A grant letter of intent, often called an LOI, is a short pre-proposal document used by some funders to screen fit, estimate review workload, or invite a full application. It is not the same as a proposal cover letter or letter of support, and it should be written only when the funder asks for it.
A grant LOI sits before the full proposal. It is usually shorter, more selective, and more focused on fit. The funder may use it to decide whether to invite a full application, route the project internally, estimate reviewer needs, or reduce the number of full proposals it must process.
Not every funder uses LOIs. Some foundations ask for a letter of inquiry. Some research funders ask for a pre-proposal or concept note. Some programs used to ask for LOIs and no longer do. The most important rule is simple: check the current funding opportunity before drafting. If the funder asks for a concept note rather than a letter, use the grant concept note example to adapt the structure.
This guide connects with grant cover letter, grant proposal template, and startup grant application process. Each artifact belongs at a different stage of the application workflow.
Quick answer: what a grant LOI does
A grant LOI should quickly show who is applying, what problem the project addresses, what work is proposed, why the project fits the funder, what amount or support is being sought if requested, and what outcome the applicant expects. It is not a full proposal, so it should focus on fit and credibility rather than exhaustive detail.
| LOI job | What to show | What to avoid |
|---|---|---|
| Fit | The project matches the funder's purpose, geography, stage, topic, or beneficiary. | A generic statement that could go to any funder. |
| Readiness | The applicant has enough evidence and capacity to justify a full proposal. | A vague idea with no current state. |
| Scope | The project is bounded and fundable. | Trying to include every future ambition. |
| Ask | The requested amount, support type, or invitation request if the funder asks. | A budget too detailed for the LOI instructions. |
| Next step | Whether the applicant seeks an invitation, feedback, or permission to submit. | Assuming the LOI is automatically a full application. |
A strong LOI is specific but not overloaded. It should make the funder want the full proposal because the project appears aligned, credible, and worth review.
For deeptech applicants, that means the LOI should make the uncertainty explicit. The funder does not need the full experimental plan, but it should understand what technical, regulatory, clinical, manufacturing, or market risk the project will reduce. A vague statement that the company will accelerate commercialization is weaker than a short explanation of the evidence the grant will create.
LOI vs letter of inquiry vs cover letter
The terminology is messy. Some funders use letter of intent, letter of inquiry, and letter of interest interchangeably. Others treat them differently. Do not rely on the label alone. Read what the funder asks the document to contain.
| Artifact | Typical timing | Typical purpose | Written by |
|---|---|---|---|
| Letter of intent | Before full proposal. | Signals intent, fit, and basic project scope. | Applicant. |
| Letter of inquiry | Before full proposal, often for foundations. | Asks whether the funder is interested in a full proposal. | Applicant. |
| Concept note | Before full proposal or at first stage. | Summarizes project concept, need, approach, and budget range. | Applicant or consortium. |
| Cover letter | With the application package. | Transmits or explains administrative details. | Applicant. |
| Letter of support | With the application package. | Documents third-party commitment. | Partner, customer, advisor, institution, or collaborator. |
If the funding opportunity uses one term, mirror that term. If it asks for a letter of inquiry, do not label the file Letter of Intent unless the instructions say those are equivalent. Small compliance details matter because they show the applicant can follow directions.
When funders ask for an LOI
Funders ask for LOIs when they want a first screen before full proposal effort. This can protect the applicant from wasting time on a poor fit and protect the funder from reviewing full applications that are outside scope. But requirements vary by program and can change.
- Invitation workflows. Some funders ask for an LOI and invite selected applicants to submit a full proposal.
- Review planning. Some funders use LOIs to estimate reviewer expertise or application volume.
- Eligibility screening. Some LOIs help confirm topic, geography, applicant type, or project stage before a full application.
- Relationship building. Some foundations use letters of inquiry as a light first conversation before requesting more detail.
- No-LOI programs. Some funders do not want LOIs at all. NIH issued NOT-OD-26-019 stating it will no longer request or accept LOIs as part of the application process.
That NIH update is a useful reminder: grant advice changes. A general LOI template can help you think, but it cannot override current policy. Always verify the program page and the latest notice.
What to include in a grant LOI
A grant LOI should answer the funder's first screening questions quickly. The sections may be short, but they should still contain evidence. The funder needs to see that the project is not just interesting; it is relevant to the funding program.
| Section | Purpose | Founder prompt |
|---|---|---|
| Opening | Identify applicant, opportunity, and project. | Who are you, what are you submitting, and why this funder? |
| Problem | Show need or opportunity. | What specific gap, pain, technical barrier, or public benefit motivates the project? |
| Proposed project | Summarize the work. | What will happen during the project period and what output will exist? |
| Current evidence | Show readiness. | What prototype, data, pilot, publication, customer signal, partner, or prior result supports the idea? |
| Fit to funder | Connect to priorities. | Which exact program goal, topic, community, or impact area does this match? |
| Budget range or ask | State request if requested. | What level of support is needed and what will it fund? |
| Next step | Clarify what you want. | Are you requesting invitation, feedback, or permission to submit? |
For deeptech companies, the current-evidence section is often decisive. A funder evaluating a short LOI cannot inspect a full technical appendix. You need to choose the two or three proof points that best show readiness for the next grant-funded milestone.
