TLDR
The LOI is the program officer's first look at your organization and project — and the ones that get invited to submit full proposals are not the most eloquently written, they are the ones that demonstrate the applicant understood the funder's priorities and didn't waste a word getting to the point. Approximately 40% of large private foundations use an LOI-first process, with invitation rates ranging from 10–50% depending on how well the funder's priorities are publicized.
Approximately 40% of large private foundations require a letter of inquiry before accepting a full proposal, according to data compiled from Foundation Center grantmaking practice surveys. That means nearly half of all foundation grant applications begin with an LOI, and the decisions made in those 1–3 pages — what to include, what to leave out, how to frame the problem — determine whether an organization ever submits a full proposal to that funder.
LOI Definition and Purpose in the Grantmaking Process
The letter of inquiry exists to solve a workload problem for funders. A community foundation with three program officers cannot review 400 full proposals per grant cycle. An LOI process lets program officers eliminate misaligned applications in 15 minutes rather than 2 hours, reserving substantive review time for the 10–30% of applicants whose project fits the funder’s current priorities.
The LOI is not a mini-proposal. It is a qualification screen. The questions a program officer asks when reading an LOI are binary: Is this organization eligible? Is this project type within our grantmaking scope? Does the geography match? Is the request amount in our range? Is there a compelling enough problem described to warrant asking for more detail?
If all five answers are yes, the LOI advances. None of those questions require a full proposal to answer.
Which Funders Require LOIs vs. Open Applications
Private foundations break into three application structures:
- LOI-first: Submit an LOI; if invited, submit a full proposal. Used by approximately 40% of large foundations (assets over $50 million).
- Open application: Submit a full proposal directly, either on a deadline cycle or rolling basis. More common among community foundations and regional foundations.
- Invitation-only: The funder reaches out to prospective grantees; unsolicited applications are not accepted. Common among family foundations and operating foundations.
Government funders (federal, state, county) rarely use LOI processes. Federal grant programs publish a Notice of Funding Opportunity (NOFO) on Grants.gov and accept full applications on the deadline. Some federal programs require a letter of intent (not LOI) for workload management, but that document is not evaluated.
Before spending time on an LOI, verify the funder’s current application process on their website. Processes change. A foundation that accepted LOIs on a rolling basis last year may have moved to a deadline cycle this year.
Timeline: How LOIs Fit Into the Annual Grant Calendar
LOI processes add 4–8 weeks to the grant development timeline before full proposal work begins. A complete LOI-to-award timeline for a private foundation typically looks like:
- LOI submission deadline
- 4–8 weeks: LOI review and invitation decision
- Invitation to full proposal: if invited, typically with a 4–8 week deadline to submit
- 8–12 weeks: Full proposal review
- Award notification
- 30–60 days: Grant agreement execution and first payment
Total timeline from LOI submission to award: 6–9 months is typical for foundations with defined cycle structures. Foundations with rolling processes are faster but also less predictable.
The implication for annual grant planning: LOIs for the following fiscal year’s funding must begin in the spring or early summer of the current year. An organization that waits until September to identify fall cycle LOIs has missed the planning window for many funders.
Building the annual grant calendar from foundation guidelines — noting LOI deadlines, full proposal deadlines, and board meeting decision dates — and entering them into a compliance tracking system before the fiscal year starts is the practice that prevents missed LOI windows.
The Difference Between an LOI, a Concept Paper, and a Letter of Intent
These three terms are used inconsistently across funders. What matters is what the funder means when they use the term, not a dictionary definition.
Letter of inquiry (LOI): A 1–3 page pre-application screening document that the funder reviews to decide whether to invite a full proposal. The LOI is evaluated.
Concept paper: A 3–5 page document that includes more program detail — a draft logic model, initial evaluation approach, budget overview. Some funders use “concept paper” interchangeably with “LOI”; when they are distinguished, the concept paper is closer to a mini-proposal. The concept paper is evaluated.
Letter of intent: A brief (usually 1-page or shorter) notification to the funder of intent to apply. It is not evaluated. It is used by program staff to estimate review workload and recruit external reviewers. Missing a letter of intent deadline may make you ineligible to apply even if it had no content review.
If a funder’s guidelines use any of these terms, read the surrounding context to understand (1) what length they expect, (2) whether it is evaluated or just a notification, and (3) what information they ask you to include. When in doubt, email the program officer and ask directly. That question is always appropriate.
What Program Officers Do With an LOI
When a program officer opens an LOI, they are scanning for five things in order:
- Geographic eligibility: Does the applicant serve the geography our grants cover?
- Organizational eligibility: Is this a 501(c)(3) in good standing (or a government entity, tribal nation, or other eligible type we fund)?
