What Is a Letter of Inquiry (LOI)? Structure, Length, Template, and Examples

A letter of inquiry, or LOI, is a one-to-two-page document a nonprofit, researcher, or community organization sends a funder to introduce a project and ask for permission to submit a full proposal. It is a screening gate. Roughly half of foundations use some form of inquiry step before they invite a full application, because reading a two-page letter is far faster than reading a thirty-page package, and most ideas can be screened out or in on that first read. Get the LOI right and you are invited to apply. Get it wrong and you never hear back. This guide covers what an LOI is and why funders use it, how it differs from a full proposal, a cover letter, and a concept paper, the standard components, ideal length and format, how to address a program officer, a reusable template, a full worked example, how to tailor it to each funder, and the specific mistakes that separate an invitation from silence.

What a letter of inquiry is and why funders use it

An LOI is a brief, persuasive snapshot of a fundable project. It is sometimes called a letter of interest, a letter of intent, or a concept paper depending on the funder, and the boundaries between those terms are genuinely blurry. What stays constant is the function: it lets a funder decide, quickly and cheaply, whether your idea is worth a deeper conversation.

The reason this step exists is workload on the funder's side. A program with a small staff may receive several hundred requests a year and fund only a few dozen. Inviting full proposals from everyone would bury reviewers in material that is, in most cases, a poor fit. The LOI is a filter. From the funder's viewpoint it is faster to make the first cut with a two-page letter than with a full proposal package, and for many smaller foundations the LOI alone is enough to make a yes-or-no decision.

That changes how you should treat it. An LOI is not a formality or a placeholder. It is your first and sometimes only chance to make the case, written for a reader who is skimming, comparing you against many others, and looking for a reason to say no. Every sentence has to earn its place.

It helps to picture what the reviewer is actually doing with your letter. A program officer with a stack of inquiries is not reading for pleasure; they are sorting. On a first pass they check eligibility, geography, and program fit, and anything outside the lines goes straight to the no pile regardless of how good the idea is. On a second pass, for the letters that survive, they look for evidence that the problem is real, the organization can deliver, and the budget is plausible. Only the letters that clear both passes get discussed with colleagues or invited to apply. Knowing this, you can write defensively: make eligibility and fit obvious in the first paragraph so you never lose on a technicality, then spend the rest of the letter giving the second-pass reader concrete reasons to advance you.

LOI vs full proposal vs cover letter vs concept paper

These four documents are easy to confuse, and using the wrong one wastes the reader's goodwill. The distinctions matter because each answers a different question for the funder.

• Letter of inquiry. A one-to-two-page mini-proposal whose job is to win an invitation to apply. It is persuasive and is scored on fit and merit. This is the document this guide is about.
• Full proposal. The complete application, often ten to thirty pages or a structured online form, submitted only after the LOI is accepted or when a funder takes full proposals directly. It contains the detail an LOI deliberately leaves out: a full statement of need, a logic model, a detailed budget, an evaluation plan, and supporting documents.
• Cover letter. A short transmittal note, usually a few paragraphs, that accompanies a full proposal or report. Its job is to introduce the enclosed package and route it to the right person, not to make the substantive case. An LOI does the persuading; a cover letter does the escorting.
• Concept paper. A close cousin of the LOI, typically two to four pages, more common in research and government contexts. It describes the idea and approach in slightly more depth but, like the LOI, exists to test fit before anyone invests in a full submission. In practice many funders treat concept paper and LOI as the same thing.

One more pair of terms to untangle: letter of inquiry versus letter of intent. They are often used interchangeably, but a letter of intent can also be a purely administrative notice, sometimes a single paragraph, that simply tells the funder you intend to apply so they can plan their review load. A letter of inquiry is always persuasive. When a funder uses the phrase, read the guidelines to see whether they want a heads-up or a pitch.

The standard components of a letter of inquiry

A strong LOI moves through a predictable sequence. A reader who skims it should be able to answer, in order: who is asking, for how much, why it matters, what they will do, what will change, and what it costs. The components below map to those questions.

The opening and the ask

Lead with the request. Within the first two or three sentences, the reader should know which of their programs you are applying to, what you want to do, and how much money you are asking for. Funders read fast; making them hunt for the amount is the quickest way to lose their attention. A clean opening also signals that you understand their funding and have matched your request to a real program, not a vague hope.

