Why does my employer use net pay arrangement instead of salary sacrifice?

Most large occupational pension schemes (NHS, USS, LGPS, Civil Service, BT) run on a net pay arrangement because that is how they have been structured for decades and changing the basis is administratively complex. Salary sacrifice requires the employer to formally vary the employment contract for each participant and to recalculate gross pay for every other purpose (mortgage references, P60s, statutory payments). Many private-sector employers do now offer SS, but it usually has to be opted into rather than being the default.

Can I switch from relief at source to salary sacrifice?

Only if your employer operates an SS scheme. If they do, the switch is a contractual variation - your gross salary is reduced, the employer pays the corresponding amount directly into the pension, and you stop making employee contributions out of net pay. You typically need to commit for at least 12 months under HMRC's salary-sacrifice rules to avoid the arrangement being treated as ineffective. If your employer does not offer SS at all (common in small firms and most public sector roles), you cannot switch unilaterally - the pension scheme is what it is.

How do I claim the extra 20% relief on RAS as a higher-rate taxpayer?

Through Self Assessment if you already file one, or by writing to HMRC (you can do it through your Personal Tax Account at gov.uk) with the gross contribution amount and a copy of the pension statement. HMRC then either issues a refund, adjusts your tax code so you take home more during the year, or both. For higher-rate taxpayers the extra reclaim is 20% of the gross contribution (so £800 on a £4,000 contribution); for additional-rate taxpayers it is 25% (£1,000). Many higher-rate RAS savers forget to claim and lose out on years of relief - the time limit is 4 years.

Does salary sacrifice affect Statutory Maternity Pay or my mortgage application?

Yes - this is the main practical downside. SMP is calculated on the lower post-sacrifice salary (the first six weeks at 90% of average weekly earnings can be materially lower), and most mortgage lenders use post-sacrifice gross as the affordability figure (some specialist lenders consider the pension contribution as discretionary income, but they are not the default). Net pay arrangement and relief at source do not have this side effect because gross salary is unchanged. If you are planning to take maternity leave or apply for a mortgage within 12 - 18 months, it is worth pausing or reducing salary sacrifice contributions.

Does the £260,000 adjusted income annual allowance taper apply to all three methods?

Yes - the £60,000 annual allowance and the taper that reduces it down to £10,000 once adjusted income exceeds £260,000 apply equally to salary sacrifice, net pay, and relief at source contributions. HMRC counts the total employer + employee gross contribution against the limit regardless of method. The taper is on adjusted income (broadly: taxable income plus employer pension contributions including salary-sacrificed amounts), so SS does not let you sidestep the taper - the sacrificed amount is added back when calculating adjusted income.

What happens to my contributions if I leave my employer mid-year?

Salary sacrifice and net pay contributions stop the day employment ends - they only exist while you are on payroll. Relief at source contributions through a personal pension or SIPP carry on regardless of employment status, and you can keep contributing from new earnings or savings. All three pots stay invested under your name and can be transferred to a new employer scheme or consolidated into a SIPP. The basic-rate top-up on RAS is available even if you have zero earnings in the year, up to £3,600 gross (£2,880 net) - the only relief route that works for non-earners.

Salary Sacrifice vs Relief at Source UK (2026/27)

UK workplace pensions deliver tax relief through one of three mechanisms: salary sacrifice, net pay arrangement, or relief at source. They produce different take-home pay, different cash-flow timing, and - in the case of salary sacrifice - different total relief, because only SS escapes National Insurance as well as Income Tax. This page compares all three on an identical £4,000 gross contribution across four salary bands, with figures computed by the same engine that drives the salary calculator.

The three UK pension tax-relief methods

Salary sacrifice (SS) - the employee contractually gives up part of their gross salary in exchange for the employer making a corresponding pension contribution. The sacrificed amount never reaches payroll as taxable income, so it escapes both Income Tax (20% / 40% / 45%) and employee National Insurance (8% on the main band, 2% above the Upper Earnings Limit). The employer also saves their 15% Class 1 Secondary NI on the sacrificed amount and frequently rebates some or all of that saving into the employee's pension pot.
Net pay arrangement (NPA) - the employee contribution is deducted from gross pay before Income Tax is calculated, but after National Insurance is calculated. Saves IT at the marginal rate, does not save NI. Standard for most occupational defined-benefit schemes (NHS, Teachers', LGPS, USS, Civil Service) and many large DC master-trusts. Relief is automatic and immediate - no claim required.
Relief at source (RAS) - the employee contribution is deducted from net pay (post-Income-Tax, post-NI). The pension provider then claims 20% basic-rate relief directly from HMRC and adds it to the pot - so a £3,200 net contribution becomes £4,000 gross. Higher-rate (40%) and additional-rate (45%) taxpayers must reclaim the extra 20% / 25% through Self Assessment or by writing to HMRC. The one structural advantage: non-taxpayers (people earning below the £12,570 Personal Allowance) still get the 20% top-up on contributions up to £3,600 gross per year.

