IRS Audit Supporting Documents

What Supporting Documents Prove

Supporting documents provide evidence that amounts claimed on your tax return are accurate and allowable. They substantiate income, deductions, credits, and withholding reported on your return.

The IRS requires contemporaneous documentation created at or near the time of the transaction. Reconstructed records or estimates are acceptable only when original documentation is unavailable and you can demonstrate reasonable efforts to obtain it.

Types of Acceptable Supporting Documents

Common acceptable documentation includes:

• Income: W-2s, 1099s, K-1s, bank statements, brokerage statements
• Deductions: Receipts, invoices, cancelled checks, credit card statements
• Business Expenses: Invoices, expense logs, mileage records, profit and loss statements
• Medical Expenses: Bills, insurance statements, explanation of benefits forms
• Charitable Contributions: Receipts, acknowledgment letters from charities, appraisals for non-cash donations
• Mortgage Interest: Form 1098, loan statements, settlement statements
• Education Expenses: Form 1098-T, tuition bills, receipts for required materials

What NOT to Send

• Do not send original documents (copies only)
• Do not provide unclear or illegible copies
• Do not submit documents without labels or explanations
• Do not include irrelevant documents
• Do not send incomplete documentation without explanation
• Do not provide documents that contradict your position

How to Organize Supporting Documents

Proper organization improves audit outcomes:

• Group documents by category matching the audit notice items
• Label each document or group with a clear description
• Number documents sequentially (Exhibit 1, Exhibit 2, etc.)
• Create a cover sheet listing all documents included
• Reference document numbers in your written explanation
• Ensure all copies are clear and complete
• Arrange documents chronologically within each category

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