IRS notice deadlines: how long you have to respond, and how

The short rule: the date on the letter

The IRS's general guidance is simple. If a notice asks you to respond, do it by the due date shown. If you owe money, pay by the due date even if you can't pay in full, because paying on time can reduce interest and penalties. The IRS adds that replying by the due date protects your appeal rights.

So the first job with any IRS letter is to find two dates: the notice date and the response or payment date. Write both on your calendar the day the letter arrives.

Where to find the key details

• Notice or letter number: top right corner, such as CP14 or CP2000.

• Notice date: near the top of the first page.

• Tax year: the return the letter is about.

• Response date or pay-by date: often in a box or bold line.

• What to do: the options and the address, fax or upload route.

Sample (synthetic): Notice date: October 1, 2026. Respond by: October 31, 2026. If we don't hear from you, we will send you a Statutory Notice of Deficiency.

Deadlines for common notices

These are the rules the IRS publishes for some frequent letters. Your own letter always takes priority.

CP2000: proposed changes to your return

The IRS says to respond within 30 days of the notice date, or 60 days if you live outside the United States. If it doesn't hear from you, it says it will send a Statutory Notice of Deficiency.

CP3219A: Statutory Notice of Deficiency

This is a more formal notice. The IRS describes a 90-day response period and says to file any Tax Court petition by the date listed on the notice. Two points matter most:

• Writing back to the IRS doesn't extend the time to file a Tax Court petition.

• The Tax Court can't consider a petition filed late.

If you don't respond or petition, the IRS says it will assess the proposed changes and send you a bill. This is a stage where help from a licensed professional, such as an enrolled agent or CPA, or a Low Income Taxpayer Clinic, can be useful.

CP14: balance due

The IRS refers to the due date on the notice. Paying the full amount by that date avoids further interest. If you can't pay in full, contact the IRS by that date to discuss options.

Letter 5071C: identity verification

Your return generally waits until you verify. The IRS verification page doesn't give a deadline, so check your letter and respond promptly.

If you agree

The IRS says that if you agree with a notice, you don't need to reply unless the notice asks you to. Take any action it requests, such as paying, and keep the letter with that year's tax records. If the notice corrected your return, note the change on your own copy.

If you disagree

Follow the dispute instructions on the notice. Usually that means:

1. Mark the option that says you disagree, if there is a response form.

2. Write a short signed statement: which item is wrong and why.

3. Attach copies of documents that support you, never originals.

4. Send it by the method the notice lists, before the date shown.

5. Keep a copy of everything, with the date you sent it.

If you can't meet the date

Don't let the date pass silently. Call the number on the notice before the deadline and explain. Write down who you spoke to, when, and what they agreed. If you owe money, the IRS offers payment plans, including short-term plans of 180 days or less and longer monthly installment agreements.

For deadlines with fixed legal limits, such as a Tax Court petition, a phone call doesn't change the date. Treat those as hard deadlines.

How to send a reply so it counts

• Upload: many notices, including the CP2000, list an IRS document upload option with an access code on the notice.

• Fax: use the number for your notice's location.

• Mail: use the address on the notice or response form. Consider a method that gives you proof of mailing.

Whatever you choose, put the notice number, tax year and your taxpayer ID on each page you send.

When a deadline has already passed

Act anyway. Call the number on the notice, explain what happened and ask what options remain. Some options may still be open, but they narrow as later notices arrive. If the problem is causing hardship, the Taxpayer Advocate Service, an independent office within the IRS, may be able to help.

Before you rely on any date, check the letter is real

The IRS normally makes first contact by mail. Search the notice number on IRS.gov, check your IRS Online Account, and call a number from IRS.gov if anything feels off. Real notices don't demand gift cards or threaten arrest.

A deadline checklist

• Notice date and response date written down

• Notice number searched on IRS.gov

• Decision made: agree, disagree or partly agree

• Supporting documents copied, not originals

• Reply sent by the listed method, with proof

• Follow-up date set if you hear nothing

Let someone read the dates with you

When a letter mentions several dates, it's easy to pick the wrong one. EasyToDecode, launching soon, will read your own notice, quote each deadline and what the letter says happens if you miss it, and draft questions or a reply you can edit. See how it works or join the waitlist to hear when it opens.