Yes, small businesses do get audited, but the odds are lower than most owners fear. The IRS examined about 0.2% of individual income tax returns for tax year 2022, and partnership and S corporation returns at rates below 0.05%.1Internal Revenue Service. IRS Data Book 2024 Those averages hide real variation. Certain income levels, filing patterns, and industries push the odds up substantially, and a return that looks safe now can still be pulled for review later while the statute of limitations remains open.
The Actual Audit Rates
The IRS publishes examination statistics every year in its Data Book, and the pattern is consistent: most small businesses will never be audited. For tax year 2022, C corporation returns were examined at roughly 0.2%, while partnerships and S corporations came in below 0.05%.1Internal Revenue Service. IRS Data Book 2024 Sole proprietors filing Schedule C face somewhat higher scrutiny, because their business and personal income sit on the same Form 1040 and any inconsistency is easy for the IRS to spot.
Income matters more than entity type. Individual filers reporting total positive income between $50,000 and $200,000 were audited at about 0.1%. The rate rises to 0.9% at the $1 million to $5 million level, and reaches 4.0% for filers above $10 million.1Internal Revenue Service. IRS Data Book 2024 The more money moving through your return, the more likely someone at the IRS looks closely.
Recent-year rates can also climb over time. The IRS notes that examination percentages for a given tax year keep rising as additional audits are opened while the return remains within the statute of limitations. A filing that looked safe six months after submission may still be selected a year or two later.
How the IRS Picks Returns
Computer Scoring
Every filed return runs through the Discriminant Function System, an automated formula that compares your numbers to statistical norms built from years of audit results. It assigns a score reflecting the likelihood that an examination would produce a tax change. A companion score, the Unreported Income DIF, specifically flags returns with signs of missing income.2Internal Revenue Service. The Examination (Audit) Process Returns with the highest scores go to IRS personnel who decide whether an audit is worth pursuing.
Information Matching
The IRS receives every 1099 and W-2 issued in your name. When the income reported on your return doesn’t line up with what payers reported, the mismatch flags automatically. This is one of the most common and most avoidable audit triggers. Cross-check your reported income against every information return you received before filing.
Random Selection
A small number of businesses are chosen purely at random through the National Research Program. These audits aren’t triggered by anything on the return; the IRS uses them to update its statistical models and measure compliance trends.3National Taxpayer Advocate. Compensate Taxpayers for No Change National Research Program Audits An examiner in an NRP audit may request documentation for every line on your return even when the filing is perfectly accurate. The Taxpayer Advocate has called these examinations burdensome, since fully compliant filers effectively serve as test subjects.
What Raises Your Audit Risk
Repeated Losses
Reporting net losses year after year draws attention under 26 U.S.C. ยง 183, the hobby loss rule. If your business shows a profit in at least three of the last five tax years, there’s a legal presumption that you’re operating with a genuine profit motive.4Office of the Law Revision Counsel. 26 USC 183 – Activities Not Engaged in for Profit Missing that threshold doesn’t automatically reclassify your business as a hobby, but it shifts the burden to you to prove you’re trying to make money. If the IRS reclassifies the activity, it can disallow your business deductions entirely.
Deductions That Look Too Large
When expenses look outsized relative to the income the business generates, the DIF score climbs. Home office deductions, vehicle expenses, and meals get watched closely because they’re easy to inflate and hard to verify without detailed records. A landscaping business reporting $80,000 in revenue and $75,000 in deductions attracts more attention than one reporting the same revenue with $40,000 in expenses.
Cash-Intensive Operations
Restaurants, salons, auto repair shops, and other cash-heavy businesses have historically higher non-compliance rates. Cash transactions are easier to underreport than electronic ones, and the IRS steers audit attention accordingly. If you run this kind of operation, meticulous daily records matter more, not less.
Digital Assets
Every major federal business return now includes a yes-or-no question about digital asset activity, including Forms 1040, 1065, 1120, and 1120-S. Answering “yes” and then failing to report the corresponding gains creates an obvious inconsistency. Answering “no” when you actually received or sold cryptocurrency is worse, since the IRS can treat that as a false statement. Starting January 1, 2026, brokers must report cost basis on certain digital asset transactions, which will make information matching in this area far more effective.5Internal Revenue Service. Digital Assets
Employee Retention Credit Claims
The Employee Retention Credit became one of the most heavily promoted and frequently abused tax credits in recent years. The One Big Beautiful Bill introduced enforcement provisions that prevent the IRS from allowing ERC claims for the third and fourth quarters of 2021 when those claims were filed after January 31, 2024.6Internal Revenue Service. ERC Compliance Provisions FAQs Claims processed before the cutoff remain subject to audit. If a promoter convinced you to file an ERC claim you weren’t entitled to, expect that return to face heightened scrutiny.
Worker Classification
How you classify workers, as either employees or independent contractors, is one of the areas examiners look at hardest during a small business audit. The IRS evaluates classification based on the degree of control you exercise over what work is done and how it’s performed.7Internal Revenue Service. Independent Contractor (Self-Employed) or Employee Misclassifying employees as contractors creates exposure for unpaid employment taxes going back years.