Organization and need

Keep the organizational paragraph short and load it with evidence rather than mission language. One sentence on what you do, one or two on why you can be trusted to deliver. The need paragraph is where many LOIs go soft. The fix is specificity: a local statistic, a recent data point, a concrete description of who is affected. A funder cannot tell the difference between a real problem and a generic one if you only describe it in generalities. For the full treatment of this section in a proposal, see our guide on how to write a statement of need.

Project, outcomes, and budget

The project paragraph answers what you will do and for whom; the outcomes paragraph answers what will be different and how you will measure it. Resist the urge to list activities without naming results. A funder is buying change, not effort. Strong outcomes are expressed as numbers tied to a timeframe, which is exactly the discipline covered in how to write grant goals and objectives. The budget in an LOI is a single line or two: total project cost, the amount requested here, and a note on committed or pending support. Save the line-item detail for the full proposal, where our grant budget guide walks through it.

Ideal length and format

The standard length is one to two pages, single-spaced, with one and a half to two pages being the practical sweet spot. That is enough room to cover all seven components without padding, and short enough that a busy reviewer reads the whole thing. If the funder publishes a page limit or a word count, that number overrides every general rule in this guide. A funder who asks for one page and receives two has learned, before reading a word of substance, that you do not follow instructions.

• On letterhead. Use your organization's official letterhead so the contact information and identity are unmistakable.
• Dated, with a real address block. Include the date and the funder's name, title, organization, and address, exactly as you would in any formal business letter.
• Readable type. An eleven or twelve point serif or clean sans-serif font, with normal margins. Do not shrink the type to cram in more words; cut words instead.
• Signed by a senior person. The executive director or board chair signs, which tells the funder the request is institutional, not one staffer's side project.
• Submitted the way they ask. Many funders now require submission through an online portal that may impose its own field limits and strip your formatting. Read the submission instructions before you write, not after, so the portal does not force a last-minute rewrite.

How to address a program officer

Address the LOI to a specific person, by name, with a courtesy title and last name, for example "Dear Dr. Okonkwo" or "Dear Ms. Alvarez." Find the right contact, usually a program officer or grants manager who handles your issue area, on the foundation's website, its IRS Form 990, or LinkedIn. This is not a nicety. Opening with "To Whom It May Concern" or "Dear Program Officer" is an instant signal that you did no homework and likely sent the same letter to dozens of funders. Reviewers read that as a lack of genuine interest, and it colors everything that follows.

Personalization should go beyond the salutation. Referencing a specific grant the funder has made, a stated priority, or a recent initiative inside the body of the letter shows you understand their work and are not pattern-matching keywords. That single sentence of demonstrated research often does more to earn a second look than another paragraph about your program.

A reusable LOI structure and template

Use the skeleton below as a starting frame, then rewrite every line in your own voice and for the specific funder. A template gets you to a first draft faster; it is not a fill-in-the-blanks shortcut that lets you skip the tailoring.

1. Header. Your letterhead, the date, and the recipient's name, title, organization, and address.
2. Salutation. Dear [Title Last Name].
3. Paragraph 1, the ask. On behalf of [Organization], I am writing to request [amount] from the [Funder's named program] to [one-sentence project]. We are approaching you because [specific reason this funder fits].
4. Paragraph 2, the organization. [Organization] is a [type] founded in [year] whose mission is to [mission]. Last year we [proof point], reaching [number] [people].
5. Paragraph 3, the need. In [place], [the problem, with one concrete figure]. [Why current responses fall short.]
6. Paragraph 4, the project. With this support, [Organization] will [what you will do], serving [who] over [timeframe]. Our approach is [the distinctive method].
7. Paragraph 5, outcomes. We expect to [measurable result, with a number and a date], measured by [method].
8. Paragraph 6, budget. The total project cost is [total]; we request [amount] from [Funder], alongside [committed or pending support].
9. Paragraph 7, the close. We would welcome the opportunity to submit a full proposal and to answer any questions. Please contact [name] at [email and phone].
10. Signature. Sincerely, [Name], [Title], with handwritten or electronic signature.

A full worked example (illustrative)

The following is a fictional LOI written to show the structure in motion. The organization, funder, and figures are invented for illustration. Notice how the ask lands in the first paragraph, the need uses a concrete number, the outcomes are measurable, and the budget is a single line.

