What is an IRS Audit?
An IRS audit, also called an examination, reviews your records to confirm income, deductions, and credits were reported correctly. It doesn’t automatically mean the IRS suspects wrongdoing. Some returns are pulled entirely at random.
Returns land on the audit list a few different ways.
- Random selection and computer screening. The IRS scores returns against statistical norms built from similar returns audited under the National Research Program. That score is the Discriminant Function System, or DIF, and a higher score means a higher chance of review.
- Related examinations. Your return can get pulled when it involves transactions with another taxpayer already under audit, such as a business partner or investor.
Most audits fall into one of three types. A correspondence audit happens by mail and asks for specific documents. It’s the most common and the narrowest in scope. An office audit brings you or your representative into a local IRS office with the requested records. A field audit takes place at your business or your representative’s office and digs the deepest, sometimes across multiple tax years.
One rule is worth memorizing. The IRS opens every audit by mail. It never starts one with a phone call, email, or text, so any such contact claiming to open an audit is a scam.
How far back can it reach? Generally the last three years. That window stretches to six years when you leave off more than 25% of your gross income, and there’s no time limit at all for a fraudulent return or one you never filed. These limits trace to IRC Section 6501 and the IRS audits overview.
You keep your rights throughout. The Taxpayer Bill of Rights guarantees the right to retain representation, to challenge the IRS position, and to appeal a decision in an independent forum. Every exam ends one of three ways: no change, agreed, or disagreed. Knowing which type you’re facing shapes the right IRS audit help.
Common Audit Issues
Small-business audits cluster around a short list of recurring problems: income that doesn’t match IRS records, oversized deductions, and worker misclassification. These are the areas the automated systems and examiners flag most.
- Underreported income. The IRS receives its own copy of every 1099 and W-2 issued in your name. Its Automated Underreporter program matches those documents against your return, and any gap can trigger a notice.
- Mismatched 1099s and W-2s. A 1099-NEC or 1099-K that never shows up on your return is a direct data-matching flag. Reconcile every information return before you file, because the 1099-K reporting thresholds keep shifting.
- Large or unusual deductions. Write-offs that run high relative to your income, or out of step with your industry, raise the DIF score.
- Home-office, vehicle, travel, and meals. These need contemporaneous logs and receipts. A 100% business-use vehicle claim or an oversized meal deduction invites a closer look.
- Worker misclassification. Treating employees as contractors is a frequent payroll-tax issue. The IRS weighs behavioral control, financial control, and the relationship of the parties.
- Cash-heavy operations and repeated losses. Restaurants, salons, and retail draw scrutiny because cash income is easy to underreport. Year-after-year losses can put the activity into hobby-loss territory.
- Schedule C filings. Sole proprietors self-report income and expenses with no third-party withholding, which carries a higher relative audit rate.
Here’s the perspective that matters. The overall individual audit rate sits near 1 in 200 returns, roughly 0.5% in recent years, per the Taxpayer Advocate Service. Under Treasury direction, the IRS has said it doesn’t plan to push audit rates above historical levels for small businesses and taxpayers earning under $400,000. A low overall rate is cold comfort, though, if one mismatched form pulls your specific return.
Prevention and response are two different jobs. Our companion piece on lowering your audit odds covers how to stay off the list in the first place. This page is about getting through an audit that’s already in motion.
Help With an IRS Tax Audit
The most effective response to an IRS audit is methodical, not defensive: read the notice, meet every deadline, and let a representative handle the IRS. Here’s the sequence that works.
- Read the notice and identify the audit type and tax years. The letter names the return under review, the items in question, the documents to send, and the response deadline. Our step-by-step guide on what to do if you get audited walks through reading that first letter.
- Don’t ignore the deadline. Miss the window and the IRS can assess tax on the information it already has, plus penalties and interest. Need more time? Request an extension before the date passes.
- Gather and organize the exact records requested. Receipts, invoices, canceled checks, bank and credit-card statements, mileage logs, loan agreements, and K-1s for pass-through entities. Provide clean, labeled copies that tie to the line items in question, no more and no less. Our audit preparation checklist covers how to assemble a clean package.
- Reconstruct missing records. If receipts are gone, bank statements and vendor duplicates can rebuild the trail. Documentation always beats an estimate.
- Engage professional representation. Under IRS Circular 230, three types of practitioners have unlimited rights to represent you: a CPA, an enrolled agent, and an attorney. Representation is authorized by filing Form 2848, the Power of Attorney, and you don’t have to sit in the interview yourself.
