A non-profit audit is an independent examination of an organization's financial statements, internal controls, and compliance with accounting standards. For organizations that depend on donor trust, grant funding, and regulatory compliance to operate, audits serve as both a safeguard and a signal of financial credibility.
A non-profit audit is a formal review conducted by an independent auditor to verify that an organization's financial statements are accurate and prepared in accordance with generally accepted accounting principles (GAAP). The auditor examines revenue, expenses, assets, liabilities, and net assets to determine whether the financials the organization presents are reliable.
Unlike a financial review, an audit provides the highest level of assurance on financial statements. The auditor will test transactions, evaluate internal controls, confirm account balances with third parties, and issue an opinion on whether the statements are free of material misstatement. That opinion is what funders, regulators, and board members rely on when making decisions about the organization.
Non-profits might undergo audits for several overlapping reasons.
State law is one of the most common audit triggers. Many states require non-profits to submit audited financial statements once they exceed a certain annual revenue threshold. These thresholds vary by state, but the requirement is tied to the organization's registration to solicit charitable contributions.
Grant funders and government agencies frequently require audits as a condition of funding. Federal grants above $750,000 trigger a Single Audit requirement. Private foundations and institutional donors may impose their own audit requirements regardless of the dollar amount.
Board governance is another cause for audits. It is worth noting that, even in cases where there is no requirement for an audit from any outside agency, most non-profit organizations choose to do audits due to their fiduciary duty.
Audits also play a direct role in maintaining donor confidence and protecting tax-exempt status. Donors, especially major donors and institutional funders, look for audited financials as evidence that an organization is transparent and accountable. An unqualified (clean) audit opinion signals that the organization's financial house is in order.
The type of audit a non-profit needs depends on its size, funding sources, and regulatory obligations. Each type builds on the one before it, adding layers of scrutiny.
A financial statement audit is the standard type of audit type for most non-profits. The auditor will review the financial statements of the organization to establish whether the financial statements are correctly prepared in accordance with GAAP.
This is the most common type of audit required by both state authorities and private financiers, and it results in the issuance of an auditor’s opinion letter to accompany the financial statements.
A Yellow Book audit follows Government Auditing Standards (also called Generally Accepted Government Auditing Standards or GAGAS) issued by the Government Accountability Office. It includes everything in a standard financial statement audit plus additional testing of internal controls and compliance with laws and regulations.
Non-profits that receive government funding often need a Yellow Book audit even if they fall below the Single Audit threshold. The additional requirements focus on whether the organization has adequate controls over financial reporting and whether it's complying with the terms of its government funding.
Non-profits that spend $750,000 or more in federal awards in a fiscal year are generally required to undergo a Single Audit under the Uniform Guidance (2 CFR Part 200). This is the most extensive audit type and goes well beyond standard financial statement review.
A Single Audit examines compliance with federal program requirements, tests internal controls over federal award expenditures, and evaluates whether the organization is meeting the specific conditions attached to each federal grant. The results are reported to the Federal Audit Clearinghouse and are accessible to federal agencies that awarded the funding.
Auditors examining a non-profit focus on areas that are unique to the sector and that carry the highest risk of misstatement or noncompliance.
Most non-profit audits follow a three-phase structure. The timeline varies by organization size and complexity, but the phases themselves are consistent.
During planning, the auditor assesses the organization's risk profile, identifies key accounts and transaction cycles that will receive the most attention, and requests preliminary documentation. This typically includes the prior year's audit report, current-year financial statements, board minutes, grant agreements, and a list of significant transactions or events during the year.
The planning phase also establishes the audit timeline, including when fieldwork will begin, which staff members need to be available, and when the final report is expected.
Fieldwork is where the auditor tests the numbers. This involves selecting sample transactions and tracing them through the accounting system, reviewing supporting documentation (invoices, receipts, contracts, bank statements), confirming account balances with banks and other third parties, and evaluating whether internal controls are operating as designed.
For non-profits with restricted funding, fieldwork also includes testing whether restricted funds were spent in accordance with donor or grantor requirements and whether releases from restriction were properly recorded.
After fieldwork, the auditor compiles findings and prepares the audit report. The report includes an opinion letter stating whether the financial statements are presented fairly. An unqualified opinion (sometimes called a clean opinion) means the auditor found no material issues. A qualified opinion or adverse opinion indicates problems that need attention.