- Program type alignment: Is the proposed program type one we fund this cycle?
- Request amount: Is the amount within our typical grant range?
- Compelling problem: Is the problem described real, local, and connected to our stated priorities?
An LOI that clears all five screens advances to consideration. One that fails on any of the first four is declined regardless of writing quality.
Program officers reviewing 100 LOIs in a day spend 3–5 minutes per document. The organizational credibility paragraph, the problem statement data point, and the request amount are the three things that determine the outcome in most cases. Everything else in the LOI exists to support those three elements.
Common LOI Rejection Reasons
In order of frequency:
Mission misalignment: The proposed program is not the type the funder funds. A funder focused on early childhood education receiving an LOI for workforce development will decline it regardless of program quality.
Geographic ineligibility: The funder funds a specific county or region; the applicant serves a different area.
Wrong grant amount: The request significantly exceeds the funder’s typical award range. Research foundation 990 filings on GuideStar or ProPublica Nonprofit Explorer to see historical grant amounts before writing the ask.
Organizational ineligibility: The applicant is not a 501(c)(3), or is a 501(c)(3) but in a category the funder excludes (e.g., some foundations do not fund religious organizations or hospitals).
Undifferentiated problem statement: The need statement describes a broad national issue without connecting it to the specific community and funder priority. This is not a technical rejection — the LOI advances but scores poorly in program officer assessment.
How to Request Feedback After a Declined LOI
When an LOI is declined, a brief, professional feedback request is appropriate. Most foundation program officers will respond.
Email format: “Thank you for the time spent reviewing our letter of inquiry for [project name]. We would appreciate any feedback you are able to share on why the project was not a fit at this time, which would help us determine whether to reapply in a future cycle or whether there is a better alignment for our work elsewhere. We respect that you may not be able to provide feedback on all applications and would be grateful for even a brief response.”
Do not express disappointment, push back on the decision, or ask for reconsideration. This email is purely for learning, and a program officer who remembers a professional, gracious response to a decline is more likely to notice favorably when you reapply.
Managing Multiple LOI Deadlines Simultaneously
Organizations with six or more active grant relationships manage LOI deadlines as part of a continuous grant calendar rather than as individual events. The challenge is that LOI deadlines cluster: most private foundations with annual cycles hold spring LOI deadlines (March–May) and fall LOI deadlines (September–November), creating two periods where three to five LOIs may be due within the same two-week window.
Practices that prevent deadline collisions:
Build the annual LOI calendar in January. Pull all funder deadlines for the coming year from the previous year’s guidelines, verify that deadlines haven’t shifted, and enter them in the compliance tracking system with responsible staff assigned.
Assign LOIs to a primary writer 6 weeks before the deadline. LOIs that are not assigned until 2 weeks before due rarely demonstrate the level of funder research that distinguishes successful submissions.
Build a funder-specific LOI template for repeat funders. After the first LOI to any funder, save a template that has the correct framing, the confirmed eligible program types, and the appropriate grant amount range pre-filled. The second LOI requires updating data, not rebuilding structure.
Track LOI status in a grant tracker. An LOI submitted and not tracked is an LOI that generates a missed follow-up. At minimum, record: submission date, submission method, program officer name, expected decision date, and outcome. See the grant reporting calendar template for the full tracking structure that manages LOI, proposal, and reporting deadlines together.
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- Letter of inquiry (LOI)
- A 1–3 page pre-application screening document submitted to a funder before a full grant proposal. The funder reviews LOIs to determine mission alignment and eligibility, then invites a subset of applicants to submit full proposals. LOIs are used by approximately 40% of large private foundations as the first filter in their grantmaking process.
DEFINITION
- Letter of intent
- A brief document submitted to a funder to notify them of a plan to apply for a specific grant program. Unlike an LOI, a letter of intent is not evaluated — it is used by program staff to plan reviewer recruitment and estimate application volume. Federal grant programs (NOFOs) often require letters of intent. They do not affect eligibility or scoring.
DEFINITION
- Concept paper
- A 3–5 page document that is longer than an LOI and shorter than a full proposal, used by some funders as a first screening step. Concept papers typically include more program detail than an LOI — a draft logic model, initial evaluation approach, and basic budget — but less than a full proposal.
DEFINITION
Q&A
What does LOI stand for in grant writing?
LOI stands for Letter of Inquiry. In the grant context, it is a 1–3 page document submitted to a funder before a full proposal, used by the funder to screen applications for mission alignment. LOI is sometimes confused with letter of intent, which notifies a funder of intent to apply but is not evaluated.
Q&A
Do all foundations require a grant LOI?
No. Approximately 40% of large private foundations use an LOI-first process; the rest accept full proposals directly or operate by invitation only.
Frequently asked