How Does Gift Aid Work: Declarations, 25% Top-Up, and Higher Rate Relief

Gift Aid works like this: when you give £1 to a UK charity, HMRC lets the charity reclaim an extra 25p on top, because the money you donated had already been taxed at the basic rate before it reached you. So a £100 gift becomes £125 to the charity, at no additional cost to you. The scheme only works if you’ve paid enough UK Income Tax or Capital Gains Tax in the year to cover what all the charities you support will reclaim on your donations, and if you’ve given each charity a signed Gift Aid declaration.¹

Where the 25% Comes From

The basic rate of UK Income Tax is 20%. If you earn £125 and pay 20% tax on it, you’re left with £100. When you donate that £100 to a charity, Gift Aid effectively refunds the tax you paid on it, so the charity ends up with the full £125 you originally earned. That refund is worth 25p for every £1 you gave, which is where the familiar 25% figure comes from.

You qualify as a Gift Aid donor if you pay UK Income Tax or Capital Gains Tax. The condition to watch is the tax you’ve actually paid across the year. Add up everything all the charities and CASCs you support will reclaim on your gifts, and you need to have paid at least that much in tax. Donate £100 in total and the reclaim is £25, so you need to have paid at least £25 in tax that year to cover it.¹

If you sign a declaration but haven’t paid enough tax, HMRC can ask you to make up the shortfall.¹ This catches people out more often than you’d expect. Retirees whose income has dropped below the personal allowance, workers who’ve moved to part-time hours, and people whose taxable income has been replaced by tax-free savings income are all at risk. If your tax situation changes, tell the charity and cancel your declaration before further donations go through.

The Declaration You Need to Give

The Gift Aid declaration is your formal permission for a charity to reclaim tax on what you give it. Without one, the charity cannot claim, no matter how much tax you’ve paid. A valid declaration has to include your full name, your full home address with postcode, the name of the charity, a statement that you want Gift Aid to apply, and an explanation that you must have paid enough UK Income Tax or Capital Gains Tax to cover what will be reclaimed.² It also has to specify whether it covers a single donation or all past, present, and future gifts to that charity.

Charities can accept declarations in writing, electronically, or verbally. A verbal declaration has to be followed up by written confirmation from the charity, and you then have 30 days from the date of that confirmation to cancel. If you do cancel within that window, the cancellation is treated as if the declaration had never existed.³

For most regular donors, the practical answer is an ongoing declaration. Sign it once and every future donation to that charity is covered, with no further paperwork on your side. You can cancel at any time by telling the charity. The cancellation takes effect from the date they receive notice, or a later date if you specify one; donations before that point still count as Gift Aid donations.³ HMRC recommends keeping your own records of donations for at least 22 months from the end of the tax year they relate to.⁴

What Donations Qualify

Gift Aid applies to gifts of money from individuals: cash, cheques, bank transfers, and card payments. The charity has to be recognised by HMRC as a charity or a Community Amateur Sports Club (CASC); registration with the Charity Commission on its own isn’t enough.⁵

Several common payment types don’t qualify:

Donations from companies, which follow separate corporate tax rules.
Payroll Giving donations, which come from your gross pay before tax and already carry their relief.
Payments for goods or services, where you’re buying rather than giving.
Donations where the benefit you receive in return exceeds HMRC’s limits (see below).
Charity vouchers or charity card donations, such as those from the Charities Aid Foundation, where the tax relief was applied when the voucher was bought.
Gifts of shares, which qualify for a separate relief.

Sponsored challenges, church collections, charity membership fees, and money raised through auctions or events can sometimes qualify, but the specific conditions vary and the charity has to check each type.⁶

Higher and Additional Rate Taxpayers: Claim the Difference

The charity only ever reclaims at the basic rate of 20%. If you pay tax at 40% or 45%, the difference between the basic rate and your rate is yours to claim personally.⁷

The maths on a £100 gift looks like this. The charity grosses it up to £125 and reclaims £25 from HMRC. To have £125 net of tax at the 40% rate, you had to earn £208.33, on which you paid £83.33 in tax. Only £25 of that has been refunded to the charity. The remaining £33.33 is your personal relief to claim. At 45%, the personal share is larger still.

You claim it through your Self Assessment tax return, entering total Gift Aid donations in the charitable giving section. HMRC extends your basic-rate band by the grossed-up value of your donations, which reduces your tax bill.⁸ If you don’t file Self Assessment, contact HMRC directly and they’ll usually adjust your tax code so less tax is deducted from your pay going forward.¹

A surprising number of higher-rate taxpayers never claim this. If you’ve donated regularly over several years without doing so, check whether you can still recover some of it through amended returns.

If You Pay Scottish Income Tax

Scotland sets its own income tax rates, and in 2025–26 these differ from the rest of the UK. Scottish rates run from 19% at the starter band up to 48% at the top, with an intermediate rate of 21% and a higher rate of 42%.⁹

Gift Aid still works mechanically the same way: the charity reclaims at the UK basic rate of 20% wherever you live. But your personal relief follows Scottish rates. An intermediate-rate Scottish taxpayer at 21% gets a further 1% back. A Scottish higher-rate taxpayer at 42% gets 22% personal relief. At the 48% top rate, the personal share is 28%. Scottish taxpayers who don’t file Self Assessment should contact HMRC to make sure their tax code reflects the right relief.

When the Charity Gives You Something in Return

If the charity gives you something for your donation, whether that’s a mug, entry to a property, or a membership perk, the value of that benefit has to stay within HMRC’s limits or the whole donation stops qualifying for Gift Aid. The limits work on a tiered scale:¹⁰

On donations of £100 or less, the benefit cannot exceed 25% of the donation. A £40 gift allows a benefit worth up to £10.
On donations over £100, the maximum benefit is £25 plus 5% of the amount above £100. A £500 donation allows a benefit worth up to £45.
No benefit can ever exceed £2,500, regardless of donation size.

Cross the threshold and the whole donation becomes ineligible, not just the excess. If you’re paying for something that comes with a substantial perk, it’s worth checking how the charity has priced the benefit before assuming Gift Aid applies.

Carrying a Donation Back to the Previous Tax Year

Donations you make between 6 April and the filing deadline for the previous tax year’s return can be treated as if they were made in the earlier year. The tax relief then applies to that earlier year instead of the current one, which is useful if your income was higher then, or if you want to reduce a tax bill you’ve already calculated.⁸

Two conditions matter. You must make the election on your original tax return for the earlier year; HMRC will not accept a carry back claim added to an amended return. And you have to have paid enough tax in that earlier year to cover the charity’s reclaim on those donations. If your income moves around year to year, this flexibility is worth planning around.

1
GOV.UK. Tax Relief When You Donate to a Charity
2
GOV.UK. Gift Aid Declarations Claiming Tax Back on Donations
3
GOV.UK. Charities Detailed Guidance Notes – Chapter 3 Gift Aid
4
GOV.UK. Tax Relief When You Donate to a Charity – Keeping Records
5
GOV.UK. Claiming Gift Aid as a Charity or CASC
6
GOV.UK. Claiming Gift Aid as a Charity or CASC – What You Can Claim It On
7
GOV.UK. Income Tax Rates and Personal Allowances
8
GOV.UK. HS342 Charitable Giving 2024
9
GOV.UK. Income Tax in Scotland – Current Rates
10
GOV.UK. Simplification of Donor Benefits Rules for Gift Aid