What an Audit Actually Looks Like
More than 70% of IRS audits are handled entirely by mail.8Taxpayer Advocate Service. Lifecycle of a Tax Return – Correspondence Audits The IRS sends a letter identifying one or two specific issues, usually earned income tax credit claims, Schedule C expenses, or questionable refund amounts, and asks you to mail supporting documents. You respond with records; the IRS either accepts your documentation or proposes an adjustment. These correspondence audits are the least invasive kind.
Office audits are the next step up. You or your representative meet face-to-face with an examiner at an IRS facility to walk through specific items on the return, such as contractor payments or travel deductions. The scope stays limited to the issues in the notice, but the review is more thorough than a letter exchange.
Field audits are the most comprehensive. A revenue agent visits your business or your accountant’s office, often for several days, reviewing records, observing operations, and inspecting inventory or assets. The scope can cover the entire return, and the agent has authority to follow any thread that surfaces. Field audits are relatively rare for small businesses, but they demand serious preparation when they happen.
For a field examination, the IRS typically sends Letter 2205; for an office examination, Letter 3572. Both identify the tax year and the assigned examiner. You generally have 14 calendar days to respond and schedule an initial appointment.9Internal Revenue Service. Initial Taxpayer Contact on Examination Cases Once the examination begins, the agent issues an Information Document Request on Form 4564 listing every record they need to see.10Internal Revenue Service. Form 4564 Information Document Request Most small business audits wrap within a few months.
You don’t have to face any of this alone. By filing Form 2848, you can authorize an attorney, CPA, or enrolled agent to represent you before the IRS and handle all communications on your behalf.11Internal Revenue Service. Form 2848 – Power of Attorney and Declaration of Representative Having a professional present changes the tone of an audit and helps keep the scope from expanding.
How Far Back the IRS Can Reach
The general rule: the IRS has three years from the date you filed to assess additional tax.12Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection The window stretches to six years if you omit more than 25% of the gross income shown on your return.13Internal Revenue Service. Statutes of Limitations for Assessing, Collecting and Refunding Tax There is no time limit at all in two situations: a fraudulent return filed with intent to evade tax, or a required return you never filed.14Internal Revenue Service. Time IRS Can Assess Tax
Returns filed before the due date are treated as filed on the due date for calculating the three-year window. A 2025 return filed in February 2026 starts the clock on April 15, 2026.
Record retention should match these periods. The IRS recommends keeping records that support items on your return for at least three years in the standard case, six years if there’s any chance income was understated by more than 25%, and indefinitely if you filed fraudulently or didn’t file. Employment tax records should be kept at least four years after the tax is due or paid. Records tied to business property, including depreciation schedules, should be kept until the limitation period runs for the year you dispose of the asset.15Internal Revenue Service. How Long Should I Keep Records Keeping everything for seven years is the safest default.
What It Costs if the IRS Finds Errors
An audit that ends in additional tax doesn’t stop at the tax. Penalties and interest layer on top and can easily exceed the original underpayment.
Accuracy-Related Penalty
Underpayments caused by negligence, carelessness, or a substantial understatement carry a 20% penalty on the underpaid amount. A “substantial understatement” means the correct tax exceeds the reported tax by the greater of 10% of the correct tax or $5,000.16Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments This is the penalty most small business owners run into after an audit adjustment.
Civil Fraud Penalty
When the IRS proves an underpayment was due to intentional fraud, the penalty jumps to 75% of the fraudulent portion.17Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty The IRS carries the burden of proving fraud, but once it establishes fraud on any part of the underpayment, the entire underpayment is presumed fraudulent unless you can prove otherwise by a preponderance of the evidence. This is the highest civil penalty the IRS imposes, reserved for deliberate wrongdoing.
Failure-to-File and Failure-to-Pay
If an audit surfaces a missed filing deadline, the failure-to-file penalty runs 5% of the unpaid tax per month, up to 25%.18Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is a separate 0.5% per month on unpaid balances. When both apply, the failure-to-file penalty is reduced by the failure-to-pay amount so they don’t fully stack, but the combined charge still adds up quickly.
Interest
Interest accrues on all underpayments from the original due date of the return, not from the date the audit closes. For the first quarter of 2026, the rate for individual and small business underpayments is 7% per year, compounded daily.19Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 The IRS adjusts the rate quarterly based on the federal short-term rate plus three percentage points.20Internal Revenue Service. Quarterly Interest Rates On a three-year-old underpayment, interest alone can approach 20% of the original tax.
If you disagree with what the examiner proposes, you have 30 days from the date of the letter to file a written protest requesting a review by IRS Appeals, an office independent from the examination division.21Internal Revenue Service. Preparing a Request for Appeals If appeals doesn’t resolve things, the IRS issues a statutory notice of deficiency, and you have 90 days to file a petition in the United States Tax Court, which lets you contest the tax before paying it.22Internal Revenue Service. Understanding Your CP3219N Notice