Calculate what your charity donation is worth with Gift Aid: the 25% charity uplift, higher-rate relief for 40/45% taxpayers and the tax-cover check.
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Gross-ups your net donation at 100/80 (the charity reclaims 25p per £1 given), computes the extra 20% or 25% relief higher and additional-rate donors can claim on the gross donation, checks you have paid enough tax to cover the charity's reclaim, and shows the Personal Allowance taper bonus in the £100,000–£125,140 zone.
£4,000 net donation, £110,000 income: the charity receives £5,000 (+£1,000), you reclaim £1,000 higher-rate relief (net cost £3,000) and regain £2,500 of tapered Personal Allowance — worth another £1,000.
Enter the amount you actually give (net donation).
Enter your taxable income to compute higher-rate relief.
Enter the income tax/CGT you paid this year for the tax-cover check.
Read what the charity receives, your relief and your effective cost.
Last data update
July 5, 2026
Sources and references
GOV.UK — Gift Aid (gov.uk/donating-to-charity/gift-aid); tax relief on donations (gov.uk/tax-relief-donations); income over £100,000.
The data in this calculator is updated regularly to reflect the latest official rates. When in doubt, consult the official sources listed above.
25p extra per £1 donated: the charity reclaims basic-rate tax, turning a £100 net gift into £125 — at no additional cost to you.
The difference between their marginal rate and basic rate on the gross donation: 20% extra for 40% taxpayers, 25% for 45% taxpayers — claimed via Self Assessment or a tax-code adjustment.
Gift Aid requires you to have paid at least the reclaimed amount in income tax or CGT this year. If not, HMRC can ask you to make up the difference — do not tick the Gift Aid box.