Getting a letter from the IRS can be alarming. Many people assume it means they did something wrong, that they owe money, or that an audit is coming. In most cases, none of those things are true. The IRS sends millions of notices every year — many are routine, some are informational, and only a portion require any action on your part. Knowing how to read a notice and respond correctly removes most of the stress.
Do Not Ignore It
The most important rule: do not set the letter aside. Even notices that turn out to require no action have deadlines. If you miss a response deadline, a simple situation can escalate into a more serious one. Read the notice promptly, understand what it is asking, and if action is required, respond by the date stated.
Find the Notice Number
Every IRS notice or letter has an identifier in the upper right corner — typically a CP number (CP2000, CP501, CP503) or a Letter number (Letter 4464C, Letter 531). Look this number up on IRS.gov to understand exactly what the notice is about before reading the rest. This tells you immediately whether it is a request for information, a proposed change to your tax, a balance due notice, or something else entirely.
Common Notices and What They Mean
Here are the notices people most commonly receive:
- CP2000 — The IRS found income reported by a third party (employer, bank, broker) that does not match what you reported on your return. This is a proposed change, not a bill. Review it carefully — sometimes the IRS has incomplete information and you can dispute it.
- CP501, CP503, CP504 — These are balance due reminders in escalating order of urgency. CP501 is the first reminder; CP504 is a final notice before collection action. If you owe the balance, pay or set up a payment plan. If you believe the balance is wrong, respond in writing.
- Letter 4464C — The IRS is holding your refund while it reviews your return. This is a routine fraud-prevention measure. No action is usually needed — your refund will be released after the review unless they need more information.
- CP12 — The IRS corrected a math error on your return and you are getting a larger refund. No action needed.
- Letter 531 / Notice CP3219A — A notice of deficiency (“90-day letter”). This means the IRS intends to assess additional tax. You have 90 days to file a petition with the U.S. Tax Court if you disagree. This is serious — consider getting professional help.
If You Disagree With the Notice
You have the right to dispute any IRS notice you believe is incorrect. Respond in writing by the deadline stated in the letter. Include a clear explanation of why you disagree and attach any supporting documents — W-2s, 1099s, receipts, or prior correspondence. Send your response by certified mail so you have proof of delivery, and keep a copy of everything you send.
If You Cannot Pay the Balance
If the notice shows a balance you cannot pay in full, do not ignore it hoping it will go away. Contact the IRS to set up an installment agreement — a monthly payment plan. You can apply online at IRS.gov/OPA. Penalties and interest continue to accrue on an unpaid balance, but a payment plan stops collection action while you pay down the debt. In some cases of genuine hardship, the IRS may also accept an Offer in Compromise — a settlement for less than the full amount owed. See our guide on what to do if you can’t pay your tax bill for more detail.
Watch Out for IRS Impersonation Scams
Real IRS notices always arrive by postal mail — not by email, text message, or phone call. The IRS will never demand immediate payment by gift card, wire transfer, or cryptocurrency. If you receive a call or email claiming to be from the IRS, it is a scam. Hang up or delete it. If you are uncertain whether a mailed notice is genuine, you can verify it by calling the IRS directly at 1-800-829-1040 or by logging into your IRS online account at IRS.gov.
This article is for educational purposes only and does not constitute tax, legal, or financial advice. Tax laws change frequently and may vary based on your individual situation. Consult a qualified tax professional before making decisions about your taxes.