Quick answer
Donor retention means keeping the supporters you have already recruited giving year after year. Mail is one of the strongest tools for it: JICMAIL's UK benchmarks put warm charity mail at an 11.5% response and £10.00 return per £1, against 0.7% and £0.20 for cold acquisition (2022–2025 averages). A good stewardship programme thanks donors quickly and personally, shows them what their gift did, asks again at amounts that match their giving history, and respects their contact preferences. Measure it by tracking how many of last year's donors give again this year.
Key takeaways
- Recruiting a donor by cold mail usually costs more than their first gift; JICMAIL's charity benchmark is a £161 cost per acquisition against a £27 average gift. Retention is how that investment pays back.
- UK giving is under pressure: CAF estimates the public gave £14bn in 2025, down from £15.4bn, and 2.8 million people cancelled a regular gift.
- A prompt, personal thank-you is the first step in retention. Mention the gift amount and what it will do, and invite a Gift Aid declaration if you do not have one.
- Use giving history to personalise warm appeals: ask strings, campaign history and length of support.
- The Code of Fundraising Practice requires you to justify how often you contact people and to make it easy to change preferences, so plan frequency deliberately.
Why donor retention matters
Most of a charity's income from individual donors comes from people who have given before. New donors are expensive to find, and the economics only work if a good share of them give again. JICMAIL's charity benchmarks show the gap between the two kinds of mail:
11.5%
Average response to warm charity mail sent to existing supporters
Source: JICMAIL Response Rate Tracker, 2022–2025 average
0.7%
Average response to cold charity mail sent to prospects
Source: JICMAIL Response Rate Tracker, 2022–2025 average
£161
Average cost per acquisition for cold charity mail, against a £27 average gift
Source: JICMAIL Response Rate Tracker, 2022–2025 average
2.8m
People in the UK who cancelled a regular gift to charity in 2025
Source: CAF UK Giving Report 2026, via Civil Society
The wider picture makes keeping donors harder and more important. The Charities Aid Foundation estimates that the UK public gave £14bn in 2025, down from £15.4bn in 2024, with the average monthly gift among donors falling from £72 to £65. The share of people who donated or sponsored held at 55%. With fewer pounds to go round, the donors who already know and trust you are your most valuable audience.
A stewardship journey by post
Stewardship is the sequence of contact between one gift and the next. Mail suits it because it is personal, it stays in the home and it can carry a reply form. A typical journey for a new donor looks like this:
- 1
Thank-you letter
Sent soon after the gift arrives. Personal, specific about the amount and what it will do, signed by a real person, with a Gift Aid declaration if you do not already hold one.
- 2
Welcome pack
For new donors or new regular givers: who you are, what their support makes possible and how to choose the contact they want.
- 3
Impact update
A report back on what happened, ideally linked to the appeal they responded to. No ask, or a soft one.
- 4
Newsletter or supporter magazine
Keeps the cause in view between appeals. A reply form gives supporters an easy way to give if they want to.
- 5
Warm appeal
A specific need, a clear ask at amounts matched to their giving history, and a reply form and envelope.
- 6
Regular giving or upgrade ask
For donors who have given more than once, an invitation to give monthly or to increase a regular gift.
- 7
Lapsed reactivation
For supporters who have stopped giving, a message that acknowledges their past support and gives a reason to return.
The thank-you is a production job too
Thank-you letters are small, frequent runs that need to go out while the gift is still fresh. Agree a regular cycle with your mailing house, such as a weekly or fortnightly run from a data file, so letters are not held back until there are enough to batch.
Personalising warm mail with giving history
Warm supporters have told you a lot through their giving. Using it makes each piece more relevant and stops the most generous donors being asked for less than they usually give.
| Data you hold | How to use it in print |
|---|---|
| Last gift amount | Set the ask string, for example £15, £25 or £50 for a donor whose last gift was £15 |
| Highest gift | Keep high-value donors' asks in line with what they have shown they can give |
| Campaign they joined through | Open with the cause or story that first moved them |
| Length of support | Thank long-standing supporters for the years, not just the last gift |
| Gift Aid status | Ask for a declaration only from donors who have not made one |
| Recency and frequency of giving | Choose the right message: thank, upgrade or reactivate |
| Contact preferences | Leave out anyone who has asked not to receive fundraising mail, and honour channel choices |
All of this is produced as variable data printing: your database drives the text, amounts and versions on each letter and form. Before the data reaches print, data cleansing removes duplicates and gone-aways, so you do not thank the same supporter twice or keep writing to an old address.
Warm donor mailings, personalised from your data
Thank-you letters, impact updates and warm appeals with ask-string personalisation, printed, enclosed and posted from our Keighley site.
Explore the serviceFrequency, preferences and opting out
Retention is not the same as mailing more often. The Fundraising Regulator's Code of Fundraising Practice requires charities to be able to justify how often they contact people about fundraising (standard 8.4.4), to remind people of their contact preferences and offer an easy way to change them (standard 8.4.2), and to give a simple way to opt out (standard 8.4.3).
- Offer choices, not just an exit. Let supporters choose fewer appeals, only newsletters or only certain causes. Some will reduce contact rather than leave altogether.
- Act on the Fundraising Preference Service. When a supporter uses the FPS to stop contact from your charity, the request must be actioned within the deadline in the FPS terms. Our charity appeal pack checklist gives the timings.
- Stop mailing people who have died. The Code requires it (standard 8.4.1), and a letter to a bereaved household damages trust in the cause.
- Respect objections. Under UK GDPR, the right to object to direct marketing is absolute. See our GDPR and direct mail guide.
Measuring retention
You cannot improve retention without measuring it consistently. These are the measures most charities track for their supporter mail:
| Measure | How to calculate it | What it tells you |
|---|---|---|
| Retention rate | Donors who gave last year and again this year, divided by all donors who gave last year | Whether supporters are staying |
| First-year retention | The same calculation for donors recruited in a given year | Whether new donors give a second time; usually the weakest link |
| Response rate by mailing | Gifts received with the mailing's source code, divided by packs mailed | Which appeals and segments respond |
| Average gift | Income from a mailing divided by the number of gifts | Whether ask strings are pitched right |
| Return on investment | Income from a mailing divided by its total cost | Whether each segment pays its way |
Print a source or version code on every reply form so each gift can be traced to the mailing and segment that produced it. Compare your results with JICMAIL's charity benchmarks in our response rates guide, and see how recruitment and retention fit together in our charity direct mail fundraising guide.
Sources
- JICMAIL – Response Rate Tracker, full year 2025 update (charity sector benchmarks)
- Charities Aid Foundation – UK Giving Report 2026
- Civil Society – Charitable giving from Brits fell by 10% to £14bn last year, CAF estimates (16 March 2026)
- Fundraising Regulator – Code of Fundraising Practice, Fundraising communications and advertising (section 8)
- Fundraising Regulator – Fundraising Preference Service: guidance for charities
