Auditors don't just rubber-stamp your financials—they're trained to spot the gaps and inconsistencies that regulators care about. Understanding what they're looking for helps you prepare smarter, catch problems early, and avoid the costly delays that come with audit findings. Here's what actually triggers scrutiny during a nonprofit audit.
Missing or Incomplete Documentation
Auditors spend significant time requesting supporting documents. If your organization can't produce bank statements, vendor invoices, grant agreements, or board minutes within a reasonable timeframe, you'll face audit delays and potential questioned costs.
The most common documentation gaps include:
- Expense receipts under the materiality threshold. Many nonprofits assume small expenses don't need backup. Auditors test samples regardless of amount.
- Board approval records for significant transactions. Major grants, contracts, or asset purchases need documented board authorization.
- Grant compliance documentation. Time tracking, budget amendments, and compliance certifications for federal and foundation grants are routinely examined.
- Payroll records and tax withholdings. W-2s, 1099s, tax deposits, and payroll register reconciliation matter every audit cycle.
Start organizing documents now rather than scrambling when your auditor calls. Digital systems (spreadsheets or accounting software) that timestamp entries reduce audit friction significantly.
Weak Internal Controls Over Cash and Restricted Funds
Auditors assess whether your organization has checks and balances preventing fraud or error. Nonprofits with single-person approval authority, commingled restricted and unrestricted funds, or no segregation of duties attract heightened scrutiny.
Red flags include:
- One person opening mail, recording deposits, and reconciling bank statements
- Restricted grant funds treated as general operating revenue
- No monthly bank reconciliation or unexplained variances older than 60 days
- Petty cash systems with no supporting receipts
If you're hiring an auditor or form 990 services provider, ask during the proposal stage how they'll assess your controls. Quality providers will conduct a control assessment and recommend specific improvements, not just identify weaknesses.
Related Party Transactions and Conflicts of Interest
Auditors scrutinize payments to board members, staff relatives, or entities that board members own. These aren't automatically problems—they're legal with proper disclosure and arm's-length terms. The issue arises when transactions are undisclosed or priced unfairly.
Document the business rationale for any related party transaction: competitive bidding evidence, board approval, or fair-market-value assessment. If your executive director's spouse provides consulting services, show that the rate matches what you'd pay an unrelated vendor. Transparency and governance process are your best defense here.
Misclassified Revenue or Expenses
Nonprofits sometimes blur the line between program services, management, and fundraising expenses. An auditor might reclassify a portion of your executive director's salary from program to management, or move certain costs out of a restricted grant category.
Be precise with expense coding from day one. If your finance software allows, use sub-accounts that map to Form 990 line items. This prevents surprises when your auditor proposes adjustments.
Inadequate Reserves or Liquidity
While low reserves aren't audit failures, they raise questions about financial sustainability. If your organization carries less than one month of operating expenses in liquid reserves and experiences funding gaps, auditors may comment on this in their management letter—and donors notice too.
Track your days cash on hand monthly. Most auditors recommend 3–6 months for nonprofits with stable revenue and mission-critical operations.
Unresolved Prior-Year Audit Findings
If last year's audit identified questioned costs or compliance issues and you haven't addressed them, expect the auditor to dig deeper this cycle. "We'll fix it next year" doesn't work. Document corrective actions with evidence: policy changes, staff retraining, or system upgrades.
Preparing for Audit Success
Start by gathering three years of financial statements and prior audit reports. Schedule a preliminary call with your auditor in July or August (before the busy fall season) to discuss any changes in operations, staffing, or compliance requirements.
When comparing audit and Form 990 services providers on Mercoly, ask how they define materiality, whether they offer interim reviews, and what their timeline is for fieldwork and reporting. Transparent communication upfront prevents audit surprises.
Frequently Asked Questions
Q: What's a typical nonprofit audit cost, and does it vary by organization size? Audits for nonprofits under $5 million in revenue typically cost $3,000–$8,000; larger organizations pay $10,000–$25,000+. Complexity (multiple locations, federal grants, international operations) increases fees substantially.
Q: How long does a full audit take from start to finish? Most audits take 6–10 weeks from fieldwork start to final report, though a Form 990 filing can happen before the audit is fully complete if needed for tax deadline purposes.
Q: Should we do an audit every year, or only when required? If you're under $250,000 in revenue and receive no federal grants, audits may not be legally required—but many funders demand them anyway. Check your grant agreements and state requirements first.
Compare trusted Audit & Form 990 Services providers on Mercoly to find the right fit for your nonprofit's compliance needs.