The IRS notice will tell you exactly what they want to examine. Read it carefully. Audits focus on specific items, not your entire tax return. Gather documentation only for what they’re questioning, though having organized records for everything makes this much easier.

Income documentation comes first. Bank statements showing deposits, 1099 forms you received, invoices you issued, and sales records if you run a business. The IRS is checking whether you reported all the money that came in. Unexplained deposits raise questions, so be ready to explain any large transfers that weren’t income.

Expense receipts support your deductions. The IRS requires documentation showing the amount, date, place, and business purpose. Credit card statements prove you made the purchase but don’t prove what it was for. A $400 charge at Home Depot could be business supplies or backyard landscaping. Receipts tell the full story.

For expenses over $75 and all lodging expenses, the IRS specifically requires receipts. Smaller expenses can sometimes be supported by other documentation, but having receipts for everything eliminates doubt. This is why proper small business tax preparation throughout the year matters so much. The work you do to stay organized pays off if you ever face an audit.

Bank and credit card statements matter beyond just matching transactions. They show the money trail and help verify the business expenses you claimed actually flowed through business accounts.

Asset records include purchase documents, financing agreements, and depreciation schedules for equipment, vehicles, or property. If you claimed depreciation or Section 179 deductions, you need proof of what you bought and when.

Mileage logs are required if you deducted vehicle expenses. The IRS wants date, destination, business purpose, and miles driven for each trip. Reconstructed logs created after receiving an audit notice carry less weight than records kept at the time.

If you claimed home office deductions, bring measurements of your office space and total home square footage, plus mortgage or rent statements and utility bills.

For businesses with employees, have W-2s, payroll records, and 941 filings available. For contractors, have 1099s and any contracts or invoices.

Keep everything organized by category before your appointment or response deadline. Disorganized records make audits take longer and can create the impression that your bookkeeping is sloppy. That invites more scrutiny.

Working with an Enrolled Agent for IRS audit representation gives you someone who handles audit communication directly. They know what auditors look for and how to present documentation in a way that resolves issues efficiently. You don’t have to face the IRS alone.