- Know the timeline. Correspondence audits often close in three to six months when you respond fully. Office and field audits usually run about a year, and a case that goes to appeals can take two or more.
Professional IRS tax audit help means an authorized representative reads the notice, files Form 2848, assembles the documentation, and speaks with the examiner. That person also keeps the exam limited to the issues actually raised and advises whether to accept or dispute the proposed changes.
If you disagree with the findings, you can take the case to the IRS Independent Office of Appeals, which is separate from the office that ran the audit. Audit reconsideration can reopen a completed audit when you have new records the examiner never saw. Qualifying lower-income taxpayers can also get free representation through a Low Income Taxpayer Clinic.
Your Reliable Source for IRS Audit Help
Real IRS audit help starts long before the notice arrives, with books that were already audit-ready when the examiner asked. Indinero keeps your accounting and tax function running month over month, so when the IRS wants records, the answer is already documented.
Here’s what that looks like in practice.
- Audit-ready books year-round. Outsourced bookkeeping and accounting keep transactions categorized, reconciled, and backed by documentation. Records exist before the IRS asks, which is what turns a response from frantic into routine.
- Tax and books under one roof. The team that keeps your books also files your returns. That closes the reconciliation gaps between accounting and tax filings, the gaps that trigger a notice in the first place.
- Real help when a notice lands. We read the letter, identify the records at issue, and help you respond on time and in full. Our licensed professionals can represent your business before the IRS, so you don’t sit across from an examiner alone.
- Continuity that matches the lookback. An audit can reach back three to six years. A partner that has kept your records consistently across that window beats one you hire the week the notice shows up.
This is the bundled model doing its job. Bookkeeping, accounting, tax, and fractional CFO bundled under one monthly engagement means your audit response comes from the same team that built the numbers. It’s a lower-overhead path than hiring a full-time tax attorney or standing up an in-house accounting team only when trouble hits. For a larger exam, a fractional CFO can help steer the response alongside the tax team.
Indinero has run continuous operations since 2009 and serves 500+ regular customers, so the records behind your audit are held by a team that isn’t going anywhere. When you’re ready, our business tax services team can respond to the notice, organize your records, and represent your business through the audit. Reach out for a free consultation. We’d love to learn about your business and find where we can help.
Frequently asked questions
These are the questions business owners ask when the IRS notice lands.
What triggers an IRS audit of a small business?
An IRS audit of a small business is usually triggered by underreported income, mismatched 1099s or W-2s, oversized deductions, worker misclassification, or repeated losses. The IRS matches every information return against your filing, so a single 1099 you leave off can generate a notice. Indinero keeps books reconciled and files the returns from the same records, which closes the accounting-to-tax gaps that trigger most notices.
How far back can the IRS audit a business?
The IRS can generally audit a business for the last three years, extending to six years when you omit more than 25% of gross income. There’s no time limit at all when a return is fraudulent or was never filed. Because an audit can reach back that far, having a partner like indinero that has kept your records consistently since 2009 beats hiring one the week a notice lands.
How long does an IRS audit take?
An IRS audit typically takes three to six months for a mail correspondence audit and about a year for an office or field audit. A case that goes to appeals can run two years or more. Responding fully and on time is the fastest way to close one, which is why indinero handles the notice, assembles the documentation, and speaks with the examiner so the exam stays limited to the issues actually raised.
Can I handle an IRS audit myself, or do I need a professional?
You can handle a simple IRS correspondence audit yourself, but a CPA, enrolled agent, or attorney can represent you and often gets a cleaner result. Under IRS Circular 230, those three practitioners have unlimited rights to represent you once you file Form 2848, so you don’t have to sit in the interview. Indinero’s licensed professionals read the notice, file the power of attorney, and deal with the examiner directly on your behalf.
What records do I need for an IRS audit?
For an IRS audit, you need the exact records the notice requests: receipts, invoices, bank and credit-card statements, mileage logs, and K-1s for pass-through entities. Provide clean, labeled copies that tie to the line items in question, no more and no less. If receipts are missing, bank statements and vendor duplicates can rebuild the trail, and indinero’s year-round bookkeeping means those records already exist before an examiner asks.
What can I do if I disagree with the IRS audit findings?
If you disagree with IRS audit findings, you can appeal to the IRS Independent Office of Appeals, separate from the office that ran the exam. Audit reconsideration can reopen a closed audit when you have new records the examiner never saw. Indinero’s tax team evaluates the proposed changes, advises whether to accept or dispute them, and represents your business through the appeal so you’re not negotiating with the IRS alone.
