What Is an IRS Tax Audit? Types, Triggers, and Your Rights

Types of IRS Audits

1. Correspondence Audit (Most Common)

• Conducted entirely by mail — you never have to meet an IRS agent in person
• The IRS sends a letter asking for documentation to support a specific item on your return (e.g., a deduction receipt)
• Most common and least severe type of audit
• Respond by the deadline shown in the letter with the requested documents

2. Office Audit

• You are asked to come to a local IRS office for an in-person interview
• Usually involves more complex issues than a correspondence audit
• You can bring a tax professional (CPA, attorney, or enrolled agent) to represent you

3. Field Audit

• An IRS revenue agent visits your home, business, or accountant's office
• Most thorough type of audit — usually reserved for businesses or high-dollar claims
• Having professional representation is strongly recommended

4. Automated Notices (Not True Audits)

• CP2000 notice: IRS detected a discrepancy between your return and information from employers, banks, or brokers (e.g., unreported 1099 income)
• CP501/CP503/CP504: Balance due notices for unpaid taxes
• These are not formal audits but still require prompt response

Common Audit Triggers

While some returns are selected randomly, many are flagged by IRS computer algorithms for specific characteristics:

• High income: Audit rates are higher for incomes over $500,000
• Large or unusual deductions: Deductions significantly above averages for similar income levels
• Self-employment losses: Consistently reporting losses from a business activity
• Claiming the home office deduction incorrectly
• 100% business use of a vehicle
• Cash-intensive businesses (restaurants, retail, etc.)
• Cryptocurrency transactions: Many people have underreported crypto gains
• Unreported income: IRS computers match 1099s and W-2s against your return
• Large charitable deductions relative to income
• Claiming refundable credits incorrectly (EITC, ACTC)
• Foreign accounts or assets that should be reported

What to Do If You're Audited

1. Don't panic. Most audits are routine and resolve without issues for taxpayers who kept good records.
2. Read the audit notice carefully. Understand exactly what the IRS is questioning and what they need.
3. Respond promptly. Never ignore an IRS notice. Always respond by the deadline shown.
4. Gather your documentation. Find receipts, bank statements, and records that support the items in question.
5. Consider professional representation. A CPA, tax attorney, or enrolled agent can represent you before the IRS. You do not have to communicate with the IRS directly.
6. Respond only to what was asked. Don't volunteer additional information not requested.
7. Know your rights. You have the right to appeal any IRS decision.

Your Rights as a Taxpayer

The IRS Taxpayer Bill of Rights provides these fundamental rights:

• Right to be informed about IRS decisions and the basis for them
• Right to quality service from the IRS
• Right to pay no more than the correct amount of tax
• Right to challenge the IRS's position and be heard
• Right to appeal an IRS decision in an independent forum
• Right to finality — to know the maximum time the IRS has to audit (generally 3 years from filing)
• Right to privacy and confidentiality
• Right to retain representation — you can have a CPA, attorney, or enrolled agent represent you
• Right to a fair and just tax system — including the right to seek assistance from the Taxpayer Advocate Service

Statute of Limitations

• The IRS generally has 3 years from the filing date (or due date, whichever is later) to audit your return
• If you underreported income by more than 25%, the window extends to 6 years
• There is NO statute of limitations for fraudulent returns or if you fail to file at all
• Keep tax records for at least 3–7 years after filing