Worked example: £4,000 pension contribution at each salary band

Identical £4,000 gross-equivalent contribution into a UK registered pension. All figures computed by the salary engine on 2026/27 HMRC rates, England rest-of-UK bands. "Net cost" is the actual reduction in take-home pay (after any SA refund); "Effective relief" is the saved fraction of the £4,000 gross contribution.

Salary	Method	Net cost	Pension	Relief
£40,000 Basic rate (20% IT, 8% NI)	Salary sacrifice	£2,880	£4,000	28.0%
	Net pay arrangement	£3,200	£4,000	20.0%
	Relief at source	£3,200	£4,000	20.0%
£60,000 Higher rate (40% IT, 2% NI)	Salary sacrifice	£2,320	£4,000	42.0%
	Net pay arrangement	£2,400	£4,000	40.0%
	Relief at source	£2,400	£4,000	40.0%
£100,000 Higher rate, just below PA taper	Salary sacrifice	£2,320	£4,000	42.0%
	Net pay arrangement	£2,400	£4,000	40.0%
	Relief at source	£2,400	£4,000	40.0%
£130,000 Additional rate (45% IT, 2% NI)	Salary sacrifice	£2,120	£4,000	47.0%
	Net pay arrangement	£2,200	£4,000	45.0%
	Relief at source	£2,200	£4,000	45.0%

Note: NPA and RAS produce the same total relief at every salary band shown because both eventually deliver IT relief at the marginal rate. They differ in cash-flow timing - NPA relief is automatic and immediate at payroll; RAS relief above the basic rate has to be claimed back through Self Assessment, which can take 6 - 18 months.

Why salary sacrifice wins (almost always)

SS is structurally more tax-efficient than the other two because it escapes employee National Insurance as well as Income Tax. The gap ranges from 8 percentage points at basic rate to ~2 percentage points at additional rate, but it compounds over a 30 - 40 year contributing career. On a single £4,000 contribution:

At £40,000 gross, SS net cost is £2,880, NPA/RAS net cost is £3,200 - SS keeps an extra £320 in your pocket (8.0 pp more relief).
At £60,000 gross, SS net cost is £2,320, NPA/RAS net cost is £2,400 - SS keeps an extra £80 in your pocket (2.0 pp more relief).
At £100,000 gross, SS net cost is £2,320, NPA/RAS net cost is £2,400 - SS keeps an extra £80 in your pocket (2.0 pp more relief).
At £130,000 gross, SS net cost is £2,120, NPA/RAS net cost is £2,200 - SS keeps an extra £80 in your pocket (2.0 pp more relief).

On top of that, many employers rebate part or all of their 15% Class 1 Secondary NI saving into the employee's pension pot - a "100% NI rebate" scheme adds an extra £600 to a £4,000 sacrifice pot, lifting the effective relief well above the figures shown in the table. Always ask payroll whether your scheme includes an employer NI rebate - it is one of the highest-return uplifts available in UK employment compensation.

When RAS still makes sense

RAS is the right method (or the only available method) in several common situations:

Low earners below the Personal Allowance - someone earning £10,000 a year pays no Income Tax, so NPA gives them zero relief. RAS still adds the 20% basic-rate top-up at source (up to £3,600 gross / £2,880 net per year). This is the single biggest structural advantage of RAS over NPA and was the focus of HMRC's "net pay anomaly" correction announcement in 2023.
Non-employer SIPP contributions - personal pensions and SIPPs (Vanguard, AJ Bell, Hargreaves Lansdown, etc.) run exclusively on RAS. If you are contributing from after-tax savings rather than payroll, RAS is the only mechanism available to you.
Employer does not offer salary sacrifice - many small-firm workplace pensions and some master-trusts only offer RAS. There is no way to manufacture salary sacrifice unilaterally; if it is not on offer, RAS (or NPA, depending on the scheme) is what you have.
You need the gross salary figure preserved - because RAS does not reduce contractual gross pay, it leaves mortgage affordability, Statutory Maternity Pay, life cover, and State Pension entitlement (NI credits) all calculated on the full pre-contribution salary. SS sacrifices some of those for tax efficiency; RAS is the cleanest middle ground.

