A letter of support is the part of an application you cannot write yourself, which is exactly why funders ask for it.
When a foundation asks for letters from partners, it is testing something a proposal cannot test on its own: whether anyone outside your organization believes the program is real. A letter from a school district, a clinic, a city department or another nonprofit says that you have a relationship, that the work has been discussed with someone who will be affected by it, and that the partnership is more than a sentence in a narrative.
Why they carry weight
Reviewers read a lot of proposals that describe collaboration in the abstract. A letter is evidence. It has a name, a title and an organization on it, and it can be checked.
They also do something quieter. A good letter states what the partner will do, which turns a claim into a commitment. That is the difference between "we will partner with the school district" and "the district will provide two classrooms and refer 60 students."
Who to ask
Ask the people who are actually involved in the work, in this order of preference:
- Delivery partners. The organization or agency that will help run the program, refer participants, or host it.
- Institutional anchors. A school, a clinic, a library or a local government office, if they have a role rather than a general interest in you.
- Beneficiaries or their representatives, where appropriate and where they can speak to the need and to the program.
- Peers and coalition partners who can speak to your track record.
Do not ask someone who has no connection to the program. A letter from a state senator who has never heard of your work reads as padding, and reviewers recognise it immediately.
Ask people who have said yes to something specific. "Would you write a letter supporting our application" is a weak ask. "Would you confirm in writing that the clinic will refer patients to this program" is a strong one, and it is much easier for them to answer.
Make it easy for them
Most late letters are late because the person asked did not know what to write. Remove that problem by sending three things:
- The deadline, with the date you need it, which should be at least a week before the funder's.
- A short description of the program, and the partner's specific role in it.
- A suggested structure, so they can write it in ten minutes.
Offering a draft is normal and not dishonest, as long as they are free to change it and it says what they actually mean. What is not acceptable is writing it yourself and asking for a signature.
What a useful letter contains
Four or five short paragraphs is plenty.
- Who they are, and their relationship to the work.
- The need, as they see it from where they sit. This is often the most valuable paragraph in the whole application, because it is an outside voice describing the same problem you described.
- What they will contribute, specifically. Referrals, staff time, space, data, expertise.
- Why they believe your organization can do it, with something concrete behind the belief.
- A commitment, with a name, title, organization, signature and date.
A letter with no specific commitment is a nice note. A letter that names what the partner will do is part of the case for funding.
Manage the timeline
Ask early. Two to three weeks before you need the letter is not excessive for anyone who has to route it through a communications office or a board.
Keep a simple list of who was asked, when, and what they promised. Chase politely a week before your internal deadline, not the day before the funder's. And have a fallback: if a letter does not arrive, say so in the application rather than submitting an empty page where a document should be.
Where this sits in your application
Letters of support are external, so no drafting tool can produce them for you. What GrantSlate can do is the part around them: it drafts the narrative that explains the partnership, and its instructions stop it from inventing a partner, a commitment or a letter that does not exist.
The letters themselves are the relationship work, and they are worth doing properly. A funder who sees one specific, committed letter learns more about you than from three pages of narrative.