For employers reviewing a salary sacrifice pension, often called pension salary exchange, National Insurance (NI) savings are only part of the decision.
Employers also need to decide whether that saving is retained, used to increase pension contributions or split between the two.
From 2029/30, new rules will limit the amount of salary or bonus that can be exchanged for pension contributions before Class 1 NI applies. Reward, HR and pension teams therefore need to understand the current savings, decide how it fits contribution strategy and prepare for the change.
How salary sacrifice pensions work
Under pension salary sacrifice, an employee gives up part of their cash salary or bonus and the employer pays a corresponding amount into the pension as an employer contribution.
Because this changes contractual cash pay, the arrangement needs to be documented correctly.
Salary sacrifice sits alongside automatic-enrolment duties rather than replacing them. Pension membership cannot depend on an employee agreeing to salary sacrifice.
Under current rules, salary exchanged for an employer pension contribution can reduce the pay on which employee and employer NI is due.
For 2026/27, the standard employer Class 1 NI rate is 15% above the £5,000 annual secondary threshold. For a typical category A employee, NI is 8% between £12,570 and £50,270 and 2% above this.
Where the full amount exchanged would otherwise attract employer NI, every £1,000 exchanged can reduce employer NI by £150.
Actual savings depend on earnings, NI category and any employer reliefs.
What can an employer save today?
These examples assume a 5% salary exchange, a 15% employer NI rate and that the full amount exchanged would otherwise be subject to employer NI.
| Gross salary | 5% salary exchanged | Illustrative employer NI saving |
| £25,000 | £1,250 | £187.50 |
| £40,000 | £2,000 | £300 |
| £60,000 | £3,000 | £450 |
For 100 employees earning £40,000 and each exchanging 5% of salary, the illustrative gross employer NI saving would be £30,000 a year.
Employers also need to consider contribution levels, administration, employee communication and the wider benefits budget.
What changes from April 2029?
From the 2029/30 tax year, salary or bonus exchanged for pension contributions above an annual £2,000 limit will be brought into Class 1 employee and employer NI.
Salary sacrifice will remain available above £2,000, but the excess will no longer receive the same NI treatment. The change does not remove the Income Tax treatment of pension contributions.
Ordinary employer pension contributions that are not generated through salary sacrifice will continue to be free of NI.
Using the current 15% employer NI rate for illustration, £2,000 of salary exchange would produce an employer NI saving of £300 per employee. The actual figure from 2029 will depend on the NI rates and detailed rules then in force.
For example, consider an employee earning £45,000 who exchanges 8% of salary, or £3,600 a year:
| Scenario | Amount receiving NI exemption | Illustrative employer NI saving at 15% |
| Current rules | £3,600 | £540 |
| 2029/30 rules, using the £2,000 limit | £2,000 | £300 |
| Illustrative reduction | £1,600 no longer covered | £240 |
Where an employer links enhanced pension contributions to its NI saving, the contribution formula or budget may need to change.
Further operational detail is expected before April 2029.
How can employers use the NI saving?
The main options are to retain the saving, reinvest it into pensions or split it between the two.
| Approach | When it may fit | What to test |
| Retain the saving | The priority is employment-cost control or funding the wider benefits budget | How much value remains after 2029; whether existing communications or commitments imply the saving will be shared |
| Reinvest it into pensions | The organisation wants more of the saving to support retirement contributions | Who receives the enhancement; whether it is fixed or linked to actual NI savings; affordability after 2029 |
| Split the saving | The employer wants to balance cost control with additional pension value | Whether the formula is understandable across salary bands; payroll complexity; how future NI changes affect the split |
The starting point is the employer’s contribution objective.
Retaining some of the saving may support cost efficiency. Reinvesting some or all of it may support higher pension contributions. A split approach can combine the two but adds another rule for payroll and employees to understand.
How salary sacrifice fits different workplace pension routes
Salary sacrifice is a contribution mechanism rather than a pension product.
