Why would the IRS send me a letter in October?

Asked by: Pinkie Yost  |  Last update: July 20, 2026
Score: 4.7/5 (70 votes)

The IRS (https://www.irs.gov/newsroom/taxpayers-should-open-and-carefully-read-any-mail-from-the-irs) commonly sends letters in October following the October 15 extension deadline, often addressing outstanding balances, adjustments to returns, identity verification, or missing information. These automated notices may also flag discrepancies, such as unreported income or errors in calculations from earlier in the year.

Why would I get a letter from the IRS in October?

There are a variety of reasons the IRS will send a notice or letter. The IRS will send you a letter if there is an issue with your return or to notify you of changes made to your account. They may also be asking you for more information or for payment.

What do IRS audit letters look like?

An IRS audit letter typically contains the taxpayer's name, tax ID number, contact information, and a request for additional documentation to support claims on the tax return. It may also include the name of the IRS officer handling the case and invite the taxpayer to a meeting.

Why is the IRS sending out letters right now?

The IRS sends letters now (typically early in the year or year-round) for various reasons, including matching tax return info to third-party data (like W-2s/1099s), questioning discrepancies, requesting identity verification, notifying of account changes, asking for payments on balances due, or informing you about a return processing delay or change to your return, so you should always open and read IRS mail carefully, as it requires action or provides important info about your taxes, often concerning a discrepancy.
 

What is the most common reason for an IRS letter?

The IRS mails letters or notices to taxpayers for a variety of reasons including:

  • They have a balance due.
  • They are due a larger or smaller refund.
  • The agency has a question about their tax return.
  • They need to verify identity.
  • The agency needs additional information.
  • The agency changed their tax return.

The IRS is Sending Incorrect Letters on Tax Credits

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What triggers an IRS letter?

A notice may reference changes to a taxpayer's account, taxes owed, a payment request or a specific issue on a tax return. Taking prompt action could minimize additional interest and penalty charges.

How do you know if the IRS is investigating you?

You know the IRS might be investigating you through official mail (first contact), phone calls (often with automated messages to IRS.gov), or in-person visits, but signs of a criminal probe include contact with IRS Criminal Investigation (CI) agents, subpoenas to you or your bank, questions to your accountant/bank, unusual account activity (freezing/refusing transactions), or agents suddenly going silent after an audit. Key indicators are official IRS letters, contact from CI special agents, third-party inquiries, and formal summonses for records, signaling serious scrutiny beyond a simple audit. 

Is it always bad news when you get a letter from the IRS?

Most IRS letters and notices are about federal tax returns or tax accounts. Each notice deals with a specific issue and includes specific instructions on what to do. Don't panic. The IRS and its authorized private collection agencies do send letters by mail.

What kind of letters do the IRS send out?

We may send you a notice or letter if: You have a balance due. Your refund has changed. We have a question about your return.

How do I know if I got audited by the IRS?

The IRS performs audits by mail or in person. The notice you receive will have specific information about why your return is being examined, what documents if any they need from you, and how you should proceed. Once the IRS completes the examination, it may accept your return as filed or propose changes.

What month does the IRS send audit notices?

Filers most commonly receive letters from the IRS notifying them of the examination in the fall or winter months of the previous tax filing year. Yet, the auditors can mail the notifications throughout the year.

How do I see IRS letters online?

You can find digital copies of most IRS notices in your online account, under the 'Notices and Letters' section.

How do I know if my tax return has been flagged?

If the IRS decides that your return merits a second glance, you'll be issued a CP05 Notice 1 . This notice lets you know that your return is being reviewed to verify any or all of the following: Your income. Your tax withholding.

What usually comes from the Department of Treasury?

The Department of the Treasury operates and maintains systems that are critical to the nation's financial infrastructure, such as the production of coin and currency, the disbursement of payments to the American public, revenue collection, and the borrowing of funds necessary to run the federal government.

What do IRS audit envelopes look like?

The audit notice will usually come in a plain white envelope with a clear insert to show your name and address. The audit notice will not have a postage stamp on it. It will have a postage meter stamp on it or have no postage at all. These are clues that the notice is actually from the IRS.

Why are people getting letters from the IRS now?

The IRS sends letters now (typically early in the year or year-round) for various reasons, including matching tax return info to third-party data (like W-2s/1099s), questioning discrepancies, requesting identity verification, notifying of account changes, asking for payments on balances due, or informing you about a return processing delay or change to your return, so you should always open and read IRS mail carefully, as it requires action or provides important info about your taxes, often concerning a discrepancy.
 

What triggers the IRS letter 5071C?

Letters 5071C, Potential Identity Theft During Original Processing with Online Option, is mailed to taxpayers to notify them that the IRS received an income tax return using your name, Social Security number (SSN) or individual taxpayer identification number (ITIN).

Will the IRS notice you if there is a problem?

The Internal Revenue Service (IRS) will send a notice or a letter for any number of reasons. It may be about a specific issue on your federal tax return or account, or may tell you about changes to your account, ask you for more information, or request a payment.

How many notices does the IRS send before a lien?

The IRS waits to record most tax liens until after it has sent all five notices in the collection notice stream and hasn't received payment. You'll want to avoid a Notice of Federal Tax Lien. Liens can affect your ability to attract new business clients, secure and maintain credit, and obtain employment.

What looks suspicious to the IRS?

Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit. The IRS mostly audits tax returns of those earning more than $200,000 and corporations with more than $10 million in assets.

Will you be notified if you are under investigation?

The government has no legal obligation to notify you that you're under investigation. There is no constitutional right to know that prosecutors are building a case against you.

How will you know if the IRS is auditing you?

Remember, you will be contacted initially by mail. The IRS will provide all contact information and instructions in the letter you receive. If we conduct your audit by mail, our letter will request additional information about certain items shown on the tax return such as income, expenses, and itemized deductions.