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IRS Notices · Updated May 2026

Did You Receive a Notice CP2100? Here’s What To Do

Did You Receive a Notice CP2100? Here's What To Do
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Fresh Start Initiative
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Home Fresh Start Program IRS Notices Taxpayer Problems Articles About Check Your Eligibility
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✓ Editorially independent Reviewed by licensed CPAs Read by 2M+ taxpayers in 2025 Updated monthly $1.2B+ in tax debt resolved 100,000+ Americans served Partner firms are BBB A+ rated only Licensed in all 50 states ✓ Editorially independent Reviewed by licensed CPAs Read by 2M+ taxpayers in 2025 Updated monthly $1.2B+ in tax debt resolved 100,000+ Americans served Partner firms are BBB A+ rated only Licensed in all 50 states
Tax Guide · Updated October 2024
Did You Receive a Notice CP2100? Here's What To Do

TL;DR: Receiving a Notice CP2100 or CP2100A from the IRS can feel overwhelming, especially if you’re unfamiliar with what it means. These notices inform businesses that there’s a discrepancy with taxpayer information, such as an incorrect or missing Taxpayer Identification Number (TIN). This guide explains who qualifies, the rules that apply, and how to apply them to your situation.

Receiving a Notice CP2100 or CP2100A from the IRS can feel overwhelming, especially if you’re unfamiliar with what it means. These notices inform businesses that there’s a discrepancy with taxpayer information, such as an incorrect or missing Taxpayer Identification Number (TIN). Ignoring these notices could lead to backup withholding penalties and other complications. So, if you’ve received one, it’s crucial to act swiftly.

What is a CP2100 Notice?

The IRS issues a CP2100 or CP2100A notice when the TIN and name on certain tax documents, such as Form 1099, don’t match IRS records. These mismatches usually occur because of one of the following reasons:

  • Incorrect or missing TINs
  • Mismatched names and TINs
  • Outdated information from the taxpayer

Essentially, the IRS is alerting you that the information you submitted doesn’t align with their records, and you need to take corrective action to avoid backup withholding.

Why Did You Receive a CP2100 Notice?

If you’ve received a CP2100 or CP2100A notice, it’s likely because the IRS found inconsistencies between the information you reported and their records. These errors are often associated with Form 1099, which reports non-employee compensation and other payments.

The notice includes a list of the accounts with discrepancies, often referred to as “B Notices.” Your responsibility is to reach out to the affected payees and request updated information.

Backup Withholding Explained

If the discrepancies aren’t resolved, the IRS may impose backup withholding at a rate of 24%. This means you’ll be required to withhold a percentage of future payments to the payee until the correct TIN is provided.

Steps to Take After Receiving a CP2100 Notice

Follow these steps to handle a CP2100 or CP2100A notice effectively:

  1. Review the Notice: Carefully examine the notice to identify the accounts or payments with errors.
  2. Notify the Payees: Send the affected individuals a B Notice, requesting updated TINs or corrected name information.
  3. Update Records: Once you receive the correct information, update your records and submit the corrected forms to the IRS if needed.
  4. Implement Backup Withholding: If payees don’t respond or fail to provide accurate information, begin backup withholding on future payments.

Acting quickly ensures you remain in compliance with IRS regulations and avoid potential penalties.

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What Are B Notices and How Should You Handle Them?

B Notices are letters you send to payees listed in the CP2100 notice. These notices inform the recipient about the TIN error and request updated information. There are two types of B Notices:

  • First B Notice: Requests a new W-9 form from the payee.
  • Second B Notice: Requires the payee to contact the IRS directly for a TIN confirmation letter.

Make sure you follow the appropriate steps and timelines for sending B Notices. Failure to comply with these requirements could result in additional fines or penalties from the IRS.

Avoiding Future CP2100 Notices

To prevent receiving future CP2100 notices, consider these proactive steps:

  • Double-check all TINs and names before submitting Form 1099s.
  • Request and maintain updated W-9 forms from all payees.
  • Use IRS’s TIN Matching Program to verify TINs before filing.

Taking these precautions can save you time, money, and stress when tax season rolls around.

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Wrap-Up: Don’t Delay,Take Action Now!

Receiving a CP2100 notice can be stressful, but prompt action helps avoid penalties and ensures smooth business operations. Review the notice, send B Notices, and, if needed, start backup withholding to stay compliant with IRS regulations.

For future peace of mind, implement better record-keeping practices and verify TINs regularly. The extra effort today can save you from costly penalties and headaches in the future.

Need Help Handling a CP2100 Notice?

If you’re unsure how to handle a CP2100 or CP2100A notice, consider consulting a tax professional. They can guide you through the process, ensuring all steps are correctly followed to avoid penalties and maintain compliance.

Your Next Steps:

  • Review your CP2100 notice in detail
  • Send out B Notices promptly
  • Start backup withholding if necessary
  • Contact a tax professional if you need further assistance

Don’t wait,take action today and ensure your business stays compliant with IRS requirements!

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Contact a tax specialist today to explore how to reduce, resolve, or eliminate your back taxes with the IRS Fresh Start Program.

Call us directly at (888) 665-4416 or click the link below.

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Fresh Start Initiative is an independent editorial resource covering IRS tax debt relief. We do not provide tax advice or representation and are not affiliated with the IRS or any government agency. When you request a consultation, we connect you with a licensed, A+ BBB-rated tax relief firm from our vetted network: matched to your situation. Individual results vary.
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