It can operate alongside different workplace pension arrangements, subject to scheme rules, provider processes and automatic-enrolment requirements.
| Pension route | Questions for the employer |
| Single-employer trust-based DC scheme | Do the scheme rules support salary sacrifice? Which definition of pensionable pay is used? Who owns payroll and trustee changes? |
| Master trust pension | What payroll data is required? How will contributions above the 2029 limit be identified and reported? |
| Contract-based group personal pension (GPP) | How do employer and provider processes interact? How are contribution changes communicated and reconciled? |
| Other occupational arrangements, including DB or hybrid schemes | Could reduced contractual salary affect pensionable salary or benefit accrual? Is actuarial or legal input needed? |
Automatic-enrolment requirements still apply.
For DC schemes, employers should check how post-sacrifice earnings interact with the contribution basis used by their scheme.
What employee impacts should employers consider?
Salary sacrifice can be useful, but it is not suitable in every case.
- Minimum wage: salary sacrifice cannot reduce cash earnings below the National Minimum Wage. From 1 April 2026, the National Living Wage is £12.71 an hour for workers aged 21 and over.
- Statutory payments: lower contractual cash earnings can affect average weekly earnings used for some statutory payments, including Statutory Maternity Pay, Statutory Paternity Pay and Statutory Adoption Pay. Employers should check the current rules rather than applying one assumption across every payment.
- Borrowing: some lenders may assess contractual salary differently when considering affordability. Employee communications should flag the possibility rather than promise a particular outcome.
- Pension tax limits: the standard annual allowance is £60,000 for 2026/27, while a tapered annual allowance can apply to higher earners. Individual circumstances may require regulated or tax advice.
These points should be reflected in scheme design and employee communications.
Questions to put to a pension or payroll provider
Useful questions include:
- How will payroll identify and report salary exchange above the £2,000 annual limit from 2029/30?
- Can employees join, leave or change salary sacrifice during the tax year?
- How are pensionable pay and automatic-enrolment minimums calculated after sacrifice?
- What National Minimum Wage controls are built into payroll?
- How are employer NI savings reported?
- Can the system support retaining, reinvesting or splitting the saving?
- What support is available for contract changes and employee communications?
- How will the process adapt when the remaining 2029 operational rules are confirmed?
These questions help employers assess how the arrangement will work in practice, not simply the headline NI saving.
Build the contribution strategy around the outcome, not just the saving
Salary sacrifice should be assessed as part of the wider pension contribution strategy, not simply as a source of employer NI savings.
Ahead of 2029, employers need to model the effect of the £2,000 limit, decide how any remaining NI saving will be retained or reinvested, and confirm that payroll can support the new rules.
The Employee Benefits & Rewards Forum brings senior HR, Reward and Benefits professionals together with relevant pension and payroll providers through pre-arranged one-to-one meetings.
Organisations reviewing salary sacrifice, pension contribution strategy or payroll readiness for 2029 can meet pension and payroll providers against those requirements.
Frequently asked questions
Is salary sacrifice the same as salary exchange?
Usually, yes. In workplace pensions, “salary sacrifice”, “salary exchange” and “pension salary exchange” commonly describe an employee giving up part of cash pay in return for an employer pension contribution. HMRC generally uses salary sacrifice, while some providers prefer salary exchange.
Does the 2029 limit affect ordinary employer pension contributions?
No, not in the same way. The government has confirmed that ordinary employer pension contributions will continue to be free of NI. The new rules bring salary or bonus forgone through salary sacrifice above the annual contribution limit into Class 1 employee and employer NI.
Do employers have to pass their NI saving to employees?
No general salary-sacrifice rule requires an employer to pass its NI saving into the employee’s pension. Employers can retain it, reinvest it or use a defined split, subject to scheme rules, contractual commitments and the policy communicated to employees.
Can salary sacrifice be used with a master trust?
Potentially, yes. Salary sacrifice can operate alongside a master trust where the scheme and provider processes support it. Employers should confirm the contribution basis, payroll requirements, automatic-enrolment compliance and how the 2029 limit will be administered.
This article provides general information for employers and is not tax, legal, pensions or financial advice. Employers should take appropriate professional advice before changing employment terms, payroll processes or pension scheme design.
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