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Income tax, National Insurance and net pay for any UK salary, 2026-27.
The employer rate of National Insurance rose to 15% on 6 April 2026, and it now applies to earnings above a Secondary Threshold of just £5,000 a year [1]. Salary sacrifice is the main structural lever a UK employer has to reduce that cost, and it has moved from a niche perk to a mainstream payroll decision.
A salary sacrifice arrangement is an agreement to reduce an employee's contractual cash pay in return for a non-cash benefit, most often a pension contribution [2]. Because the sacrificed amount is never paid as salary, it never enters the National Insurance calculation, so both the employer and the employee pay less. The arrangement is legitimate, long-established and specifically accommodated in HMRC guidance, but it carries conditions that a payroll team has to get right.
This article sets out what salary sacrifice is, how it changes the numbers on a payslip, which benefits keep their tax and National Insurance advantages, the rules that cap it, and the reform to pension salary sacrifice that takes effect from April 2029. The figures used throughout are drawn from the 2026-27 tax year.
Key takeaways
- Salary sacrifice reduces an employee's gross contractual pay, so the sacrificed amount escapes both employer and employee National Insurance.
- The employer saves National Insurance at 15% on every pound sacrificed, and the employee saves at 8% on earnings inside the main band.
- Only a short list of benefits keeps full tax and National Insurance relief, led by pension contributions.
- A sacrifice can never take cash pay below the National Minimum Wage, and it can reduce statutory pay and some state benefits.
- From April 2029, only the first £2,000 of pension contributions made through salary sacrifice each year will be free of National Insurance.
What salary sacrifice is
Salary sacrifice is a contractual change, not a payroll trick. The employee gives up a defined part of their cash salary, and the employer provides an agreed non-cash benefit of equivalent value in its place [3]. The reduced figure becomes the employee's new contractual salary for the duration of the arrangement, which is why the calculation that follows treats the sacrificed amount as pay that was never earned.
HMRC does not approve individual schemes in advance, and employers cannot ask for a ruling on a proposed arrangement before it is in place [4]. The responsibility for operating the arrangement correctly sits with the employer, which makes the contractual and payroll mechanics the part that most often goes wrong.
The contractual mechanics
For a sacrifice to be effective, the employee's contract must be varied so that the reduced cash pay is the genuine contractual entitlement, and the contract must state the cash and non-cash entitlements at any given point [5]. An arrangement that lets the employee swap freely between cash and the benefit whenever they choose fails the test, and the expected tax and National Insurance advantages are lost [6].
HMRC guidance recognises that life events can trigger a change, so a scheme can allow variations after events such as marriage, divorce, redundancy of a partner or pregnancy without breaking the arrangement [7]. The practical rule for payroll is that each change is a contractual variation, recorded and dated, rather than an informal adjustment made at the point of running the payrun [8].
Why the National Insurance saving is the engine
Income tax relief on a pension contribution is available whether or not salary sacrifice is used, because a normal personal contribution already attracts tax relief. The feature that salary sacrifice adds is the National Insurance saving, because the sacrificed pay is removed from the earnings on which National Insurance is charged [9].
That saving falls on both sides of the payroll. The employer no longer pays its 15% secondary National Insurance on the sacrificed amount, and the employee no longer pays primary National Insurance on it at 8% inside the main earnings band [10]. For an employer running payroll on HMRC-recognised payroll software, the two savings are produced automatically from the reduced contractual figure, with no separate adjustment needed.
How salary sacrifice changes the payroll calculation
The clearest way to see the effect is to compare the same pension contribution made as a normal employee deduction and as a salary sacrifice. Consider an employee on £36,000 a year who wants £2,400 a year, that is £200 a month, to go into a workplace pension.
The table below compares the National Insurance outcome of the two routes, using the 2026-27 rates of 15% for the employer and 8% for the employee inside the main band.
| Route | Sacrificed from gross pay | Employer NI on the £2,400 | Employee NI on the £2,400 |
|---|---|---|---|
| Normal employee pension contribution | No | £360 paid | £192 paid |
| Salary sacrifice into pension | Yes | £0 (saves £360) | £0 (saves £192) |
The combined National Insurance saving on a single £2,400 contribution is £552 a year, split £360 to the employer and £192 to the employee [11]. On a larger one-off, the effect is sharper still: a £5,000 bonus sacrificed entirely into a registered pension attracts no income tax and no employee National Insurance, and the full amount reaches the pension fund [12].
