You open your mailbox and there it is…a letter from the IRS. Your heart sinks. Your mind races. Am I in trouble? What did I do wrong?
Take a breath. Most IRS notices are manageable — but only if you respond correctly and quickly. As a former IRS agent who now works as a tax attorney, I’ve seen simple misunderstandings spiral into six-figure nightmares simply because a taxpayer ignored a letter. This guide will walk you through exactly what to do the moment you hear from the IRS.
First: don’t panic — most notices are routine
The IRS sends tens of millions of notices every year. Many are routine, such as a math discrepancy, a missing form, a request for documentation, or a balance due notice. Receiving a letter does not automatically mean you’re under investigation or in serious trouble.
The real danger isn’t the notice itself. It’s ignoring it. When you ignore IRS correspondence, you trigger an automatic escalation: a simple misunderstanding becomes assessed penalties, then liens, then levies on your bank accounts. I’ve had clients come to me after ignoring five, six, or seven notices — and what could have been a quick fix at the start had turned into a nightmare costing thousands of dollars to resolve.
Know your notice: a quick guide to common IRS letters
Not all IRS notices carry the same urgency. Here are four of the most common:
CP2000 — Income mismatch notice: The IRS believes your reported income doesn’t match third-party records. This is a proposal, not a final assessment — you have time to respond and dispute it.
CP504 — Intent to levy your assets: The IRS is preparing for aggressive collection action. Urgent, but not always as immediate as it sounds. Respond and resolve the balance quickly.
Notice of Deficiency — Act within 90 days: The IRS is formally proposing additional tax. You have exactly 90 days to file a Tax Court petition — miss it and the tax becomes legally owed with no right to challenge.
LT11 / Letter 1058 — Final notice of intent to levy: The IRS is preparing to levy your accounts within 30 days. An appeals process is available to stop it, but you must respond immediately.
⚠️ Always check the notice date and the response deadline. IRS deadlines are legally binding. Missing them can permanently forfeit your right to appeal or go to Tax Court.
The five-step IRS response plan
Follow this framework as soon as you receive any IRS notice:
Step 1 — Verify the notice is legitimate: Scam artists send letters that look like IRS correspondence. If anything seems off, call the IRS using a phone number from irs.gov — not the number on the letter. You can also log into your IRS online account to verify any balances and view copies of notices.
Step 2 — Identify what the IRS is claiming: Read the notice carefully. Are they saying you owe money? That your income was underreported? Understanding the specific claim tells you exactly what problem you’re solving.
Step 3 — Gather your documents: Collect everything the IRS is asking for. Proof of payment? Pull your bank records. Filed on time? Find your certified mail receipt. The IRS won’t accept your word alone — always bring documentation.
Step 4 — Respond in writing: A written response creates a paper trail. You can also upload documents electronically or respond via fax, depending on the notice. However you send it, always use certified mail with return receipt so you have proof of timely submission.
Step 5 — Get professional help if the stakes are high: If the amount is significant or the notice is complex, do not go it alone. Missing a deadline can cost you your right to appeal or take your case to Tax Court. A tax attorney can tell you exactly what the notice means, what your options are, and whether this is something you can resolve yourself.
The overlooked factor that can actually win your case
Here’s something most guides won’t tell you: the outcome of most IRS disputes isn’t determined purely by the numbers. It’s determined by how you respond.
A calm, organized, professional response signals to the IRS that you’re a cooperative taxpayer who made an honest mistake — not a target worth pursuing further. A panicked, incomplete, or hostile response does the opposite, and can invite more scrutiny.
When it comes down to it, you’re writing a letter that a human will read, or speaking with a person on the phone, or sitting across from an IRS agent. That human element is the most overlooked part of IRS disputes — and often where you can make the most difference.
Quick reference: what to do when you get an IRS letter
✅ Read the notice immediately
✅ Check the deadline
✅ Verify via irs.gov
✅ Gather your documents
✅ Respond in writing
✅ Seek professional help if unsure
❌ Never ignore IRS correspondence
About the author: Andrew Bosserman is a former IRS agent and practicing tax attorney. He is the author of The IRS Survival Guide, available as a free PDF at TheIRSSurvivalGuide.com.