Nonprofit audits: What they are and why they matter

What is a nonprofit audit?

Most nonprofit leaders hear the word “audit” and immediately picture an IRS letter and a very uncomfortable conversation with their board. The reality is far less dramatic, and for organizations that stay on top of their finances, far less stressful than it sounds.

A nonprofit audit is an independent examination of your organization’s financial records, internal controls, and accounting practices, conducted by a third-party certified public accountant. The auditor reviews your financial statements against generally accepted accounting principles (GAAP), tests key transactions for accuracy, and produces a formal opinion on the overall reliability of your financial reporting.

The goal is not to catch you doing something wrong. It is to provide an objective, credible picture of your organization’s financial health to the stakeholders who rely on it, including your board, your major donors, your grantors, and the communities you serve.

Types of nonprofit audits

Not all nonprofit audits are the same, and understanding the distinctions helps you determine which type applies to your situation.

Independent financial audit. The most common form. A CPA firm reviews your financial statements, evaluates internal controls, tests transactions, and issues a written opinion under GAAP. When people say, “nonprofit audit,” this is almost always what they mean.

Single Audit. Required for organizations that expend $1 million or more in federal awards in a single fiscal year. The Single Audit includes everything in a standard financial audit, plus a compliance review that confirms federal funds were used according to the terms of each award. Nonprofits with significant federal grant portfolios should review this requirement carefully alongside their grant compliance best practices.

Internal audit. Conducted by your own staff or a designated finance committee rather than an outside firm. Internal audits do not provide independent assurance, but they are a strong tool for catching procedural gaps before an external auditor does.

Compliance audit. Focused specifically on adherence to laws, grant agreements, state regulations, or your organization’s own bylaws. Some nonprofits undergo these as standalone exercises; others incorporate compliance testing as part of their annual independent audit.

IRS examination. Rare, and distinct from a financial audit. The IRS may examine a nonprofit’s Form 990 or tax-exempt activities if a discrepancy is flagged. Filing accurately and on time is the most reliable way to avoid one.

Nonprofit audit requirements: Do you need one?

There is no universal federal rule requiring every 501(c)(3) to undergo an independent audit. Whether your organization is required to have one depends on a combination of factors.

Federal funding thresholds. For fiscal years ending on or after September 30, 2025, any nonprofit that expends $1 million or more in federal funds must complete a Single Audit under the updated OMB Uniform Guidance. Organizations that fall below that threshold may still face state-level requirements.

State law. Most states require an independent audit once a nonprofit’s annual revenue or contributions exceed a set threshold, often somewhere between $500,000 and $1 million. Because these thresholds vary significantly by state, every organization should verify requirements with the relevant state charity regulator.

Bylaws and board policy. Some nonprofits have recurring audit requirements written directly into their founding documents. If your bylaws specify it, you are obligated regardless of revenue size.

Grant requirements. Private foundations and institutional funders frequently require audited financial statements as a condition of funding eligibility. Some will accept a financial review in lieu of a full audit for smaller awards, but many will not. Understanding what your funders require well in advance of your next application cycle is a non-negotiable part of strong grant management.

Even when an audit is not required, many organizations choose to conduct one voluntarily. The transparency it signals to donors, watchdog organizations, and prospective funders often makes it worth the investment.

Audit vs. review vs. compilation

If a full audit feels financially out of reach, you have lower-cost alternatives that still provide some level of external financial credibility.

A financial review involves a CPA performing analytical procedures on your financial statements without the depth of testing required in an audit. It offers limited assurance that nothing looks materially wrong, and many smaller grant funders will accept it in place of a full audit.

A financial compilation is the lightest option. A CPA organizes your financial data into GAAP-formatted statements without evaluating their accuracy. It provides zero assurance but gives boards and external parties a standardized view of your finances.

The right choice depends on your size, your funder requirements, and your board’s risk tolerance. Most growing nonprofits will need to work toward a full independent audit as they scale.

Why nonprofit financial transparency builds stronger donor relationships

Here is where most compliance-focused content on this topic stops short. An audit is not just a legal or regulatory exercise. It is one of the most direct signals you can send to the people who fund your mission.

Donors who give at the major gift level, foundations conducting due diligence, and corporate partners evaluating grant eligibility all want the same thing: confidence that their money is going where you said it would go. Clean audited financials provide that confidence in a way no annual report, website, or fundraising email can replicate.

