Gift Aid calculator

This calculator shows what a donation is worth to your charity once Gift Aid is added — 25p for every £1 given by an eligible UK taxpayer — and what a higher-rate donor can personally reclaim. Enter a donation amount to see the figures, with the rules and rates shown.

How to use it

  1. Enter the donation amount.
  2. Optionally, select the donor’s tax rate to see any higher-rate relief they can reclaim.
  3. Read the total to your charity and, where relevant, the donor’s personal reclaim.

The method and its sources

  • Gift Aid to the charity: donation × 25%. (The charity reclaims the 20% basic-rate tax treated as paid; £1 net = £1.25 gross, so the reclaim is 25p per £1.)
  • Gross donation: donation × 1.25.
  • Higher-rate relief to the donor: 40% taxpayer reclaims 20% of the gross donation; 45% taxpayer reclaims 25% of the gross donation.
  • Eligibility: the donor must be a UK taxpayer who has paid at least as much Income Tax and/or Capital Gains Tax as all charities will reclaim on their gifts that year, and has made a valid Gift Aid declaration.
  • GASDS: small donations of £30 or less; up to £8,000 a year (a £2,000 top-up); capped at 10× your Gift Aid claim.

Sources: HMRC / gov.uk Gift Aid guidance and the Gift Aid Small Donations Scheme rules. Basic rate 20%; Gift Aid top-up 25%. Verified 10 July 2026.

How to read your result

This is guidance, not advice. The figures assume the donor is eligible and has made a valid declaration — without one, you cannot claim. Higher-rate relief goes to the donor, not the charity. Keep your declarations and records for the period HMRC requires, and check the current rules and rates on gov.uk if in doubt.

CharityIQ helps keep declarations and records in order so eligible Gift Aid is not left unclaimed — with a person checking each claim.