Receiving a letter from the IRS is enough to make most people's stomach drop. But an audit notice is not an accusation of wrongdoing — it is a request for verification. Understanding what kind of audit you are facing, what the IRS is actually looking for, and how to respond professionally can dramatically change the outcome.

Our team includes IRS Enrolled Agents and a JD/LL.M. in taxation, which means we have seen every type of audit scenario. Here is what you need to know.

The Three Types of IRS Audits

Not all audits are the same. The type you receive determines how much documentation you need and how the process unfolds.

Correspondence Audit

The most common type — and the least invasive. The IRS sends a letter asking you to verify a specific item on your return, such as a charitable deduction or a business expense. You respond by mail with supporting documentation. Most correspondence audits are resolved without ever speaking to an IRS agent.

Office Audit

You are asked to bring documentation to a local IRS office. These audits typically focus on a few specific issues — often business deductions, rental income, or itemized deductions that appear unusually high relative to your income.

Field Audit

An IRS agent visits your home or place of business. Field audits are the most comprehensive and are typically reserved for complex returns, high-income taxpayers, or cases where the IRS suspects significant underreporting. If you receive a field audit notice, retaining professional representation before responding is strongly advisable.

Why Returns Get Selected for Audit

The IRS uses a scoring system called the Discriminant Information Function (DIF) to flag returns that deviate significantly from statistical norms. Common triggers include:

• Unusually high deductions relative to income (especially home office, meals, and vehicle expenses)
• Unreported income — the IRS receives copies of all 1099s and W-2s and matches them to your return
• Large charitable contributions — especially non-cash donations
• Business losses reported for multiple consecutive years
• Round numbers — claiming exactly $5,000 in business meals every year raises flags
• High-income returns — the audit rate for returns over $1 million is significantly higher than average

Being selected does not mean you did anything wrong. It means your return had characteristics that warranted a closer look.

Your Rights as a Taxpayer

The IRS Taxpayer Bill of Rights gives you important protections throughout the audit process:

• The right to be informed: The IRS must explain the audit process and your rights clearly.
• 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 directly.
• The right to appeal: If you disagree with the audit findings, you can appeal within the IRS or take the matter to Tax Court.
• The right to finality: Once an audit is closed and you have paid any amounts owed, the IRS generally cannot reopen the same tax year.

How to Prepare: A Step-by-Step Approach

Step 1: Read the Notice Carefully

Identify exactly what the IRS is questioning. The notice will specify the tax year, the items under review, and the deadline for your response. Missing the deadline can result in automatic assessment of the proposed changes.

Step 2: Gather Your Documentation

For each item under review, locate:

• Original receipts and invoices
• Bank and credit card statements
• Mileage logs (for vehicle deductions)
• Contracts and agreements
• Prior-year returns for comparison

The IRS operates on the principle that the burden of proof is on the taxpayer. If you cannot substantiate a deduction, the IRS will disallow it.

Step 3: Do Not Over-Respond

A common mistake is providing more information than the IRS asked for. Respond specifically to what was requested. Volunteering additional documentation can open new lines of inquiry.

Step 4: Consider Professional Representation

For anything beyond a simple correspondence audit, working with a CPA, Enrolled Agent, or tax attorney is worth the cost. A professional knows how to communicate with the IRS, what documentation is sufficient, and how to negotiate if there are legitimate disputes.

Step 5: Respond on Time

If you need more time to gather documentation, you can request an extension. The IRS is generally willing to grant reasonable extensions for audit responses — but you must ask before the deadline, not after.

What Happens After the Audit

The audit concludes in one of three ways:

1. No change: The IRS accepts your return as filed. This is the best outcome.
2. Agreed: The IRS proposes changes and you agree. You pay any additional tax, interest, and penalties.
3. Disagreed: You dispute the findings. You can request a conference with an IRS Appeals Officer, and if that does not resolve the matter, you can petition the U.S. Tax Court.

Interest accrues on any unpaid tax from the original due date of the return, regardless of when the audit concludes. Penalties can often be reduced or abated if you have a history of compliance and a reasonable cause for any errors.

The Takeaway

An IRS audit is a serious matter, but it is a manageable one. The taxpayers who fare worst are those who ignore notices, respond without professional guidance, or provide disorganized documentation. The ones who fare best come in prepared, represented, and focused on the specific issues at hand.

If you have received an IRS notice or are concerned about items on a past return, our team can review your situation and advise you on the best path forward. We offer a complimentary 30-minute consultation for all prospective clients.