘topping up’ employees’ pension pots.

The introduction of a 15% employer NI charge on contributions above the £2,000 cap turns that upside down. For many businesses, and particularly SMEs operating on tight margins, continuing to offer these free top-ups will become financially unviable. This creates an ‘efficiency cliff’.

Employees not only face a NI charge on their contributions above the cap but also stand to lose employer top-ups worth up to 15%. For low earners, this represents a combined potential 23% reduction in the overall efficiency of pension savings above the cap.

Over time, this may reduce participation in salary sacrifice schemes altogether, weakening a system that has played a key role in improving retirement outcomes.

The stealth hit to the ‘protected majority’

The government says 7.7 million employees in the UK are currently using the salary sacrifice scheme to pay into their pension pots. Its figures suggest that 56% of employees using salary sacrifice arrangements will be unaffected by the changes because their contributions fall below the £2,000 threshold. However, this overlooks how employer costs are absorbed in the labour market.

The Office for Budget Responsibility (OBR) has indicated that around 76% of increased employer costs are typically passed on to employees through lower wage growth and reduced employer pension contributions. This means that even those below the cap will not be ‘fully protected’.

The impact will be felt through reduced pay increases, scaled-back benefits and the gradual closure of employer pension enhancements. In essence, this means the policy operates as a stealth tax, extending its reach far beyond those individuals exceeding the £2,000 cap.

A ‘perfect storm’ for SMEs

The timing of the policy adds further complexity. The cost of simply having staff is soaring as businesses grapple with a series of cost pressures, including the rollout of new ‘day one’ statutory sick pay (SSP) rules, wider changes under recent employment rights legislation, and increased regulatory scrutiny with the launch of the Fair Work Agency (FWA).

Against this backdrop, the introduction of additional NI costs on pension contributions creates a difficult trade-off for employers. They need to review whether they ultimately absorb the extra costs, squeeze pension benefits or offset the financial impact by suppressing wage growth.

The risk, particularly for SMEs, is that salary sacrifice arrangements become less attractive or are withdrawn entirely. Of course, this would disproportionately disadvantage lower and middle income employees – the very individuals who benefit most from retirement savings incentive arrangements.

What pension savers should consider

• Consider increasing contributions or making salary sacrifice lump sum payments under the current rules (if your funds allow), as the changes don’t apply until April 2029. Ensure you stay within the annual allowance limits and don’t reduce salary below the national minimum wage.

• Calculate the net impact of continuing salary sacrifice contributions above the threshold. For most earners, the tax efficiency of a pension will still outperform alternative investment vehicles.

• Consider alternative tax-efficient savings vehicles, such as ISAs, to complement pension contributions.

• Engage with your employer or pension provider to understand how the workplace scheme may change ahead of implementation.

• Remember that despite the changes, pensions remain one of the most tax-efficient long-term investments. The basic tax relief framework and tax-free growth within pensions remain unchanged.

• Consult a qualified tax specialist or financial adviser to help you determine the most efficient strategy and ensure your long-term retirement goals remain on track.

What businesses should do now

• Assess the financial impact of the cap on payroll, employer NI liabilities and overall employee benefit strategies by modelling patterns in your workforce.

• Review the sustainability of pension top-up policies and salary sacrifice arrangements.

• Remember the benefit of salary sacrifice schemes is unchanged when employees pay in less than £2,000 a year. Below this level, there are still NI savings available for employer and employee.

• Communicate clearly with employees about potential changes to avoid confusion or mistrust and support financial wellbeing.

• Consider broader reward restructuring, balancing pensions, salary and other benefits to remain competitive in attracting and retaining talent.

• Speak to a specialist financial adviser or tax adviser to help identify tax efficiencies and planning opportunities to ease the financial pressure.

Looking ahead to 2029

The £2,000 cap risks doing the opposite of what was promised: it shields the highest earners while loading complexity and cost onto the middle of the labour market. Unless employers and savers act early, a policy billed as a fair tax on the wealthy could quietly erode pension generosity, widen inequality in retirement, and weaken confidence in the UK’s workplace savings system.

About the author

Adele Clapp, tax director at Bishop Fleming