A simple LOI structure
A practical LOI is usually one to three pages unless the funder specifies otherwise. Keep paragraphs short. Use the funder's words for program fit. Do not attach extras unless the instructions request or allow them.
Paragraph 1: identify applicant, opportunity, and project. Paragraph 2: define the problem and why it matters. Paragraph 3: summarize the proposed work and expected output. Paragraph 4: show current evidence and team readiness. Paragraph 5: explain fit to funder priorities and requested next step.
This structure works as a planning tool even when the funder provides a form. If the portal asks for short fields instead of a letter, answer the same underlying questions: fit, problem, project, readiness, ask, and next step.
Example wording and adaptation notes
The following wording is illustrative. It is not a universal letter, and it should not be submitted without checking funder instructions.
Example opening: Example Sensors Ltd. is submitting this letter of intent to confirm fit for the 2026 Industrial Resilience Innovation Fund. We propose a six-month validation project to test a high-temperature sensor package in industrial process environments where existing monitoring tools fail above sustained operating thresholds.
Example fit sentence: The project aligns with the fund's priority on resilient industrial infrastructure because it produces field evidence needed for safer predictive maintenance in high-heat manufacturing settings.
Example readiness sentence: The company has completed bench testing at prototype level, secured a pilot site letter from an industrial partner, and identified two validation milestones for the grant period: sensor stability under thermal cycling and operator usability in the pilot workflow.
Notice the pattern. The wording does not claim the company will transform the market. It states project, fit, current evidence, and next milestone. That is what a funder needs at the first screen.
A foundation-style letter of inquiry may need a warmer mission connection, while an R&D or innovation program may need a sharper technical milestone. The underlying discipline is the same: fit first, evidence second, ask third. If the funder cannot tell why your project belongs in its program within the first half page, the rest of the LOI has too much work to do.
Funder-specific cautions
LOI rules differ sharply. The wrong assumption can waste effort or create compliance issues. Treat every LOI as funder-specific.
| Funder context | Caution | Practical move |
|---|---|---|
| NIH | NIH no longer requests or accepts LOIs as part of the application process under NOT-OD-26-019. | Do not submit an LOI to NIH unless current official guidance changes or a specific instruction says otherwise. |
| NSF | Some workflows may involve letters of intent or preliminary proposals depending on solicitation. | Check the solicitation and Research.gov instructions before preparing anything. |
| Foundations | Letter of inquiry may be the first formal screen. | Focus on mission fit, need, project summary, budget range, and invitation request. |
| Corporate or philanthropic programs | Terminology and expectations vary widely. | Use the funder's exact requested format and avoid sending unsolicited extras. |
| Consortium programs | A short concept or first-stage proposal may be more important than a letter. | Map partner roles and work packages even in a short document. |
The biggest risk is relying on old examples. A sample LOI from 2022 may be useful for structure but wrong for current policy. Before writing, open the current call page and search for letter of intent, letter of inquiry, pre-proposal, concept note, and required attachments.
Common LOI mistakes
LOIs fail when they are either too generic or too detailed. A weak LOI says the project is innovative but does not show why it fits. An overloaded LOI tries to compress a full proposal into two pages and loses the main point.
- Writing before confirming the funder uses LOIs. Do not create a document the funder does not request.
- Using the same LOI for every funder. The fit paragraph must be rewritten for the program's specific priorities.
- Skipping current evidence. A funder needs to know why this project is ready for a full application now.
- Hiding the ask. If the funder asks for budget range or request amount, state it clearly and connect it to scope.
- Overpromising impact. A short LOI should explain the next credible milestone, not the entire future of the company.
- Confusing LOI with cover letter. A cover letter usually transmits an application. An LOI screens interest before the full application.
Before sending, ask whether the LOI would let a funder make a simple decision: invite, decline, or request clarification. If the letter does not make that decision easier, tighten the project fit, evidence, and next step.
Finally, save the LOI as part of your application history. If the funder invites a full proposal, the later narrative should not drift away from the promise made in the LOI. The budget, milestones, partners, and impact language can become more detailed, but the core project should remain recognizably the same unless the funder explicitly advised a change.
That continuity matters in team settings. If one person writes the LOI and another writes the full proposal, hand over the assumptions behind the letter: target outcome, budget range, partner roles, timing, and evidence claims. Otherwise the full application can accidentally contradict the first screen that earned the invitation.