The employer National Insurance saving
The employer saving scales directly with the pay bill that passes through sacrifice. At 15%, every £10,000 of salary sacrificed across a workforce removes £1,500 of employer National Insurance [13]. This is why the 6 April 2026 rate rise, from 13.8% to 15%, pushed salary sacrifice up the agenda for finance teams: the lever became more valuable at exactly the moment the cost it offsets grew.
Many employers recycle part of the saving by passing some or all of their National Insurance reduction back into the employee's pension, which raises the total going into the fund at no extra cost to the business [14]. The decision on whether to do so is the employer's, and it should be documented in the scheme rules so that payroll applies it consistently [15].
The employee tax and National Insurance saving
For the employee, the headline gain is the National Insurance that is no longer due on the sacrificed pay, charged at 8% inside the main band between the Primary Threshold of £12,570 and the Upper Earnings Limit of £50,270, and at 2% above that [16]. Income tax relief at the employee's marginal rate, 20%, 40% or 45% depending on the band, applies through the pension contribution in the normal way [17].
There is a secondary effect that matters for higher earners. Because salary sacrifice reduces gross taxable pay, it can keep an employee below the £100,000 point at which the Personal Allowance begins to taper away, and below the £50,270 higher-rate threshold [18]. A payroll team advising on this stays factual: the arrangement changes the taxable figure, and the employee should take their own advice on the wider consequences.
Which benefits keep their tax and National Insurance advantages
Salary sacrifice can in principle be offered against many benefits, but most benefits are taxed on their value regardless of the sacrifice, so the advantage disappears. HMRC guidance lists a short set of benefits that need no valuation and no reporting because they retain full relief [19].
The table below sets out that qualifying list and the condition attached to each.
| Benefit | Relief retained under sacrifice | Key condition |
|---|---|---|
| Registered pension scheme contributions | Full tax and NI relief | Subject to annual and lifetime pension limits |
| Employer-provided pensions advice | Full relief | Up to the £500 annual exemption |
| Workplace nurseries | Full relief | Must meet the workplace nursery conditions |
| Childcare vouchers or employer-contracted childcare | Full relief | Only where the arrangement began on or before 4 October 2018 |
| Cycles and cycling safety equipment | Full relief | Must meet the cycle to work conditions |
Any benefit outside this list is caught by the valuation rules described in the next section, so the National Insurance advantage is removed [20].
Pension contributions, the dominant use
Pension salary sacrifice is by far the most common form, because a pension contribution attracts full tax and National Insurance relief and sits at the centre of auto-enrolment. Under auto-enrolment, the statutory minimum is 8% of qualifying earnings, made up of at least 3% from the employer and the balance from the employee [21]. Routing the employee's share through sacrifice turns part of that mandatory contribution into a National Insurance saving for both parties [22].
Employers should confirm how the scheme treats a sacrificed salary, because many pension schemes base contributions on a notional pre-sacrifice salary rather than the reduced figure, and the provider should be asked which it uses [23]. Where auto-enrolment assessment and sacrifice interact on the same payrun, SME payroll software that evaluates qualifying earnings every period keeps the two aligned [24].
Workplace nurseries, pensions advice and cycling equipment
Employer-provided pensions advice is exempt up to £500 for each employee each tax year, and the exemption survives a salary sacrifice arrangement [25]. Workplace nurseries keep their relief where the nursery meets the statutory conditions, which is a narrower benefit than the closed childcare voucher route [26].
Cycles and cycling safety equipment remain a popular qualifying benefit, because the loan of a cycle for an employee's commute keeps full tax and National Insurance relief under the cycle to work conditions [27]. As with every other qualifying benefit, the sacrifice has to respect the National Minimum Wage floor discussed below, which is the constraint cycle schemes most often bump against for lower-paid staff [28].
The optional remuneration arrangement rules
The relief on most non-pension benefits was tightened by the optional remuneration arrangement rules, usually shortened to OpRA. Understanding them explains why the qualifying list above is so short.
