How Pension Tax Relief Works
When you contribute to a pension, you get tax relief at your highest marginal rate. This means:
- Basic rate (20%) — Contribute £80, your pension gets £100 (provider claims £20 from HMRC)
- Higher rate (40%) — Contribute £100, claim back £20 via Self Assessment. Effective cost: £60 for £100 in pension
- Additional rate (45%) — Contribute £100, claim back £25. Effective cost: £55 for £100 in pension
💡 This makes pensions the single most tax-efficient way to save. No other investment gives you an immediate 25-67% return just from tax relief.
Annual Allowance
You can contribute up to £60,000 per year (or 100% of your earnings, whichever is lower) and receive tax relief. This includes both your contributions and your employer's.
Tapered Annual Allowance
If your "adjusted income" (total income + employer pension contributions) exceeds £260,000, your annual allowance is reduced by £1 for every £2 above this threshold, down to a minimum of £10,000.
Carry Forward
If you didn't use your full allowance in the previous 3 tax years, you can carry the unused amount forward. This means you could potentially contribute over £200,000 in a single year if you have enough unused allowance.
💡 Carry forward is incredibly powerful for higher earners. A bonus year? Max out your pension contributions using carried-forward allowance and save thousands in tax.
Salary Sacrifice vs Relief at Source
Relief at Source (Standard)
- You pay from your net (after-tax) pay
- Pension provider claims 20% basic rate automatically
- Higher/additional rate taxpayers claim the rest via Self Assessment
- You still pay full NI on your salary
Salary Sacrifice
- Your salary is REDUCED before tax and NI are calculated
- Employer pays the sacrificed amount into your pension
- You save Income Tax AND National Insurance (8%)
- Your employer saves NI too (13.8%) — many pass this saving to your pension
Example at £50,000 salary, £500/month sacrifice:
- Relief at Source: costs you £500/month, £400 after basic rate relief. Need to claim £100 more if higher rate.
- Salary Sacrifice: costs you ~£360/month (saves ~£140 in tax + NI). Your employer might add £69/month from their NI saving too.
💡 Always choose salary sacrifice if your employer offers it. The NI saving makes it significantly more efficient than relief at source.
The Lifetime Allowance (Abolished)
The Lifetime Allowance was abolished from April 2024. However, two new limits replaced it:
- Lump Sum Allowance (LSA): Maximum tax-free cash you can take is £268,275
- Lump Sum and Death Benefit Allowance (LSDBA): Overall limit of £1,073,100
Workplace vs Personal Pensions
Workplace Pension (Auto-Enrolment)
Since 2019, all employers must auto-enrol eligible workers. Minimum contributions: 5% employee + 3% employer = 8% total. Many employers offer more — always contribute enough to get the maximum employer match.
SIPP (Self-Invested Personal Pension)
A SIPP gives you control over your investments — choose your own funds, shares, ETFs. Same tax relief as workplace pensions. Useful if you're self-employed or want more investment choice.
The £100k Trap
If your income exceeds £100,000, your Personal Allowance starts to taper away at £1 for every £2. This creates an effective marginal tax rate of 60% on income between £100,000 and £125,140.
💡 Pension contributions reduce your "adjusted net income". If you earn £110,000 and contribute £10,000 to your pension, your adjusted income drops to £100,000 — restoring your full Personal Allowance and saving ~£6,000 in extra tax.
Taking Your Pension
From age 55 (rising to 57 from 2028), you can access your pension:
- 25% tax-free lump sum (up to £268,275)
- Remainder taxed as income when you draw it
- Options: annuity, drawdown, or lump sums