Nonprofit Guide to Ensuring Outstanding Letters of Support

Two equally qualified nonprofits submit grant proposals for the same funding opportunity. Both have solid track records, clear project plans, and compelling budgets. However, one application includes powerful letters of support from community leaders, partner organizations, and program beneficiaries, while the other stands alone. Which proposal do you think the funder will choose?

In the competitive fundraising landscape, a letter of support can be the factor that elevates your grant application above the rest. These documents provide external validation that transforms your organization's claims from self-promotion into community-backed evidence of impact and necessity.

This guide will provide tips for leveraging the power of strategic support letters to strengthen your grant proposals, build funder confidence, and ultimately secure more financial resources for your critical work.

What Is a Letter of Support?

A letter of support is a formal endorsement document written by a third party who affirms their backing of your project, mission, or collaboration. Unlike a reference letter or testimonial, which typically focuses on past performance, a letter of support specifically endorses a proposed project or ongoing work that requires funding.

These documents differ from letters of commitment or memorandums of understanding (MOUs) in that they express support and endorsement rather than binding commitments of resources or services. A support letter is essentially a persuasive letter that validates your organization's credibility and the importance of your work to the broader community.

The letter format should follow professional business standards, including proper letterhead, salutation, and contact information.

Build Trust and Showcase Value

Grantmakers frequently require or strongly encourage letters of support, particularly for collaborative projects or community-based initiatives. And these documents serve several critical functions in your grant proposal.

First, they build trust with funders by demonstrating external validation of your work. When community leaders, partner organizations, or beneficiaries vouch for your proposed project, it provides independent verification of your claims and capabilities.

Secondly, letters of support showcase your organization's relationships and community connections. They prove that your nonprofit doesn't operate in isolation but has meaningful partnerships and stakeholder engagement. This is particularly important for initiatives that require community buy-in or collaborative implementation.

Finally, these endorsements can address specific evaluation criteria that funders use to assess applications. Many grant applications are scored based on factors like community need, organizational capacity, and stakeholder support – all areas where strong letters can provide compelling evidence.

Who Should Write These Letters?

The most effective support letters come from individuals and organizations with genuine connections to your work and credible perspectives on your impact, such as:

• Partner Organizations and Collaborators: Other nonprofits, government agencies, and businesses that work alongside your organization can best speak to your collaborative abilities and shared goals. Their endorsement carries weight because they understand your operational capacity firsthand.
• Community Leaders and Officials: Local politicians, school superintendents, police chiefs, and other civic leaders can attest to community need and your organization's role in addressing local challenges. Their positions give them credibility with funders who want to see official recognition of your work.
• Past or Current Beneficiaries: The people your organization serves can provide powerful testimonials about your impact. Their personal stories and specific examples of how your programs have helped them are ideal for creating emotional connections with funders.
• Industry Experts and Professionals: Researchers, consultants, and professionals in your field can speak to the quality and innovation of your approach. Their expertise lends academic or professional credibility to your methods and goals.

Key Components of an Effective Letter of Support

Every letter of support should include several essential elements that make it credible and compelling.

The first paragraph should clearly identify the writer, their title and organization, and their relationship to your nonprofit. This establishes their authority to provide an endorsement and helps funders understand why their opinion matters.

The statement of support should be explicit and enthusiastic. Writers should clearly state that they endorse your organization and the specific proposed project. Vague or lukewarm language undermines the letter's effectiveness.

Specific examples and key points about your organization's impact are crucial. Generic praise like "they do good work" is far less effective than concrete stories or data about your achievements. Writers should include brief descriptions of your track record, specific programs, or measurable outcomes they've witnessed.

The letter should demonstrate clear alignment between your proposed project and the funder's goals. Writers who can articulate why your initiative matters to the broader community or field show funders that your work serves important purposes beyond your organization's interests.

Finally, proper formatting and contact information are essential. Letters should be on official letterhead when possible, include proper headings, and provide complete contact information so funders can verify the endorsement if required.

Tips for Requesting and Writing Strong Letters

Successfully securing impactful support letters requires strategic planning and clear communication.

Consider the following step-by-step approach:

• Start Early: Request letters well in advance of your grant application deadline. Give writers at least 2-3 weeks to craft thoughtful endorsements, and follow up politely if you don't hear back within a reasonable timeframe.
• Provide a Template or Outline: Many busy professionals want to support your work but need guidance on what to include. Offer a template or example letter that highlights key points while allowing writers to personalize their endorsements. This approach ensures consistency while reducing the burden on your supporters.
• Tailor Each Request: Different funders have different priorities, and your letters should reflect this reality. When possible, provide writers with information about the specific funding agency and how your project aligns with their goals.
• Make it Personal: The most effective letters include personal relationships and specific stories rather than generic endorsements. Encourage writers to share their direct experiences with your organization or to explain why they personally believe in your mission.
• Proofread Everything. Twice: Even when others write your support letters, you're responsible for making sure they meet professional standards. Review each letter for typos, formatting issues, and completeness before including them in your grant proposal.

Common Mistakes to Avoid

Several pitfalls can undermine the effectiveness of your support letters, including:

Irrelevant Endorsers: Letters from people with no genuine connection to your work are easily spotted by experienced grant reviewers. A "to whom it may concern" letter from someone who clearly doesn't know your organization well can actually hurt your application.

Boilerplate Language: Using identical or overly similar language across multiple letters makes them appear manufactured rather than genuine. Each letter should feel authentic and specific to the writer's perspective.

Poor Formatting: Letters that don't follow proper business letter format, lack letterhead, or contain typos reflect poorly on both the writer and your organization's attention to detail.

Missing Information: Incomplete contact information, unclear writer credentials, or vague endorsements fail to serve their purpose of providing credible third-party validation.

Sample Letter of Support Structure

An effective support letter typically follows the following structure:

• Opening: A professional salutation followed by an introduction of the writer, including their title, organization, and relationship to your nonprofit.
• Statement of Support: A genuine, enthusiastic endorsement of your organization and the specific proposed project or initiative.
• Evidence and Examples: Specific stories, data, or observations that demonstrate your organization's effectiveness and the importance of your work.
• Alignment with Funder Goals: An explanation of how your project serves broader community needs or advances important objectives in your field.
• Closing: A strong concluding statement that reiterates support and offers to provide additional information if needed.
• Signature Block: The writer’s full contact information and signature on official letterhead when possible.

Letters of support are powerful tools that can significantly strengthen grant applications and improve your fundraising success. Remember that the most persuasive letters come from authentic relationships and specific knowledge of your work's impact. Invest time in cultivating these relationships before you need support letters, and always approach potential endorsers with clear information about your needs while showing appreciation for their time.