What triggers an IRS audit?

IRS audits are triggered by statistical anomalies (your deductions are unusually large compared to similar returns), third-party information mismatches (a 1099 you received doesn't match what you reported), involvement in specific transaction types (large cash transactions, foreign accounts, or cryptocurrency), and random selection. High-income returns and Schedule C self-employment returns face higher audit rates than average.

Can you refuse an IRS audit?

You cannot legally refuse to respond to an IRS audit notice, but you have significant rights in how the audit is conducted. You can request additional time to gather records, have a tax professional respond on your behalf, limit the scope of information you provide, and appeal any findings you disagree with. An enrolled agent, CPA, or tax attorney can represent you at every stage without requiring your direct participation.

How long can an IRS audit go back?

The standard IRS audit period (statute of limitations for assessment) is 3 years from the date your return was filed or due, whichever is later. If you omitted more than 25% of your gross income, the statute extends to 6 years. For fraud or willful tax evasion, there is no statute of limitations. Returns that were never filed also have no statute of limitations.

What documents should you keep in case of an IRS audit?

Keep all records that support items on your tax return for at least 3–7 years, including receipts, bank statements, business expense documentation, investment records, mileage logs, and records of charitable donations. For home purchases and improvements, keep records until 3 years after you sell the home. Digital records are acceptable as long as they are legible and accessible.

Can the IRS audit the same tax year twice?

Generally no. Under IRS policy, the IRS will not re-examine a tax return for a year it has already audited unless you provide substantial evidence of fraud, misrepresentation, or that you failed to report income exceeding 25% of what was reported on the return. If your return was closed with 'no change,' it is rarely re-opened.

IRS Audit Defense: Your Rights and How to Prepare

What Are the Different Types of IRS Audits?

Not all IRS audits are the same. Understanding what type of audit you are facing determines your strategy and timeline.

Correspondence Audit

The most common type — conducted entirely by mail. The IRS requests documentation for a specific item on your return (a deduction, a credit, a reported income figure). These can often be resolved by sending the right documentation with a clear response letter.

Office Audit

You are asked to come to an IRS office to discuss specific items on your return. These are more serious than correspondence audits and typically cover multiple issues. Having representation before you attend is essential.

Field Audit

The most intensive type. IRS Revenue Agents come to your home or business to examine your books, records, and operations firsthand. These typically involve complex tax returns and multiple years of records. Professional representation is not optional at this stage.

TCMP / Research Audit

A statistically random audit that covers your entire return, not just flagged items. The IRS uses these to update its audit selection algorithms.

What Are Your Rights During an IRS Audit?

The Taxpayer Bill of Rights guarantees you several key protections during an audit:

The right to representation: You can have a CPA, enrolled agent, or tax attorney represent you. You do not have to speak to the IRS yourself.
The right to appeal: You can appeal IRS audit findings to the Office of Appeals without going to Tax Court.
The right to privacy: The IRS must treat you with professional courtesy and respect your privacy.
The right to finality: Once a tax year is audited and closed, the IRS generally cannot re-audit the same issues for the same year.

What Is the IRS Actually Looking for During an Audit?

IRS audits are not random fishing expeditions. The IRS uses its Discriminant Information Function (DIF) scoring system to flag returns that deviate significantly from statistical norms for similar returns. Common audit triggers include:

Unusually high deductions relative to income
Schedule C (self-employment) losses year after year
Large charitable deductions
Home office deductions
Cryptocurrency transactions (especially unreported)
Act 60 participation (particularly if residency is questionable)
Income not matching third-party reports (1099s, W-2s)

Why Does Professional Representation Change IRS Audit Outcomes?

You have the legal right to represent yourself in an IRS audit. But every tax professional will tell you the same thing: don't. Here's why:

Audit examiners are trained professionals. An unrepresented taxpayer is at a significant disadvantage.
What you say to the IRS can be used against you. A representative filters communication to protect your interests.
Professional representation typically results in smaller proposed adjustments and lower final tax bills.
Representatives know which deductions to defend aggressively and which to concede strategically.

The single best thing you can do when you receive an audit notice is contact a tax professional before responding to the IRS. Once you have sent documents or statements to the IRS, you cannot take them back. Get your free case review →

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IRS Audit Defense: Your Rights, Your Options, and How to Prepare

What Are the Different Types of IRS Audits?

Correspondence Audit

Office Audit

Field Audit

TCMP / Research Audit

What Are Your Rights During an IRS Audit?

What Is the IRS Actually Looking for During an Audit?

Why Does Professional Representation Change IRS Audit Outcomes?

Get Represented in Your IRS Audit

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