You’re about to donate £100 to charity. You choose the appeal, enter your details, and reach the payment page. Just before you finish, there is a box that asks whether the charity can claim Gift Aid, and it’s easy to tick (or skip) without thinking. After all, most of us have seen the question so many times that it feels like accepting a website’s terms and conditions.
But what does that Gift Aid box do? It can add 25% to your donation (so a £100 donation can become £125!), but ticking it means you’re making a declaration about the tax you’ve paid. This blog explains where the extra money comes from and what UK donors agree to when they add Gift Aid. It also covers payments that don’t qualify and what As-Salaam does with the amount claimed.
What is Gift Aid and where does the extra 25% come from?
Gift Aid is a form of UK tax relief, and it allows an eligible charity to claim 25p from HM Revenue and Customs (HMRC) for every £1 you donate as an individual. You still give £100, but the charity receives £125 after making its claim. The figures can look wrong at first because the basic rate of Income Tax is 20%, yet the charity receives an extra 25%.
The reason is that your £100 is treated as the amount left after 20% tax was taken from £125, so the charity claims the remaining £25 and nothing extra is charged to your card or bank account when you make the donation. If you are looking for more info, the government’s Gift Aid guidance for donors confirms how this works. It also makes clear that Gift Aid isn’t automatic because the charity needs your permission and you need to have paid enough tax.
What you agree to when you tick the box
By making a Gift Aid declaration, you’re confirming that you’ve paid enough UK Income Tax or Capital Gains Tax to cover the Gift Aid claimed on all your donations during that tax year. So let’s say you donate £400 across four charities. Together, the charities can claim £100, which means you must have paid at least £100 in Income Tax or Capital Gains Tax during the same tax year (the UK tax year runs from 6 April to 5 April the next year).
HMRC may ask you to pay the difference if charities claim more than your tax covers. This can happen after retirement, a reduction in working hours or another change in income, so you should contact every charity holding a declaration for you if your circumstances change.
You don’t need to fill in a new form each time you donate because a declaration can cover donations made now, in the future and during the previous four years as long as you’ve paid enough tax in each relevant year. Generally, you need to give a declaration to each charity you support. In some events, such as a joint fundraising event, one declaration may cover multiple charities if they are all clearly identified.
HMRC’s guidance on Gift Aid declarations explains the details a charity must collect, which usually include your full name and home address. You won’t need to send the charity a payslip or tax return, but you are responsible for checking the tax amount while the charity keeps the declaration as part of its HMRC records. You should also tell the charity if your name or address changes so that its records remain accurate, although the change does not automatically invalidate your declaration.
A payment to charity isn’t always a donation
Buying something from a charity is different from giving money without receiving anything in return. Ordinary Gift Aid generally applies to voluntary gifts of money made by individuals, so it doesn’t work in the same way for donations from limited companies, Payroll Giving, or payments for goods and services.
This matters at fundraising dinners, auctions and sponsored challenges. Ticket prices, compulsory entry fees and participant registration fees generally don’t qualify, although voluntary sponsorship donations may qualify when HMRC’s conditions are met. HMRC publishes detailed guidance on eligible payments and donor benefits, so if you’re unsure about a payment, ask the charity.
Higher-rate taxpayers can claim relief too
The charity always claims at the basic rate, but donors who pay higher or additional-rate Income Tax may be able to claim further relief for themselves. GOV.UK uses the example of a £100 donation whose value rises to £125 after Gift Aid. A donor paying 40% tax can claim £25, normally through Self Assessment or by asking HMRC to amend their tax code, while the charity still receives its full £125.
What Gift Aid means at As-Salaam
Every charity has running costs even when nobody takes a salary. Websites have to be maintained, accounts must be prepared, and fundraising costs still have to be paid. We at As-Salaam Humanitarian Foundation keep money for charitable projects in charity-only bank accounts. Our donation policy explains that Gift Aid and donations given specifically for administration go into a separate administration account. Also, none of our trustees or volunteers receive a wage or salary.
With this structure, the original donation goes to the charitable work chosen by the donor, while the extra 25% from Gift Aid primarily helps fund the work behind our projects, and any unused Gift Aid may be transferred to our charity-only accounts. That is how we at As-Salaam maintain our 100% donation policy.
TLDR:
Gift Aid is one of the simplest ways to make a UK charity donation go further because the government adds 25% on top of whatever you give and it costs you nothing extra. The conditions are straightforward: the money has to be your own, the donation has to qualify, and you need to have paid enough tax to cover what every charity claims.
For As Salaam, that extra 25% is what keeps the organisation running without touching the donations themselves, so the work you chose to support receives every pound you gave. If you’re eligible, ticking the box takes a second and adds a quarter to your contribution, and if you’re not sure, a quick check with HMRC or the charity can save a correction later.