What OpRA changed from 6 April 2017
From 6 April 2017, where a benefit is provided through salary sacrifice or a similar arrangement, it is taxed on the higher of the cash forgone or the normal benefit-in-kind value [29]. In practice this removes the National Insurance advantage from most benefits, because the sacrificed salary is brought back into charge even though it was not paid as cash [30].
The pension, pensions advice, workplace nursery, childcare and cycle to work benefits are specifically carved out of OpRA, which is why they alone keep full relief [31]. For a payroll team, the OpRA rule is the reason a car, a phone or a gym membership offered through sacrifice no longer produces the saving it once did [32].
Electric cars, the surviving car exemption
Ultra-low emission and zero-emission cars are the notable exception within OpRA, because a car with CO2 emissions of no more than 75g/km is always valued under the normal benefit-in-kind rules rather than the higher cash-forgone figure [33]. For a fully electric car, the benefit-in-kind appropriate percentage is low and rising gradually, set at 3% for the 2025-26 tax year, 4% for 2026-27 and 5% for 2027-28 [34].
That combination, a protected valuation method and a low appropriate percentage, is what keeps electric car salary sacrifice attractive while other car benefits lost their advantage. The arrangement still generates a Class 1A National Insurance charge on the taxable benefit, which the employer reports in the usual way, so the saving is real but smaller than a straight pension sacrifice [35].
The limits every employer must respect
Salary sacrifice is bounded by two hard constraints that a payroll team cannot override: the National Minimum Wage, and the knock-on effect on earnings-linked payments.
National Minimum Wage floor
A salary sacrifice must never reduce an employee's cash earnings below the National Minimum Wage or National Living Wage that applies to them [36]. Because the sacrifice reduces cash pay, it is the reduced figure, not the headline salary, that is measured against the minimum wage, and a sacrifice that breaches the floor makes the employer non-compliant [37].
The practical consequence is that lower-paid workers have little or no room to sacrifice, and the employer must cap the deduction so that pay stays above the statutory rate in every pay reference period [38]. An employer running this across several schemes, or an accountant managing it for multiple clients, needs the cap enforced automatically rather than checked by hand each month [39].
Statutory pay and state benefit knock-on effects
Because salary sacrifice lowers the earnings on which statutory payments are calculated, it can reduce the amount an employee receives, or remove the entitlement entirely if average weekly earnings fall below the Lower Earnings Limit [40]. This matters most around parental leave, because Statutory Maternity Pay and the other family payments are based on average weekly earnings in a set reference period [41].
Reduced National Insurance earnings can also affect contribution-based state benefits and the earnings record that underpins the State Pension, since the employee may pay less or no National Insurance on the sacrificed pay [42]. A careful employer flags these effects to staff before they join a scheme, and some suspend sacrifice during a maternity reference period to protect the statutory calculation [43].
The April 2029 pension salary sacrifice reform
The most significant change on the horizon is a cap on the National Insurance advantage of pension salary sacrifice, announced for April 2029.
What changes and what stays the same
From April 2029, only the first £2,000 of employee pension contributions made through salary sacrifice each year will be exempt from National Insurance [44]. Employee contributions above £2,000 made this way will be subject to both employer and employee National Insurance, in the same way as other employee workplace pension contributions [45].
Two things are left untouched. Employer pension contributions remain free of National Insurance without a cap, and salary sacrifice pension contributions continue to be exempt from income tax subject to the usual limits [46]. The government's stated rationale is that the relief has grown and that its cost falls disproportionately on higher earners, so most employees making typical contributions are unaffected [47].
What employers should do to prepare
The reform is administered through payroll, so employers will have to report the total amount each employee sacrifices and apply National Insurance to the portion above £2,000 [48]. HMRC has said it will publish detailed guidance before the start date, and that employers, not employees, will make the necessary payroll changes [49].
For a platform embedding UK payroll, the change is a schema and calculation update rather than a redesign, because the sacrifice mechanism itself is unchanged and only the National Insurance treatment above a threshold is new. A payroll API that already tracks sacrificed amounts per employee can apply the cap by comparing the running annual total against £2,000, which is the kind of rule an HMRC-recognised engine is built to absorb [50].
Work out the true cost of a salary after sacrifice
An employer sizing the effect of a sacrifice on take-home pay and on employer cost can model it with the Moonworkers UK salary calculator, which applies the 2026-27 PAYE and National Insurance rules to any gross figure.