Riverside Youth Collective · 14 Marsh Street, Bridgeton, OH 44021

March 4, 2026

Dr. Lena Okonkwo, Program Officer, Education and Opportunity, The Hartwell Family Foundation, 200 Lakeview Avenue, Columbus, OH 43215

Dear Dr. Okonkwo,

On behalf of the Riverside Youth Collective, I am writing to request 40,000 dollars from the Hartwell Family Foundation's Education and Opportunity program to launch After the Bell, an out-of-school tutoring and mentoring program for middle schoolers in Bridgeton's East Ward. We approach Hartwell because of your stated commitment to closing opportunity gaps for rural and small-city youth, the same population our program serves.

Riverside Youth Collective is a community nonprofit founded in 2016 whose mission is to help young people in under-resourced Ohio towns reach their potential. Last year we served 310 youth through summer programming and ran a volunteer mentoring network of 45 adults, with a 92 percent attendance rate across our sessions.

In Bridgeton, fewer than half of eighth graders read at grade level, and the East Ward has no free after-school program within two miles. Working families cannot afford private tutoring, and the public middle school's single counselor serves more than 400 students. The result is that students who fall behind in sixth grade rarely catch up.

With Hartwell's support, Riverside Youth Collective will operate After the Bell three afternoons a week during the school year, serving 60 East Ward students in grades six through eight. Each student is paired with a trained volunteer mentor and receives small-group literacy and math tutoring aligned to their classroom work, with snacks and transportation provided so that participation does not depend on a family's resources.

By the end of the first program year, we expect at least 70 percent of participants to advance one full reading level and to improve school-day attendance by ten percentage points, measured through school-provided assessment data and attendance records shared under a data agreement with Bridgeton Middle School.

The total first-year project cost is 95,000 dollars. We request 40,000 dollars from the Hartwell Family Foundation; the balance is committed through a 35,000 dollar municipal youth grant and 20,000 dollars in individual gifts already raised.

We would welcome the opportunity to submit a full proposal and to answer any questions about the program or our capacity to deliver it. Please contact me directly at d.reyes@riversideyouth.org or 330-555-0148.

Sincerely, Diana Reyes, Executive Director, Riverside Youth Collective

How to tailor an LOI to the funder

The single biggest difference between an invited LOI and a rejected one is fit, and fit is something you demonstrate, not assert. Before you write, study the funder: their published priorities, their geographic and program limits, and the grants they have actually made, which you can read in their Form 990 or grant lists. Our guides on how to find grants and grant writing for nonprofits cover that research in depth.

Then bend the letter toward what you found. Mirror the funder's own language for the problem. Match your requested amount to the size of grants they typically make rather than a number you invented. Name a specific grant or initiative of theirs that your work connects to. If they fund only a particular county or a particular age group, make sure your project visibly falls inside those lines. Tailoring is not about flattery; it is about proving, in concrete terms, that funding you advances a goal they already hold.

Timing, deadlines, and following up

An LOI sits inside a process, and respecting that process is part of the pitch. Some funders accept inquiries year-round and respond on a rolling basis; others open a defined window with a hard deadline, after which the next chance may be a full year away. Read the cycle before you write, and submit early rather than at the last minute, both because portals get congested near deadlines and because an early arrival in a rolling queue can mean an earlier answer.

After you submit, give the funder the time their guidelines state before following up, which is often six to eight weeks. A single brief, polite email confirming receipt and offering more information is appropriate; repeated calls are not. If you are invited to submit a full proposal, treat the LOI as the contract you are now expected to deliver on: the project, the numbers, and the budget in the full application should match what you promised in the letter, because reviewers will compare the two. If you are declined, it is worth asking, once and graciously, whether the funder is open to feedback. Many are not, but the ones who are will tell you whether the problem was fit, timing, or the letter itself, and that intelligence sharpens your next attempt.

What gets you invited versus rejected

The table below contrasts the version of each element that earns a second look with the version that gets a polite no. The difference is almost always specificity and respect for the funder's guidelines.

Common mistakes

Most LOI rejections trace back to a short list of avoidable errors. Watch for these before you submit.