If the auditor identifies internal control weaknesses or other issues that don't rise to the level of a qualified opinion, they may issue a management letter with recommendations. Management letters are not public documents, but they're shared with the board and should be treated as action items rather than filed away.
Audit frequency depends on state law, funder requirements, and the organization's annual revenue. Many states require annual audits once a non-profit's revenue exceeds a specified threshold, which can range from $500,000 to $2 million depending on the state.
Federal grant recipients spending $750,000 or more in federal awards must complete a Single Audit annually. Private funders may set their own thresholds. Some non-profit boards require annual audits as a governance policy regardless of external mandates.
Organizations that aren't legally required to complete an audit may still benefit from doing so every few years, particularly if they're growing, seeking new funding sources, or preparing for a leadership transition.
How well an organization prepares for an audit determines how smoothly the process goes, how much staff time it consumes, and how likely it is to produce a clean opinion.
Begin audit prep well before the auditor arrives. This means assembling key documents (bank statements, grant agreements, board minutes, donor acknowledgment letters), resolving any open reconciling items, and confirming that all journal entries for the period have been posted. Organizations that wait until the auditor requests documents end up scrambling, which extends the timeline and increases the chance of missing items.
Monthly bank and account reconciliations are the single most effective way to reduce year-end surprises. When accounts are reconciled monthly throughout the year, the year-end close is faster, and fieldwork goes more smoothly because the auditor finds fewer discrepancies to investigate.
Written accounting policies and procedures matter during an audit because auditors evaluate whether the organization has a framework for consistent financial management. Key areas to document include revenue recognition practices, expense approval workflows, segregation of duties, and how restricted funds are tracked and released.
The auditor will need access to staff members who can answer questions about specific transactions, processes, and controls. Coordinating availability for the finance team, executive director, and potentially board members or committee chairs before fieldwork begins prevents delays that extend the audit timeline.
Most audit complications stem from a small set of recurring issues that are preventable with consistent practices throughout the year.
For organizations that need help strengthening their financial controls and reporting before an audit, audit and review services can help identify gaps and build audit-ready processes.
Non-profit accounting and audit requirements carry complexities that general-purpose firms don't always handle well, from restricted fund accounting to Single Audit compliance to functional expense allocation. Porte Brown's non-profit accounting team works with organizations across the sector to provide audit, tax, and advisory services built around how non-profits actually operate.
Our team helps non-profit organizations prepare for and complete financial statement audits, Yellow Book audits, and Single Audits. We also work with boards and management teams to strengthen internal controls, improve financial reporting, and address findings from prior audits.
Contact Porte Brown today to discuss how we can support your non-profit's audit and compliance needs.
Yes, non-profits can be audited and often are. Some of the most common triggers include state revenue thresholds that require audited financial statements for charitable registration, federal funding levels that trigger Single Audit requirements ($750,000 or more in federal awards), and funder or board policies that mandate independent audits regardless of legal requirements.
How long an audit takes depends on the organization's size, complexity, and preparedness. A straightforward financial statement audit for a smaller non-profit may take four to six weeks from planning through final report delivery. Larger organizations, those with federal funding requiring a Single Audit, or those with incomplete records can take two to four months. The biggest variable is usually preparation, and organizations that maintain clean monthly reconciliations and organized documentation move through the process faster.
The 33% rule refers to the public support test used to determine whether a non-profit qualifies as a public charity under IRC Section 509(a)(1). To pass, the organization generally needs to show that at least one-third of its total support comes from public sources (individual donations, government grants, and other qualifying contributions) rather than a small number of donors or investment income. Falling below this threshold can reclassify the organization as a private foundation, which carries different tax rules, additional reporting requirements, and restrictions that may affect donor willingness to contribute.
A CPA helps when a non-profit reaches the point where audits are required, grant compliance carries financial risk, or the board needs independent assurance that financial statements are accurate. Organizations with federal funding, multiple revenue streams, or complex restricted fund accounting benefit from working with a CPA who understands non-profit accounting standards and reporting requirements. For smaller non-profits that aren't yet at that stage, a CPA can still help with annual tax filings (Form 990) and internal control reviews.
Non-profits use fund accounting, which tracks resources according to their purpose and any restrictions donors or grantors have placed on them. Financial statements are prepared under GAAP using standards set by FASB (specifically ASC 958), which require non-profits to report net assets in two categories: with donor restrictions and without donor restrictions. Non-profits also report expenses by both their natural classification (salaries, rent, supplies) and their functional classification (program, management and general, fundraising).
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