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About this calculator
This calculator gives you a close estimate of your UK payroll deductions for 2026-27, using HMRC's exact percentage method with periodised thresholds. It handles the three tax territories, K codes with the 50% regulatory limit and its carry-forward, weeks 53, 54 and 56, the cumulative and W1/M1/X bases, student and postgraduate loans, and pension contributions on qualifying earnings. It still won't match your payslip to the penny in every case: it does not cover in-year tax code changes, payrolled benefits in kind, NI deferral across more than one employment, directors on the annual earnings period, or employer-level annual adjustments such as the Employment Allowance and the apprenticeship levy. Powered by the same engine as the Moonworkers Payroll API.
Frequently asked questions
Why might the result differ from my payslip?
This calculator uses your current gross pay and tax code to produce an estimate. K-code carry-forwards and weeks 53, 54 and 56 are handled, and the Year-to-date section reproduces a specific period exactly. What your employer may apply that this does not: a mid-year tax code change, benefits in kind processed through payroll, or NI deferral across more than one employment. For most employees on a standard tax code the difference is negligible.
What tax code should I enter?
Use the tax code shown on your most recent payslip or the PAYE Coding Notice (P2) from HMRC. If you're not sure, 1257L is the standard code for most employees resident in England, Wales, or Northern Ireland. Use S1257L for Scotland or C1257L for Wales if you pay Scottish or Welsh income tax.
Which NI category applies to me?
Most employees use Category A. Use M if you are under 21, H if you are an apprentice under 25, or C if you are over State Pension age. Your employer is responsible for assigning the correct category — if in doubt, check your payslip.
Which student loan plan am I on?
Your plan depends on when and where you studied. Plan 1 covers students who started before September 2012. Plan 2 is for English and Welsh students who started from September 2012 to July 2023. Plan 5 applies to English students who started from August 2023. Plan 4 covers Scottish students. You can check your plan at gov.uk or on your payslip.
What is the YTD cumulative PAYE mode?
HMRC's standard method calculates income tax on your total earnings to date each period, then subtracts tax already paid. If you're mid-year and want to see exactly what tax should be deducted in a specific period, expand the Year-to-date section and enter your running totals from previous periods only.
Conclusion
Salary sacrifice is a contractual reduction in pay that removes the sacrificed amount from the National Insurance calculation, and the 15% employer rate makes that reduction more valuable than at any point in the past decade. The arrangement works cleanly for pension contributions and a short list of carved-out benefits, and the optional remuneration arrangement rules explain why almost everything else lost its advantage after 6 April 2017.
The direction of travel is now clear. The April 2029 cap signals that the National Insurance advantage on pension sacrifice will be contained rather than removed, and the administrative burden of applying it will sit in payroll. Employers who treat salary sacrifice as a payroll process, with proper contracts, a minimum wage cap and automated reporting, rather than as an informal perk, are the ones who will carry the reform without disruption.
Frequently asked questions
Does salary sacrifice reduce how much National Insurance an employer pays?
Yes. The sacrificed amount is removed from the employee's gross pay, so the employer does not pay its 15% secondary National Insurance on it. On £2,400 sacrificed into a pension, an employer saves £360 a year, and the saving scales with the total pay bill passing through sacrifice.
Can salary sacrifice take an employee below the minimum wage?
No. A salary sacrifice must never reduce cash earnings below the National Minimum Wage or National Living Wage that applies to the employee. The reduced figure is what counts, so lower-paid workers may have little or no room to sacrifice, and the employer must cap the deduction in every pay period.
Which benefits still save National Insurance under salary sacrifice?
A short list keeps full relief: registered pension contributions, employer-provided pensions advice up to £500 a year, workplace nurseries, childcare arrangements that began on or before 4 October 2018, and cycles and cycling safety equipment. Ultra-low emission and electric cars also keep an advantage because they are valued under the normal benefit-in-kind rules rather than the higher cash-forgone figure.
What is changing for pension salary sacrifice in April 2029?
From April 2029, only the first £2,000 of employee pension contributions made through salary sacrifice each year will be free of National Insurance. Contributions above that level will attract both employer and employee National Insurance. Income tax relief is unchanged, and employer contributions remain outside National Insurance without a cap.
