Recover Your Personal Allowance with Pension Contributions Over GBP 100,000 (2026/27)

Why GBP 100,000 is the most punishing line in the UK tax system

For 2026/27 the Personal Allowance is GBP 12,570. Once your adjusted net income passes GBP 100,000, that allowance is reduced by GBP 1 for every GBP 2 of income above the threshold. By GBP 125,140 it has vanished entirely.

The effect is that income in the GBP 100,000 to GBP 125,140 band is taxed at 40% directly, plus you lose allowance that would otherwise be tax-free. The combined cost is an effective marginal rate of 60%. With 2% employee National Insurance on this band, the real bite is closer to 62%.

This is the single highest-leverage zone for legal tax planning in the UK, because reducing your income here is rewarded far more generously than at any other level.

How a pension contribution restores the allowance

The taper is measured against adjusted net income. A gross personal pension contribution reduces that figure pound for pound. Pull your adjusted net income back down to GBP 100,000 and the full GBP 12,570 allowance returns.

Worked example

Priya has a taxable income of GBP 112,570 in 2026/27. She is GBP 12,570 over the threshold, so her Personal Allowance is reduced by GBP 6,285 (half of the excess).

She makes a gross pension contribution of GBP 12,570. Her adjusted net income falls to exactly GBP 100,000:

• The full GBP 12,570 Personal Allowance is restored.
• The GBP 12,570 that would have been taxed at 40% is now in her pension instead.
• Combined income tax and allowance saving on that band: roughly 60%, or about GBP 7,540.
• The net cost to Priya, after relief, is far less than GBP 12,570 because the contribution itself attracts tax relief.

In effect, a large slice of money that HMRC would have taken is redirected into Priya's own retirement pot.

Relief at source versus salary sacrifice

There are two common routes, and they are taxed differently:

• Relief at source: you pay from net salary, the provider adds 20% basic-rate relief, and you reclaim higher-rate relief through Self Assessment or a tax code change. This lowers adjusted net income.
• Salary sacrifice: you agree to a lower gross salary in exchange for an employer pension contribution. This lowers adjusted net income and also saves 8% employee NI in this band, and often employer NI is added back into the pot.

Salary sacrifice is usually the more efficient option where an employer offers it, because of the extra NI saving.

Points to check before you act

• The pension annual allowance is GBP 60,000 in 2026/27, potentially tapered for the highest earners.
• Carry-forward of unused allowance from the prior three tax years may let you contribute more.
• Gift Aid donations also reduce adjusted net income and can be combined with pension contributions.
• This is general information, not financial advice. Your own figures, scheme rules and other income sources matter.

If you are anywhere near the GBP 100,000 line, model the numbers before payday rather than after. Try the take-home pay and pension calculators on CalcHub to see the effect on your net position, and confirm the current rules and annual allowance tapering on gov.uk.