The IRS uses certified mail to create a legal record that you received a notice

The Internal Revenue Service sends certified letters when the message matters legally — typically because you owe money, the IRS found a discrepancy in your return, or they need you to respond by a specific date. Certified mail requires a signature, which gives the IRS proof that the letter reached you. This proof protects both you and the agency: it shows you had the chance to respond, and it shows the IRS made a genuine attempt to contact you before taking further action.

A certified letter is not a threat or a sign that you are in serious trouble. It is simply how the IRS handles communications that have legal weight. Many certified letters are routine — a notice that your return was selected for review, a request for missing documents, or a bill for taxes owed. The certified method just means the IRS wants documentation that you saw it.

Key Takeaways

  • Certified mail proves you received the letter, which is why the IRS uses it for notices that require a response or have a deadline.
  • Common reasons for certified letters include tax adjustments, requests for missing information, payment demands, and audit notices.
  • You must sign for a certified letter, but you can refuse it — though refusing does not stop the IRS from proceeding, and you lose proof of the date you were notified.
  • If you miss the deadline in a certified letter, contact the IRS immediately; many deadlines can be extended if you have a valid reason.
  • Keep the certified letter and the green card receipt together; you will need both if you dispute the notice or need to prove when you received it.

When the IRS chooses certified mail over regular mail

The IRS sends most routine notices by regular mail, but switches to certified mail when the communication involves money, a deadline, or a legal action. Specific situations that trigger certified letters include: a notice of tax assessment (you owe additional tax), a demand for payment, an audit notice, a notice of intent to levy (seize your bank account or wages), a notice of intent to file a lien (claim against your property), or a final notice before the IRS takes collection action.

The IRS also uses certified mail when they are proposing to make a change to your return that you have not yet agreed to. For example, if they disallow a deduction you claimed, they send a certified notice explaining the change and giving you a window to respond. The certified method ensures that if you later dispute the decision, the IRS can prove they notified you and gave you time to object.

What happens if you refuse to sign for the letter

You have the legal right to refuse a certified letter. However, refusing does not stop the IRS from proceeding with whatever action the letter announced. If you refuse, the letter is still considered delivered by the IRS, and any deadline in the letter still applies. The difference is that you lose the green card receipt that proves when you were notified, which can hurt you if you later need to show that you acted within the deadline.

If you refuse a certified letter, the postal carrier will leave a notice at your address saying a package is waiting. You can pick it up at the post office, or you can leave it unclaimed. Either way, the IRS will record the delivery attempt and move forward. If the letter contained a payment demand or audit notice, the clock is still running on your response deadline.

How to respond to a certified letter from the IRS

The first step is to open the letter and read it completely. The IRS notice will explain what they found, what they want from you, and by what date you must respond. Most notices include a phone number you can call with questions. If the letter asks for documents — tax records, receipts, proof of a deduction — gather those items and send them to the address listed in the notice, not to your local IRS office.

If the letter is a payment demand and you cannot pay in full, do not ignore it. Contact the IRS at the number in the letter and ask about a payment plan or an offer in compromise (a settlement for less than you owe). If the letter is an audit notice, you can respond by mail with the requested documents, or you can request a meeting with an IRS agent. Keep a copy of everything you send, and send it by certified mail as well so you have proof of delivery.

If you disagree with what the letter says, you have the right to dispute it. The notice will explain how to file a protest or request a hearing. You do not have to accept the IRS's position, but you must respond within the deadline to preserve your right to challenge it.

What to do if you missed the deadline in the letter

If the deadline has passed and you did not respond, contact the IRS immediately. Call the number in the letter or visit your nearest IRS office. Explain that you missed the deadline and ask for an extension. The IRS will sometimes grant an extension if you have a reasonable reason — you were ill, the letter was lost, you did not understand what was required, or you were out of the country.

Do not assume that missing a deadline means the case is closed against you. The IRS often continues to work with taxpayers who reach out late. If you owe money, they may still negotiate a payment plan. If it was an audit, they may still accept your response and reconsider. The worst outcome happens when you ignore the letter entirely and the IRS takes action — like levying your bank account or filing a lien — without hearing from you.

Keeping records of your certified letter

When the certified letter arrives, you will receive a green card (a small receipt card) along with the letter itself. The green card shows the date of delivery and your signature. Keep both the letter and the green card in a safe place. If you ever need to prove that you received the notice on a certain date, or if you need to show that you responded within the deadline, these documents are your evidence.

If you lose the green card, you can request a copy from the post office using the tracking number on the letter. If you lose the letter itself, you can call the IRS and ask them to send another copy. But it is easier to keep them together from the start. Store them with your tax records for that year, and do not throw them away until the IRS case is fully resolved.

Frequently Asked Questions

Does a certified letter from the IRS mean I am being audited?

Not necessarily. The IRS sends certified letters for many reasons: to notify you of a change to your return, to demand payment, to propose a penalty, or to inform you of a lien or levy. An audit notice is one type of certified letter, but most certified letters are not audit notices. Read the letter to see what the IRS actually wants.

Can I have someone else sign for my certified letter?

Yes. A family member, roommate, or anyone at your address can sign for it. However, make sure that person gives you the letter and the green card right away. If the letter sits unopened, the deadline in the notice is still running, even if you did not see it immediately.

What if the IRS sends a certified letter to the wrong address?

If the letter was sent to an old address and you never received it, contact the IRS and explain. Provide your current address and ask them to resend the notice. The IRS may also extend the deadline if you can show that the delay was their error. Keep any evidence that you moved — a change of address confirmation, a utility bill at your new address, or mail forwarding records.

Do I need a lawyer to respond to a certified letter from the IRS?

Not always. Many certified letters are straightforward — you send documents, the IRS reviews them, and the matter is resolved. However, if the letter involves a large amount of money, a complex tax issue, or a collection action like a levy or lien, talking to a tax professional or attorney can help you understand your options and protect your rights.

What if I think the certified letter is a scam?

Real IRS letters come through the postal service and require a signature. Scammers typically use email, text, or phone calls claiming to be the IRS. If you received a physical certified letter in the mail, it is likely real. However, you can verify it by calling the IRS directly at 1-800-829-1040 and providing the notice number from the letter. Do not use a phone number from the letter itself if you suspect fraud.