• Ignoring the funder's guidelines. Every funder has its own rules on length, content, and submission method. Missing a page limit or a required attachment can get you screened out before anyone reads your idea.
• Sending a generic letter. A letter that could go to any funder unchanged tells the reader you did no research. Tailoring is the strongest signal of genuine fit, and its absence is the most common reason for rejection.
• Omitting the amount. An LOI without a clear dollar request forces the reader to guess what you need, which they will not do. State the figure in the opening.
• Vagueness. Adjectives like "significant" and "innovative" carry no information. Replace them with numbers, dates, and concrete descriptions of who and what.
• Unmeasurable outcomes. "Improve lives" is not a result a funder can fund or evaluate. Express outcomes as a number tied to a timeframe and a measurement method.
• Burying the lede. If the reader has to reach paragraph four to learn what you want, you have already lost them. Front-load the ask.
• Errors and sloppiness. Typos, the wrong funder's name left in from a previous draft, and broken formatting all undermine credibility on first impression. Proofread, and have someone else read it too.
• Treating it as a formality. Some applicants rush the LOI because the "real" work is the full proposal. But for many funders the LOI is the only thing they read before deciding. Give it full effort.
• Asking for the wrong amount. A request far larger than the funder's typical grant, or one that exceeds a published ceiling, gets cut on sight. Size the ask to what their grant history and guidelines show they actually give.
• Reusing an old letter without updating it. Recycling a prior LOI is fine, but stale figures, an outdated mission line, or a leftover reference to last year's program reads as carelessness. Refresh every fact before it goes out.

A note on federal grants, where the rules shift. Practice varies by agency and changes over time: as of December 2025 the NIH no longer accepts letters of intent, having removed the requirement to reduce applicant burden, while other agencies and programs still require one. Never assume. The funding opportunity announcement is the only authority, a point we return to in how to apply for federal grants.

Next steps

An LOI is a compression exercise: it forces you to say, in two pages, why your project deserves a closer look. The discipline of writing one well, leading with the ask, grounding the need in numbers, and tailoring every line to the funder, makes the eventual full proposal stronger too.

• Draft your LOI with GrantSage, our free AI grant-writing tool, which can turn your project details into a tailored first draft you then sharpen.
• Strengthen the heart of the letter with how to write a statement of need and how to write grant goals and objectives.
• Build the budget you will summarize in one line, and later detail in full, with how to write a grant budget.
• Find the right funders to address in the first place using how to find grants and the broader playbook in grant writing for nonprofits.
• If your prospect is a government agency, read how to apply for federal grants before you write anything.

FAQ

How long should a letter of inquiry be?

One to two pages, single-spaced, is the standard. One and a half to two pages is the practical sweet spot: long enough to cover need, project, outcomes, and a budget figure, short enough that a program officer can scan it in two minutes. If a funder publishes a page or word limit, follow that limit exactly instead of any general rule.

What is the difference between a letter of inquiry and a letter of intent?

The terms overlap and many funders use them interchangeably, but there is a useful distinction. A letter of inquiry is a persuasive mini-proposal that asks for permission to submit a full application and is scored on fit and merit. A letter of intent is often just an administrative heads-up that you plan to apply, sometimes a single paragraph, used so the funder can plan its review workload. Always read the funder's guidelines to see which one they actually want.

What should a letter of inquiry include?

Seven elements: an opening that names the funder and states the amount requested, a short paragraph on your organization and credibility, the need or problem with evidence, your proposed project and approach, the outcomes you will measure, a one-line total budget and project cost, and a close that requests an invitation to submit a full proposal with your contact details.

Who should a letter of inquiry be addressed to?

A specific person by name, ideally the program officer or grants manager who handles your issue area. Find the name on the foundation's website, its IRS Form 990, or LinkedIn. Use a courtesy title and last name, such as Dear Ms. Alvarez. Avoid To Whom It May Concern and Dear Program Officer, which signal that you did no research and sent the same letter everywhere.

Do all grants require a letter of inquiry?

No. Roughly half of foundations use some inquiry step before inviting a full proposal, while others accept full applications directly and some accept no unsolicited requests at all. Federal practice varies and changes: as of December 2025 the NIH no longer accepts letters of intent, while other agencies and programs still require one. The funding announcement or foundation guidelines are the only authority that matters.

What gets a letter of inquiry invited to submit a full proposal?

Clear fit with the funder's stated priorities, a specific and credible request, evidence the problem is real, a realistic budget, and clean writing. The fastest path to rejection is the opposite: a generic letter that ignores the funder's guidelines, a vague ask with no dollar amount, an unmeasurable outcome, or a request outside the funder's geography or program area.