Pension Tax Relief
Comparator UK 2026

Three UK pension contribution mechanisms: (1) Relief at Source (RAS) — you contribute net of basic-rate tax (20% added by HMRC automatically). Higher-rate (40%) and additional-rate (45%) taxpayers must claim the extra relief via Self Assessment (HMRC sends it to you, NOT the pension). Common in personal pensions, SIPPs, NEST, group personal pensions. (2) Net Pay — contributions deducted from gross salary BEFORE tax. Automatic full marginal-rate relief without filing. Common in workplace DC schemes. (3) Salary Sacrifice — you give up part of your salary in exchange for the employer making a pension contribution. Saves income tax PLUS employee NIC (8% / 2%) PLUS employer NIC (13.8%, often partially shared). Most tax-efficient for employees with pre-tax contribution capacity.

On a £1,000 contribution, salary sacrifice saves the EMPLOYEE: 20% income tax + 8% Class 1 NIC = 28% net cost. Net Pay saves: 20% income tax = 20% net cost (no NIC saving). Salary sacrifice saves the EMPLOYER: 13.8% NIC, which they can choose to keep or pass back to you (typical: 50/50 split, increasing the employee's take or boosting the pension contribution). So a £1,000 sal-sac contribution can effectively cost you £720 in basic rate vs £800 with Net Pay — and that's BEFORE the employer NIC saving they may share. For higher-rate taxpayers: 40% income tax + 2% NIC = 42% saving with sal-sac vs 40% with Net Pay (the NIC marginal drops from 8% to 2% above the UEL, so the gap narrows).

Income between £100,000 and £125,140 gets effective ~60% pension tax relief. Reason: above £100k, the £12,570 Personal Allowance reduces by £1 for every £2 of income (s.35 ITA 2007), fully tapered out at £125,140. A £100 pension contribution that brings income from £105,000 to £104,900 restores £50 of PA (50% reduction × £100), saving £20 of tax (40% × £50). Combined with the £40 normal higher-rate relief, total effective relief = £60 on a £100 contribution = 60%. This is the most tax-efficient pension contribution band in the UK system. Salary sacrifice in this band saves an additional 2% NIC, pushing effective relief to 62%.

Salary sacrifice reduces your gross salary contractually. Lower gross = lower income tax + lower employee NIC. The pension contribution comes from the difference. Example: £60,000 gross, salary sacrifice £5,000/year. New gross £55,000. Income tax saved: £2,000 (40% × £5,000). Employee NIC saved: £400 (8% × £5,000). Take-home pay reduced by £2,600, but pension grows by £5,000 — i.e., £1,000 more in pension than the take-home reduction. If employer shares 50% of their 13.8% NIC saving: extra £345 added to pension. If employer keeps 100%: just the £5,000. Always confirm with HR what the employer NIC handling is.

Yes — lenders typically use your post-sacrifice salary as the income figure for affordability checks. Sacrificing £5,000/year reduces declared gross by £5,000, potentially reducing your borrowing capacity by £20,000-£30,000 (4-6× income multiple). Three approaches: (1) Pause sacrifice 3-6 months before mortgage application to maximise declared income. (2) Provide gross salary documentation showing pre-sacrifice income (some lenders accept). (3) Use a 'matched contribution' ceiling rather than max sacrifice. Discuss with your mortgage broker before applying — this trade-off is easily missed and can cost meaningful borrowing power.

SMP is calculated on the AVERAGE WEEKLY EARNINGS during the 8-week 'relevant period' before the qualifying week (15 weeks before due date). If you've been sacrificing during this period, SMP is calculated on your post-sacrifice salary, reducing maternity pay. For higher earners, SMP is already capped (90% of average earnings for first 6 weeks, then £184.03/week or 90% of average earnings whichever is lower for 33 weeks — the £184.03 cap usually bites). For lower earners, the impact can be material. Common technique: pause salary sacrifice in the 8-week relevant period to maximise SMP. Same principle applies to SSP (Statutory Sick Pay) and SPP (Statutory Paternity Pay).

Net Pay does NOT give relief to non-taxpayers. If your earnings are below the £12,570 Personal Allowance, you pay no income tax, so a Net Pay scheme cannot deduct tax you didn't pay. RAS schemes DO give 20% basic-rate top-up regardless of whether you actually paid tax — this 'low earners' advantage of RAS over Net Pay was estimated to affect 1.2 million workers per HMRC analysis. The April 2024 'Top-up' system (launched in 2024-25) refunds non-taxpayers in Net Pay schemes the equivalent 20% directly via HMRC after the tax year ends. As of 2025-26, this should mean parity between RAS and Net Pay for low earners — in theory.

HMRC has no specific cap on salary sacrifice, but two practical limits apply: (1) National Minimum Wage (NMW) — sacrifice cannot reduce gross pay below NMW (£11.44/hour as of April 2024). For full-time minimum-wage workers, this leaves zero sacrifice headroom. (2) Annual Allowance — pension contributions (employee + employer + sacrifice) above £60,000/year (or tapered floor of £10k for high earners) trigger the AA charge at marginal rate. Use Richify's Pension AA Calculator at /uk/tools/pension-annual-allowance-calculator to check your AA. (3) Salary sacrifice agreements typically lock you in for at least 12 months (some employers allow life-event variations). Many employers also apply a maximum sacrifice % (commonly 30-50% of gross) to leave headroom for other deductions.

Auto-Enrolment minimum: 8% of qualifying earnings (£6,240-£50,270 band for 2025-26) — 5% from employee + 3% from employer. Employers can use ANY of the three relief mechanisms to comply. Most large employers run Auto-Enrolment via Net Pay (no admin friction) or Salary Sacrifice (NIC saving). NEST — the government-backed default scheme — runs RAS. Workers can opt out within 30 days (full refund) or any time afterwards (no refund). Increased employer-only contributions above the 3% minimum are common in larger firms (5-10% typical). Salary sacrifice variants of Auto-Enrolment ('SMART pension') have been adopted by many FTSE-listed employers post-2018.

Scottish income tax has different bands (19% starter, 20% basic, 21% intermediate, 42% higher, 45% advanced, 48% top — FY 2024-25 indicative) but the same NI rates. RAS schemes only top up at 20% basic UK rate — Scottish higher-rate (42%) and advanced-rate (45%) Scottish taxpayers must claim the additional relief via Self Assessment. Some pension providers don't auto-handle this for Scottish residents, leaving the relief unclaimed unless you file SA. Salary Sacrifice and Net Pay provide automatic full Scottish marginal-rate relief without SA filing. Welsh taxpayers use UK rates so no special handling needed (Welsh rates have aligned with rUK since introduction).