IRS Audit Preparation Guide

What Triggers an IRS Audit

The IRS selects returns for audit through a combination of computer scoring (the DIF score), random sampling, and related-return matching. Some patterns raise the probability more than others:

• Disproportionate deductions — when your Schedule C expenses are unusually high relative to gross receipts, the algorithm notices
• Cash-heavy businesses — restaurants and retail shops with mostly cash income face higher scrutiny because underreporting is easier
• Large charitable donations — claiming $40,000 in donations on $120,000 of income will get a second look, especially without a noncash property appraisal
• Cryptocurrency activity — the IRS added a digital asset question to the front of Form 1040 and is cross-referencing exchange data through John Doe summonses
• Round numbers everywhere — reporting exactly $5,000 in travel, $3,000 in supplies, and $2,000 in meals suggests estimation rather than actual recordkeeping

High income alone increases audit odds. For returns above $1 million, the audit rate historically runs between 2% and 4%. Below $200,000, it drops under 1%.

What to Expect During an Audit

Most audits aren’t the cinematic version where agents show up at your door. The majority are correspondence audits — the IRS mails a letter asking for documentation on one or two line items. You respond by mail, and that’s often the end of it.

Office audits require an in-person meeting at an IRS facility. Field audits happen at your home or business, but these are rare and typically reserved for complex returns or high-dollar discrepancies. The IRS will tell you upfront which items they want to review and what documents to bring.

Here’s the part most people don’t realize: an audit can result in a refund. If the examiner finds you missed a deduction or credit, you get the money back. It doesn’t happen often, but it’s not unheard of either.

How to Prepare Your Records

Preparation is mostly a recordkeeping exercise. The IRS isn’t asking you to justify your entire life — they want documentation for specific items.

• Bank and credit card statements that match the income and expenses on your return
• Receipts or invoices for deductions over $75 (though keeping everything is better)
• Mileage logs if you claimed vehicle expenses — the IRS is strict about contemporaneous records here
• Home office measurements and mortgage/rent/utility statements if you took the actual expense method
• 1099s, W-2s, and K-1s that tie to what was reported

Organize by category, not by date. The examiner will ask about Schedule C travel expenses — hand them the travel folder, not a shoebox of mixed receipts. If you’re self-employed, make sure your quarterly estimated payments are documented as well, since auditors cross-check those against your return.

Your Rights During the Process

The Taxpayer Bill of Rights gives you protections that matter in practice. You have the right to know why the IRS is asking for information, to appeal disagreements within the IRS before going to court, and to representation at any point in the process.

You can also request a different examiner if the one assigned is unreasonable, though this rarely comes up in correspondence audits. If you disagree with the findings, the IRS Independent Office of Appeals reviews cases without cost to you.

When to Get Professional Representation

Simple correspondence audits — where they’re questioning a single W-2 or 1099 — you can handle yourself. Beyond that, having a CPA or enrolled agent is worth the cost. An experienced representative knows what the examiner is actually looking for and can prevent you from accidentally expanding the scope of the audit.

If your audit involves unreported income, business returns, or international filings, professional help isn’t optional. The stakes get real quickly when penalties and interest start compounding. Business owners juggling entity structuring questions alongside an audit need someone who understands both sides of that equation.

The strangest thing about audits: most people who go through one say it wasn’t nearly as bad as they expected. The anticipation is worse than the audit itself.