--- title: "Gift Aid Calculator — free UK donation tax relief tool" description: "Free UK Gift Aid calculator — see what your donation is worth to the charity and what you can reclaim at 40% or 45%" source: https://www.charitycompare.org.uk/gift-aid-calculator retrieved: 2026-08-18T01:24:27.194Z license: "Charity data © Crown copyright, Open Government Licence v3.0" --- Quick answer With Gift Aid a £100 donation is worth £125 to the charity (HMRC adds 25%). A higher-rate (40%) taxpayer can personally reclaim £25 back on that donation via Self Assessment — use the calculator below for your exact figures and tax band. Donation amount£ Reverse: enter what you can afford insteadYour tax bandBasic rate (20%)£12,571–£50,270Higher rate (40%)£50,271–£125,140Additional rate (45%)over £125,140 **I earn £100k–£125,140** — Gift Aid restores your Personal Allowance at up to 60% effective relief. [How the £100k trap works](https://www.charitycompare.org.uk/personal-allowance-gift-aid-calculator)Charity receives £125 £1 becomes £1.25 with Gift Aid You can reclaim £25 via Self Assessment (20% difference) Net cost to you £75 After 20% tax relief Estimates only, not tax advice — 2025/26 UK rates. The charity must hold a valid Gift Aid declaration from you and you must have paid enough tax to cover the reclaim. Figures: HMRC Gift Aid guidance. Calculator by [CharityCompare](https://www.charitycompare.org.uk/) — free to use and embed. ## Embed this calculator — free for charities Add this exact calculator to your website with one line. It is free, lightweight, and includes a credit link to CharityCompare — that’s how the tool stays free. Dofollow link, no sign-up. Iframe embed codeCopy code[Preview the embed →](https://www.charitycompare.org.uk/embed/gift-aid-calculator) Free to embed. Includes a dofollow credit link to charitycompare.org.uk — that is how the tool stays free. Embedding on a charity site never affects its Clarity Score. ## How Gift Aid works Gift Aid lets a charity reclaim the basic-rate tax you already paid on your donation from HMRC. Every £1 you give is treated as £1.25 gross, so the charity claims 25p on each £1. You must be a UK taxpayer and have paid at least as much tax as the charity will reclaim that year. ### Higher and additional rate relief If you pay tax at 40% or 45%, you can reclaim the difference between your rate and the basic rate on the grossed-up donation through Self Assessment or a P810. Donations can also be carried back to the previous tax year before you file. Estimates only — not tax advice. Check HMRC guidance or an accountant for your position.