The Thank-You Letter Most Nonprofits Get Wrong
A gift arrives on a Tuesday. The database catches it, the acknowledgment run goes out Friday, and the following week a donor opens an envelope that reads about like this: "Dear Friend, thank you for your generous gift of $100 in support of our mission. No goods or services were provided in exchange for this contribution. Your support helps us continue our important work in the community." At the bottom sits a signature that was scanned in two executive directors ago.
Nothing in that letter is wrong. It is accurate, it went out reasonably fast, and it will hold up if the donor is ever audited. It is also a piece of mail a donor is almost certain to open, which makes it one of the few guaranteed moments of attention a development office gets all year. And most of us fill it with flat, borrowed sentences.
I wrote letters like that for years. I was raising money in ministry and running the acknowledgment process myself, and the letter was what I did after the real work was finished, in whatever minutes were left on a Friday. What I have learned since is that the acknowledgment does a much larger job than closing out a gift. It is the opening line of the next one.
A Receipt and a Thank-You Are Two Different Documents
For any single contribution of $250 or more, a donor needs a written acknowledgment from the organization in order to claim the deduction, and the IRS is specific about what it has to contain: the name of the organization, the amount of any cash contribution, a description (but not the value) of any non-cash contribution, a statement about whether the organization provided goods or services in return, and a good-faith estimate of their value if it did. Those are the required elements. Nothing on the list asks you to say anything to the person who gave.
Most acknowledgment letters are that compliance document with two sentences of warmth attached to the front. Once the tax language sits in the body, it sets the temperature for everything around it, and what the donor reads is a form with feelings added. Move the receipt to the bottom of the page, below a rule, in smaller type, where an accountant will find it and a donor will skip it. Then write the space above it to a person.
That distinction carries more weight than it sounds like it should, because communication is where most donors are quietly lost. Adrian Sargeant's research on donor defection, summarized by Bloomerang founder Jay Love, asked lapsed donors why they stopped giving. Alongside the reasons no letter can fix — money got tight, another cause felt more urgent — sit five that an office decides for itself: 18% cited poor service or communication, 13% were never thanked for donating, 9% had no memory of supporting, 8% had no information on how the money was used, and 5% thought the organization did not need them. Respondents could name more than one reason, so the figures overlap rather than summing to a total. They still point one direction.
The sector-level numbers point the same way. The Fundraising Effectiveness Project, a joint effort of the AFP Foundation for Philanthropy and GivingTuesday, reported that in 2025 dollars grew while the number of donors fell 3.6%, and that retention of brand-new donors stayed essentially flat. First gifts keep arriving and second gifts keep not arriving, and the acknowledgment sits directly between the two.
What Actually Belongs in the Letter
None of what follows needs a designer, a new template, or a budget line. Five things carry most of the weight, and a one-person shop can do all five.
Speed. Aim for 48 hours and live with 72. A thank-you that lands while the donor still remembers writing the check reads as a response. The same letter three weeks later reads as processing. If your gifts are batched into a monthly acknowledgment run, that is the change I would make before touching a word of the copy.
More "you" than "we." Read your current letter and count the pronouns. Most acknowledgments run heavily toward "we" and "our" — our mission, our programs, our important work — which quietly makes the organization the subject of a letter about the donor. Flipping that ratio usually means rewriting three sentences.
The real number, and what it did. "Your generous support" is the phrase we reach for when we have not looked up the gift. "Your $100" is a sentence that could only have been written to one person. Then say what that amount made possible in concrete terms — a week of tutoring for one student, two nights of shelter, the fuel for a Saturday delivery route. Round numbers are fine. Vagueness is what costs you.
Past tense. "You will help us serve families this year" asks the donor to trust a forecast. "You served eleven families last month" reports a result they already produced. Gratitude written in the past tense is a small version of an impact report, and it does part of the job that a real impact report will finish later in the year.
Nothing that looks like another ask. A reply envelope tucked into a thank-you tells the donor the gratitude was packaging. So does a paragraph about the year-end campaign, or a line about how much more is still needed. Let the letter do one job, and the next appeal letter will land better for having been given some room.