The connection runs deeper than perception. According to Bonterra’s research, declining trust is one of the persistent structural barriers to giving that has kept U.S. charitable giving at roughly 2.5 percent of GDP for decades. Organizational transparency, built partly through practices like regular independent audits, is one of the levers that moves that number. For nonprofits focused on long-term donor retention, audit readiness is not a back-office function. It is part of your fundraising strategy.

A practical nonprofit audit checklist

Preparation is where most audit stress originates. Organizations that keep their records organized year-round consistently report faster, less disruptive audits. Use this checklist as a baseline.

Financial statements and records

• Statement of Financial Position (Balance Sheet) for the audit period
• Statement of Activities (Income Statement)
• Statement of Cash Flows
• Statement of Functional Expenses
• Prior year audited financial statements and management letter
• Bank statements and reconciliations for all accounts

Supporting documentation

• Grant agreements, award letters, and funder correspondence
• Board meeting minutes and approved resolutions
• Donor records and acknowledgment letters for major gifts
• Payroll records, W-2s, 1099s, and any employee benefit documentation
• Expense documentation and vendor invoices
• Schedule of all restricted and unrestricted fund activity

Governance and compliance records

• Current organizational bylaws
• Financial policies and procedures handbook
• IRS determination letter and most recent Form 990
• Any documentation related to major transactions, debt, or lease agreements

Pre-audit preparation steps

• Select your auditor at least three to four months before your fiscal year ends
• Review prior year management letter findings and confirm they have been addressed
• Assign internal roles for audit coordination, document gathering, and auditor communication
• Set up secure shared access for the auditing firm with appropriate permissions

The formal audit process typically runs two to six months from auditor selection through final report delivery. Building that timeline into your fiscal year calendar before the pressure starts keeps the process from compressing into a sprint.

How technology makes audit prep easier

One of the gaps that does not get enough attention in nonprofit audit content is how much your underlying technology stack affects how painful or painless audit season becomes.

Organizations that track restricted and unrestricted funds separately from the start, maintain clean donor records, and document grant activity in real time walk into audit season with most of the work already done. Organizations that reconstruct transaction histories, reconcile mismatched records, and track down missing grant agreements in the weeks before fieldwork begins spending far more time and carry far more risk.

For nonprofits using Bonterra solutions, donation tracking is centralized across campaigns and payment types, which reduces the manual effort required to pull accurate financial data at audit time. Combined with a year-end financial checklist that keeps bookkeeping deadlines on track, the distance between daily operations and audit readiness shrinks considerably.

Building good systems is not an audit-season project. It is a year-round habit.

What happens after your audit

Receiving the final audit report is not the end of the process. It is the beginning of the action phase.

Auditors issue one of four opinion types. An unqualified (clean) opinion means your financials are accurate and your practices are sound. A qualified opinion means the auditor identified specific issues that need to be addressed but found no fundamental

inaccuracy in your overall financial picture. An adverse opinion indicates serious problems with your financial statements. A disclaimer of opinion means the auditor could not complete the examination, often due to missing documentation.

Whatever opinion you receive, the board needs to review the findings in a formal meeting. Any management letter recommendations should be assigned to specific staff with clear timelines for resolution. If your audit uncovered material weaknesses in internal controls, those should be treated as urgent priorities rather than notes to revisit next year.

Auditors have your organization’s best interests in mind. Their recommendations, even when uncomfortable, are a blueprint for building the kind of financial infrastructure that earns and sustains donor confidence for the long term.

Audit readiness as a competitive advantage

In a funding environment where transparency requirements are rising, federal grant thresholds are tightening, and donors have more tools than ever to research organizations before they give, audit readiness is not a burden. It is a differentiator.

Organizations that treat nonprofit financial transparency as a strategic priority rather than a compliance obligation are the ones that attract larger gifts, qualify for more competitive grants, and earn the kind of long-term donor relationships that drive sustainable fundraising growth. The work you do now to keep your financial house in order compounds over time. It shows up in your grant eligibility, your major donor conversations, your year-end appeals, and your ability to expand your mission without hitting financial credibility walls.

The nonprofits that raise the most do not just tell compelling stories. They back those stories with financial practices that make giving to them feel like a sound decision. An audit, done well and repeated consistently, is one of the clearest ways to earn that confidence.

Ready to build the financial systems that support a stronger fundraising operation? Explore how Bonterra’s nonprofit software helps organizations stay organized, donor-ready, and mission-focused year-round at bonterratech.com/product/nonprofits.

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