UK Gift Aid donation breakdown.
Charity receives
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Basic rate top-up (HMRC to charity)
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Your SA refund
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Your breakdown
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The two halves of every Gift Aid donation
Gift Aid is one of the most generous reliefs HMRC offers, and it works in two distinct directions that people often conflate. When you tick the Gift Aid box, the charity reclaims the basic-rate tax you already paid on the money you donated, adding 25 pence to every pound. A £100 gift becomes £125 in the charity's hands. That part happens whatever your tax band, as long as you have paid enough Income Tax or Capital Gains Tax in the year to cover it. The second half only applies if you pay tax above the basic rate. You personally claim back the difference between your marginal rate and 20 percent, and that refund comes to you, not the charity. This calculator shows both halves at once.
Tracing a £100 gift from a higher-rate donor
Use the defaults: you give £100 net and pay tax at 40 percent. The mechanics turn on the grossed-up figure, because Gift Aid treats your £100 as if it were £125 of pre-tax income. The charity claims the £25 basic-rate top-up from HMRC. You then reclaim 20 percent of the gross £125, which is £25, through your Self Assessment return or by asking HMRC to adjust your tax code. Your true cost of putting £125 into the charity's account is only £75.
Additional-rate donors and the bigger reclaim
If you pay the 45 percent additional rate, the gap you reclaim widens to 25 percentage points of the gross gift. On a £1,000 net donation the charity still receives £1,250, but your refund rises to £313, so the same £1,250 of charitable giving costs you £688. Scottish taxpayers reclaim against their own bands: an intermediate-rate Scottish donor at 21 percent claims back just one percentage point, while a top-rate Scottish donor at 48 percent claims back a wider margin than an English additional-rate payer. The charity's 25 percent top-up is the same across the whole UK because it is fixed to the UK basic rate.
The mistake that triggers an HMRC bill
The single most important rule is the one most casual donors miss: you must have paid at least as much UK Income Tax or Capital Gains Tax in the year as the total the charities reclaim on your behalf. If you donate heavily but have a low tax bill, perhaps in a year you took a sabbatical or lived off savings, HMRC can ask you to repay the shortfall. A practical tip for higher earners: Gift Aid also extends your basic-rate band by the gross amount, which can pull income back out of the 60 percent effective trap between £100,000 and £125,140 where the personal allowance tapers away, and it can help keep adjusted net income under the £60,000 child benefit threshold. This tool focuses on the donation breakdown, so use it alongside an income tax calculator if you are giving to manage your marginal rate.
Can I claim the higher-rate relief without doing a tax return?
Yes. If you do not file Self Assessment you can tell HMRC about your Gift Aid donations and ask them to amend your PAYE tax code, or write in to claim a refund for a closed tax year. You can also carry a donation back to the previous tax year if you claim it before the filing deadline, which is useful if you were a higher-rate payer last year but not this year.
Does Gift Aid apply to charity shop donations or sponsorship?
Sponsorship money you give counts, provided no significant benefit comes back to you. Goods you drop at a charity shop can qualify too, but only once the shop sells them and you sign a retail Gift Aid agreement, because what is gifted is the sale proceeds rather than the items themselves.