Gift Aid Revenue Calculator
Estimate how much Gift Aid your charity could be missing. Enter your eligible donation income and declaration rate to see your gap in under 60 seconds.
This tool is for charities working out how much Gift Aid revenue they are missing. If you are an individual donor wanting to know what your own donation is worth, Gift Aid adds 25p automatically for every £1 you give, and GOV.UK's official guide covers higher-rate relief.
Gift Aid Calculator
Your numbers
This tool gives an estimate only, not tax or legal advice. Gift Aid eligibility depends on HMRC requirements and your organisation's records.
Your results
Gift Aid currently claimed per year
£0
Gift Aid at target rate per year
£0
Estimated additional Gift Aid over 3 years
£0
Estimated uplift per year if you hit your target
£0
Breakdown
| Metric | Value |
|---|---|
| Eligible donations per year | £0 |
| Donations covered at current rate | £0 |
| Donations covered at target rate | £0 |
| Gift Aid uplift rate | 25% |
Why charities under-claim Gift Aid
It is rarely eligibility. Most eligible donations simply never get a declaration attached to them.
The declaration is the bottleneck. A donor being eligible for Gift Aid and a donor actually ticking the box are two different things. The gap between them is your declaration rate, and it is almost always lower than charities assume until they check it.
Friction on the donation page kills declarations. An extra field, unclear wording, or a Gift Aid checkbox that looks optional rather than a genuine question, each one loses you donors who would have said yes if asked clearly.
Existing donors are the easiest fix. A regular giver who has never declared is not a lost cause, they are a five-minute email away. Before rebuilding anything, check whether your CRM or donation platform can identify donors with no Gift Aid declaration on file.
HMRC compliance still matters. A higher declaration rate is only worth claiming if your charity is recognised by HMRC and your records can support the claim. This tool gives you an estimate to work from, not a substitute for checking your HMRC status and record-keeping.
Questions charities ask about Gift Aid
There is no single benchmark that fits every charity, donor bases vary too much. What matters more than hitting a specific number is knowing your current rate and treating any meaningful gap between it and 100% as recoverable revenue worth investigating.
Yes. Your charity needs to be recognised for tax purposes by HMRC, separately from being registered with the Charity Commission, before you can claim. If you are not sure of your status, GOV.UK's Gift Aid guidance covers how to check and how to register.
Start with the donation page, since that is where most eligible declarations are won or lost. Make the Gift Aid question clear and visible rather than a small checkbox, explain in one sentence what it means for the donor, and check that it works cleanly on a phone. Then look at existing donors with no declaration on file, a short, plain-English email asking them to opt in often recovers more than any page redesign.
It varies too much by charity size, donor base, and existing process for a single figure to be meaningful, and we would rather you use the calculator above with your own numbers than repeat a general statistic that may not apply to you. What is consistent across the sector is that the gap between eligible donations and declared ones is rarely zero, and is usually worth checking.
Want help capturing more Gift Aid on your donation pages?
Your website's donation journey directly affects how many declarations you collect. We build WordPress websites for UK charities that are designed to make Gift Aid easy for donors to say yes to.