Got an IRS Audit Letter? Here's Exactly What to Do First

There's a particular kind of stomach-drop that happens when you spot an IRS audit letter — or a state tax audit notice — sitting in your mail. Your mind races. Did I do something wrong? Am I in trouble? Take a breath. In most cases, the answer is no. This guide walks you through exactly how to respond to an IRS audit, the right way, step by step.

We've sat across the table from hundreds of people holding that exact letter. And here's what we tell every single one of them first: an audit is not an accusation. It's a review. The tax agency wants to verify something on your return — and a huge number of audits are settled entirely by mail once the right paperwork shows up.

What actually determines how this goes isn't whether you got the letter. It's how you respond to it. Below is the full playbook: the five first steps, what an audit actually looks like, the mistakes that make things worse, and your rights as a taxpayer.

The 5 First Steps to Take

1. Don't ignore it

   This is the mistake we see most. The letter feels scary, so it gets tucked in a drawer. But every notice comes with a deadline, and if you don't respond by that date, the IRS simply completes the audit without your side of the story — then mails you a report with proposed changes, which almost always means more tax, plus penalties and interest.

   Open it the day it arrives. Even if you're not ready to act, knowing the deadline changes everything.

2. Read the letter carefully

   Your notice is more helpful than it looks. It tells you exactly which tax year is in question, which specific items they're asking about (income, a deduction, a credit), and precisely what they need from you. It also tells you whether this is a mail audit or an in-person one.

   Find the notice or letter number — usually printed in a corner — and circle the response deadline. Confirm the letter is genuinely from the IRS: real audits start by mail, never by a surprise phone call or text.

3. Gather your copies and records

   Pull together the return being reviewed plus anything that backs up the items in question — receipts, 1099s, W-2s, bank and credit-card statements, mileage logs, invoices, canceled checks. Organize them by the specific items the IRS listed, not in one big pile.

   Always keep your originals and send copies. The law expects you to keep records used to prepare a return for at least three years.

4. Respond on time

   Meet the deadline on the letter. If you genuinely need more time on a mail audit, the IRS can usually grant a one-time automatic 30-day extension — but you have to request it (by fax or mail to the address on the letter) before the deadline passes, not after.

   When you mail your response, use a service that gives you delivery confirmation so you have proof the IRS received it.

5. Get a professional in your corner

   You have the right to representation, and you don't have to talk to the IRS alone. A CPA, enrolled agent, or tax attorney can communicate with the agency for you, make sure you provide only what's actually required, and keep a simple document request from snowballing into something bigger.

   This is exactly what we do every week — and it's usually the single biggest factor in how smoothly an audit goes.

What Triggers an IRS Audit?

Most IRS audits aren't random bad luck. Returns are usually selected for a reason, and knowing the common triggers helps you understand why your letter showed up. The most frequent reasons are:

• Computer scoring. The IRS uses a scoring system that flags returns whose numbers look unusual compared to similar taxpayers.
• Document mismatches. If the income on your return doesn't match the W-2s and 1099s the IRS already has on file, that gap can trigger a notice.
• Large or unusual deductions. Deductions that are very large relative to your income — or business losses year after year — can draw a second look.
• Linked returns. Sometimes your return is selected simply because it's connected to another taxpayer or business that was already audited.
• Random sampling. A share of returns are genuinely chosen at random.

How far back can the IRS audit you? Generally the last three years. If the IRS finds a substantial error it can reach back further, but it rarely goes beyond six years. None of these triggers mean you're in trouble — they just mean a number needs a second look.

What a Tax Audit Actually Looks Like

Most people picture an agent showing up at their door. In reality, the majority of audits never involve a face-to-face meeting at all. There are three common formats:

Mail (correspondence) audits are the most common. The IRS sends a letter asking you to mail in documentation for specific items. You respond by mail or fax — done.

Office audits ask you to bring your records to a local IRS office for an interview. Field audits are the most thorough, where an examiner reviews records at your home, business, or your representative's office — and you can choose to have it held at your accountant's office instead of your own.

How long it takes depends on the type of audit, how complex the issues are, how quickly documents are provided, and whether you agree with the findings. An audit ends one of three ways: no change (you backed everything up), agreed (the IRS proposed changes and you accept them), or disagreed (you understand the changes but don't accept them — and you can appeal).

Mistakes That Make an Audit Worse

Your Rights as a Taxpayer

This part matters, and a lot of people don't realize it: you have real, legally protected rights during an audit. Among them — the right to professional and courteous treatment, the right to privacy and confidentiality, the right to know why the IRS wants information and how it'll be used, the right to representation, and the right to appeal a disagreement both within the IRS and in court.

You also don't have to automatically agree to extend the deadline (the statute of limitations) if the IRS asks. These protections exist to keep the process fair — and a good representative will make sure they're respected.

You Really Don't Have to Face This Alone

Here's the honest truth: most of the stress around an audit isn't the audit itself. It's the not-knowing. The second you have someone in your corner who has done this many times before, the whole thing gets smaller.

At Dynamic Tax & Accounting, we treat every client like family — because that's genuinely how it feels to us. Our IRS-licensed Enrolled Agents provide full tax audit representation and IRS audit help: if you've got a letter in hand and your heart's still racing, bring it to us. We'll read it with you, tell you what it actually means, deal with the IRS on your behalf, and handle the response together — for both federal and state tax audits.

Frequently Asked Questions

This article is for general information only and is not tax or legal advice. Tax situations vary, and notices differ by agency and type. Details above reflect general IRS guidance and may change. For guidance on your specific letter, please contact a qualified tax professional.

Got a letter and need help today? See our flat monthly pricing plans starting at $99/month, or book a free consultation. IRS-licensed Enrolled Agents at our Bronx, Jamaica/Queens, Buffalo, and Totowa, NJ offices — plus full audit representation virtually in all 50 states. Call (646) 295-3811 to get started today.