The £60,000 Annual Allowance applies to all three

Regardless of which relief method delivers the contribution, every pound paid into a UK registered pension counts toward the Annual Allowance - £60,000 of gross contributions per tax year in 2026/27, with a three-year carry-forward of any unused allowance from the previous three tax years. The allowance tapers down to a floor of £10,000 once adjusted income exceeds £260,000: it falls by £1 for every £2 of adjusted income above the threshold. The taper cannot be sidestepped by using salary sacrifice - HMRC adds the sacrificed amount back into adjusted income before applying the taper, by design.

Exceeding the annual allowance creates an Annual Allowance Charge: the excess is added to taxable income and taxed at your marginal rate, effectively clawing back the relief you would otherwise have received. The charge can sometimes be paid out of the pension itself ("Scheme Pays") rather than from cash, but the practical limit is the same regardless of contribution method.

Frequently asked questions

Why does my employer use net pay arrangement instead of salary sacrifice?: Most large occupational pension schemes (NHS, USS, LGPS, Civil Service, BT) run on a net pay arrangement because that is how they have been structured for decades and changing the basis is administratively complex. Salary sacrifice requires the employer to formally vary the employment contract for each participant and to recalculate gross pay for every other purpose (mortgage references, P60s, statutory payments). Many private-sector employers do now offer SS, but it usually has to be opted into rather than being the default.
Can I switch from relief at source to salary sacrifice?: Only if your employer operates an SS scheme. If they do, the switch is a contractual variation - your gross salary is reduced, the employer pays the corresponding amount directly into the pension, and you stop making employee contributions out of net pay. You typically need to commit for at least 12 months under HMRC's salary-sacrifice rules to avoid the arrangement being treated as ineffective. If your employer does not offer SS at all (common in small firms and most public sector roles), you cannot switch unilaterally - the pension scheme is what it is.
How do I claim the extra 20% relief on RAS as a higher-rate taxpayer?: Through Self Assessment if you already file one, or by writing to HMRC (you can do it through your Personal Tax Account at gov.uk) with the gross contribution amount and a copy of the pension statement. HMRC then either issues a refund, adjusts your tax code so you take home more during the year, or both. For higher-rate taxpayers the extra reclaim is 20% of the gross contribution (so £800 on a £4,000 contribution); for additional-rate taxpayers it is 25% (£1,000). Many higher-rate RAS savers forget to claim and lose out on years of relief - the time limit is 4 years.
Does salary sacrifice affect Statutory Maternity Pay or my mortgage application?: Yes - this is the main practical downside. SMP is calculated on the lower post-sacrifice salary (the first six weeks at 90% of average weekly earnings can be materially lower), and most mortgage lenders use post-sacrifice gross as the affordability figure (some specialist lenders consider the pension contribution as discretionary income, but they are not the default). Net pay arrangement and relief at source do not have this side effect because gross salary is unchanged. If you are planning to take maternity leave or apply for a mortgage within 12 - 18 months, it is worth pausing or reducing salary sacrifice contributions.
Does the £260,000 adjusted income annual allowance taper apply to all three methods?: Yes - the £60,000 annual allowance and the taper that reduces it down to £10,000 once adjusted income exceeds £260,000 apply equally to salary sacrifice, net pay, and relief at source contributions. HMRC counts the total employer + employee gross contribution against the limit regardless of method. The taper is on adjusted income (broadly: taxable income plus employer pension contributions including salary-sacrificed amounts), so SS does not let you sidestep the taper - the sacrificed amount is added back when calculating adjusted income.
What happens to my contributions if I leave my employer mid-year?: Salary sacrifice and net pay contributions stop the day employment ends - they only exist while you are on payroll. Relief at source contributions through a personal pension or SIPP carry on regardless of employment status, and you can keep contributing from new earnings or savings. All three pots stay invested under your name and can be transferred to a new employer scheme or consolidated into a SIPP. The basic-rate top-up on RAS is available even if you have zero earnings in the year, up to £3,600 gross (£2,880 net) - the only relief route that works for non-earners.