Choosing the right audit firm can feel overwhelming, especially when you're juggling nonprofit operations and limited budgets. The stakes are high—a weak audit or missed Form 990 filing deadlines can damage donor trust and invite regulatory scrutiny. Let's walk through exactly what to look for and how to evaluate your options.
Why Nonprofit Audits Differ from For-Profit Audits
Nonprofit audits aren't just smaller versions of corporate audits. They require specific expertise in nonprofit accounting standards, fund accounting, donor restrictions, and compliance with IRS regulations unique to tax-exempt organizations. Your auditor needs to understand the nuances of restricted vs. unrestricted funds, revenue recognition for grants, and how to assess internal controls in a nonprofit environment. A general accounting firm may technically be able to do your audit, but one with nonprofit specialization will catch issues and inefficiencies a generalist might miss.
Know Your Audit Requirements
Before you start shopping, clarify what you actually need. Most nonprofits under $500,000 in annual revenue skip the formal audit but may need a review or compilation instead—these are simpler and cheaper (typically $2,000–$5,000 for a compilation). Nonprofits between $500,000–$2 million usually benefit from an audit, which costs $4,000–$15,000 depending on complexity. Organizations above $2 million should expect $10,000–$30,000+. Check your donor agreements, state registration requirements, and grant terms—many funders mandate audits regardless of size.
Form 990 filing is separate but often bundled. A 990-N (e-postcard) is free if you're under $50,000 in revenue. A 990-EZ runs $500–$1,500 to prepare. A full 990 Form typically costs $1,500–$5,000 depending on organizational complexity. Some audit firms include 990 preparation; others charge separately.
Red Flags to Avoid
Don't hire based on price alone. Firms quoting significantly below market rates often cut corners—they may rush fieldwork, miss compliance issues, or deliver late deliverables. Similarly, avoid firms that seem uninterested in your mission or ask vague questions about your operations during initial conversations.
Watch for firms that offer a fixed price without understanding your bookkeeping quality. If your records are disorganized, a competent auditor will quote higher. A firm that doesn't ask about your accounting systems, turnover, or internal controls is likely inexperienced with nonprofits.
Also skip firms that guarantee specific outcomes (like "we'll reduce your audit findings") or promise to negotiate with the IRS on your behalf. Professional auditors maintain independence; they report what they find.
What to Ask Prospective Firms
Call or email at least three candidates. Here are the questions that matter:
- Do you specialize in nonprofits? Ask how many nonprofit audits they completed last year and in your state/subsector.
- Who will lead our audit? You want a partner or senior manager, not a junior staff member.
- Will you prepare our Form 990? If yes, is it included or separate? Is there an extra fee for multi-form returns (990, 990-T, state filings)?
- What's your timeline? Most firms complete audits within 6–10 weeks of fieldwork. Confirm they align with your fiscal year-end and any grant deadlines.
- What do you charge for amendments? If errors appear after filing, will they fix the 990 or audit at no charge?
- How do you communicate with the board? Reputable firms hold an entrance meeting and a closing conference, and provide a management letter outlining findings and recommendations.
- What are your references? Ask for three nonprofits of similar size and ask them directly about responsiveness and professionalism.
Compare and Decide
Create a simple spreadsheet: firm name, audit cost, 990 prep cost, timeline, specialization years, and whether they include a management letter. Don't just pick the cheapest option. A firm that charges $7,000 but delivers thorough work and valuable recommendations often costs less than one charging $4,500 but creating headaches later.
Platforms like Mercoly let you compare audit and Form 990 services from multiple vetted providers in one place, saving you the legwork of vetting firms individually.
Frequently Asked Questions
Q: Do we really need an audit, or can we do a compilation or review instead? A: If donors, grants, or state law don't require an audit, a review (typically $3,000–$8,000) or compilation ($2,000–$5,000) may suffice—they cost less and still give stakeholders reasonable assurance. Check your largest donors' requirements first.
Q: How often should we switch audit firms? A: There's no rule against staying with one firm for years, but rotating every 5–7 years brings fresh perspective and can prevent complacency. Always ensure your new firm provides a smooth transition and requests prior-year work papers.
Q: Can an audit firm also be our ongoing accountant? A: Generally no—auditors must remain independent. They can refer you to bookkeepers or accountants who prepare your records, but they shouldn't prepare the books they're auditing.
Start comparing qualified audit firms today to ensure your nonprofit's financial health and compliance.