Then sign it by hand, in ink, and add a line in the margin if you can — five words about that donor, their neighborhood, the event they attended. A handwritten postscript takes fifteen seconds and is often the part of the page a donor keeps.
An acknowledgment process is the kind of work worth setting up once and running on rails — a standard, a template you actually like, and a rhythm that survives a busy December.
Want to develop your fundraising skills? Take a look at my Claude Skills page.
Explore the Skills
The Call Worth Adding to the Letter
There is a well-known piece of research on donor gratitude that has nothing to do with writing. In an experiment described in Penelope Burk's Donor-Centered Fundraising, board members phoned donors within 48 hours of a gift for no reason other than to say thank you. Those donors gave 39% more the next time they were solicited than donors who received no call. The book dates to the early 2000s, so I would treat it as the finding of one experiment rather than a current benchmark. The direction of it matches what I have seen when organizations try it.
What makes the call work is that it breaks the pattern. Every other time the phone rings from a nonprofit, there is a request attached. A call with no ask is a small, memorable surprise, and ten calls take about an hour.
Board members are the right callers, and it is an easier assignment than the one they usually dread, since nobody has to persuade anyone of anything. Give them five names, the gift amount, one sentence about what the gift funds, and permission to leave a voicemail. In my experience it is also a good on-ramp to board members participating in fundraising at all, because it starts them in the part of the work that feels good.
Ask Your Donors Which Envelope They Want
We tend to assume the printed letter is the gold standard. Donors are less committed to that idea than we are. In Nonprofit Tech for Good's survey of 641 people who had given online in the previous year, 57% said they prefer to be thanked by email, with print letters at 18%, postcards at 10%, text messages at 6%, social media messages at 5%, and phone calls at 4%. The same survey found that while 57% believe nonprofits communicate the impact of their gifts effectively, 38% do not.
Read together, those two numbers point at content rather than production. Donors want to hear what happened to the money, in whatever envelope is easiest. That makes the automatic email confirmation your donation page sends a real piece of donor communication. For most online givers it is the thank-you, arriving in seconds, and it deserves the same attention as anything you print.
Where it makes sense, vary the format by group rather than by gift size alone. New donors need the fastest, warmest version, since that is where first-time donors disappear. Monthly donors do not need twelve letters a year, and thanking a recurring donor the same way every month teaches them to stop opening the envelope. Major donors get the call. That is about as much segmentation as this piece requires.
And if you would rather not guess, ask. Ten phone calls will tell you which channel your donors want and what they wish they heard more of. What your donors would tell you if you asked is usually simpler and cheaper than what we build for them.
The donors who feel genuinely known by an organization are often the same people thinking about what they want their giving to accomplish after they are gone, and that conversation opens more easily once the relationship is real.
Interested in learning more about how a whole life insurance policy could benefit your nonprofit? Connect with a team member at Sage & Main.
Connect with Sage & Main
Where to Start This Week
If your acknowledgment letter has not been touched in a while, here is what I would do first.
1. Read your current letter out loud. All the way through, standing up. You will hear the problem in about twenty seconds, and it will usually be the tax paragraph sitting in the middle of a sentence meant for a human being.
2. Move the receipt to the bottom. Below a line, in smaller type. Then rewrite the top half with the gift amount in it and one specific thing that amount does.
3. Set a 48-hour standard and write down who owns it. Write it down as a standard rather than a goal, with a name attached and a backup for the weeks that person is out. A piece of the process with nobody's name on it does not survive a busy October.
4. Hand five names to a board member. Gift amount, one sentence about what it funds, no ask. Ask them to report back at the next meeting. In my experience that does more for how a board thinks about fundraising than a training session.
An acknowledgment letter is a small piece of writing most of us inherited rather than chose, and an afternoon of work on it changes what every donor experiences for years. It also sits at the front of everything else you send, which is why it belongs on the same page as the rest of your donor communications plan rather than buried in database settings. Get the first 48 hours right, keep that promise through the first 90 days, and you will spend less time winning back donors who were never unhappy with you.
C.J. Bergmen is a pastor, licensed counselor, and fundraising strategist who helps organizations and generous individuals approach giving with honesty and long-term vision.