How does higher-rate pension tax relief work via Self Assessment in 2026?

Full answer

Pension tax relief allows contributions to reduce your taxable income at your marginal rate. The mechanism differs depending on how your pension adds the relief. **Relief at source (RAS) — personal pensions and SIPPs** You pay net of basic-rate tax. On a £8,000 personal contribution, the pension provider claims 20% from HMRC and adds it to your pot, giving a £10,000 gross contribution. This happens automatically. **Additional relief for higher and additional rate taxpayers** If you pay 40% or 45% income tax, you are entitled to relief at your full marginal rate: - **40% taxpayer**: entitled to 40% relief on gross contribution; already received 20% via RAS → claim additional 20% via Self Assessment - **45% taxpayer**: entitled to 45% → claim additional 25% via Self Assessment **Worked example (40% taxpayer)** You contribute £16,000 net (out of pocket) to a SIPP. The provider adds 20% basic-rate relief = £20,000 in your pension. Via Self Assessment you extend the basic-rate band by £20,000, saving 40% − 20% = 20% on £20,000 = £4,000 additional tax relief. Your effective cost of a £20,000 pension contribution is £12,000 (£16,000 paid in − £4,000 Self Assessment refund/reduction). **How to claim on Self Assessment** On the SA100 return, enter the gross pension contribution on page TR4 (Pension contributions). HMRC adjusts your tax calculation automatically, extending your basic rate band upward and reducing your Higher Rate Tax liability. **Net pay arrangement (workplace pensions)** If your workplace pension uses a net pay arrangement, contributions come off gross salary before tax is calculated — so you automatically receive full relief at your marginal rate without needing to claim via Self Assessment. **Annual Allowance** Pension contributions (employer + employee combined) are capped at the Annual Allowance of £60,000 for 2026/27, or 100% of UK earnings if lower.

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