How Much Does a Small Business Audit Cost?

A financial statement audit for a small private business typically costs $10,000 to $30,000, and the fee climbs with revenue, inventory, the number of locations, and the condition of the books. Before paying for one, check what the bank, investor, or surety is actually asking for, because CPAs offer three levels of service and the two cheaper ones satisfy many requests. A review, which gives limited assurance, typically runs $5,000 to $15,000. A compilation, which gives none, runs $2,000 to $5,000. No public fee survey covers small private companies, so those ranges reflect what firms quote. The best-known published survey sits at the other end of the market: the median S&P 500 audit fee was $7.96 million for fiscal 2024.

What’s the difference between an audit, a review, and a compilation?

The level of assurance the CPA gives, and the work it takes to give it. The AICPA describes the three this way: in a compilation, the CPA doesn’t provide any assurance. A review provides limited assurance. An audit provides “high, but not absolute assurance.”

Service	Assurance	What the CPA does	Typical fee, small private business
Compilation	None	Presents management’s numbers in proper financial statement format	$2,000 to $5,000
Review	Limited	Inquiries of management and analytical procedures on the numbers	$5,000 to $15,000
Audit	High, not absolute	Tests transactions, confirms balances with banks and customers, observes inventory, obtains an understanding of internal controls, issues an opinion on the financial statements	$10,000 to $30,000+

The fee ranges are what CPA firms commonly quote for businesses with roughly $1 million to $20 million in revenue. They aren’t survey data, because nobody publishes a fee survey for private company audits. They match the ranges in our construction CPA cost guide, where surety requirements make this a routine purchase. Nonprofit audits tend to be smaller engagements with their own drivers, and the nonprofit audit cost guide covers those.

Who requires a small business to get an audit?

Almost always a third party, and the requirement is usually in a contract you’ve already signed. The AICPA’s guidance ties the level to the stakes: a compilation suits “initial or lower amounts of financing,” a review fits as a business “seeks larger levels of financing,” and an audit is “often required for complex financing, such as seeking outside investors, seeking to sell a business.”

• Banks. Loan covenants specify the level. Smaller credit lines often accept a compilation or a review, and larger facilities call for an audit.
• Sureties. Bonding companies for contractors move from compiled to reviewed to audited statements as the bonding program grows.
• Investors and buyers. Private equity and strategic buyers commonly want audited statements, or will pay for a quality-of-earnings analysis in their place.
• Government funders. Nonprofits, universities, and state, local, and tribal governments that spend $1,000,000 or more in federal awards in a year need a Single Audit ($750,000 for fiscal years that began before October 1, 2024). For-profit businesses generally fall outside that rule, but a federal agency can write an audit requirement into a for-profit’s award.
• The Department of Labor. A 401(k) plan generally needs its own annual audit once it counts as a large plan, which means 100 or more participants. Since the 2023 plan year, a DOL rule change counts only participants who have an account balance at the start of the plan year, which can put a growing company back under the line.

If a lender’s term sheet says “audited financial statements,” ask whether reviewed statements would be accepted. The answer is often yes, and the question can save $10,000 a year.

What makes the audit fee go up?

Hours, and hours follow risk and mess. Auditors price by estimating the time to test each significant area, and the areas that take the most time are predictable: inventory, complicated revenue, multiple entities or locations, a first-year audit with opening balances to verify, books that aren’t reconciled when fieldwork starts, and a December year end that lands the work in the busiest months of the year.

• Inventory. The auditor has to observe a physical count and test costing. It’s the single biggest driver for product businesses.
• Revenue complexity. Long-term contracts, percentage-of-completion accounting, subscriptions, and multiple revenue streams all add testing.
• Number of entities and locations. Each one adds scoping, and intercompany transactions need to be eliminated and tested.
• First-year audits. The auditor has to get comfortable with opening balances, so year one costs more than year two.
• Weak books. Unreconciled accounts, missing support for transactions, and a client team that takes weeks to answer requests all turn into hours. Auditors call the resulting charges overruns, and they’re billed on top of the quoted fee.
• Timing. A December year end puts your audit into the first quarter, the busiest stretch of the year for CPA firms.

How can I lower the cost?

Get the books audit-ready before the auditors arrive. The fastest way to blow through an audit budget is to have the audit team doing bookkeeping: reconciling accounts, finding invoices, and proposing the adjusting entries that should already have been made. Monthly closes with reconciled balance sheet accounts, a fixed asset schedule that ties to the ledger, aged receivables and payables that match the control accounts, and a folder of signed contracts and loan agreements cut the hours directly.

Independence rules shape who can help. The firm that audits you has to be independent of you, so it can’t make management decisions for you, and the more of your bookkeeping it does, the harder independence is to maintain. Audit readiness is normally handled by a separate accounting firm or a controller, and that’s the work that pays for itself. A business paying $650 to $1,000 a month for a CPA-reviewed monthly close will typically hand its auditors a cleaner file, and get a lower quote, than one that catches up the books once a year. The bookkeeping cost guide covers those prices.

Competition matters too. In the Financial Executives Research Foundation’s 2026 audit fee survey, organizations that put their audit out to bid reported fee reductions of 25% to 30%. That survey covers large companies, but the mechanism is the same at any size. If you’ve had the same auditor for five years without a competing quote, get one.

Is this the same as an IRS audit?

No. A financial statement audit is a service you hire a CPA firm to perform, and it ends with an opinion on your financial statements. An IRS audit is an examination of a tax return, started by the IRS. There’s no fee for an IRS audit itself. What it costs is representation, billed hourly or as a fixed fee by a CPA, enrolled agent, or attorney, and whatever additional tax, penalties, and interest come out of it.

The National Society of Accountants’ 2020-2021 fee survey put the average hourly fee for one kind of IRS-facing work, offers in compromise, at about $201. The audit red flags guide covers what draws an IRS examination, and the statute of limitations guide covers how far back one can reach.

What should I do next?

Read the covenant or contract that’s driving the requirement and find the exact words: “audited,” “reviewed,” “compiled,” or just “CPA-prepared.” Then ask the other party whether a lower level would be accepted. If an audit it is, start the monthly close now, because a clean first-year file is the best negotiating position you’ll have.

• The CPA cost guide covers hourly and monthly CPA pricing across services.
• The fractional CFO cost guide covers the lender packages and board reporting that often travel with an audit requirement.
• The small business accountant cost guide shows where audit and review fees fit in a full accounting budget.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.