Understanding IRS Letter 5100

08.20.2025

IRS Letter 5100 is a formal and final notice from the IRS Office of Appeals regarding a taxpayer’s challenge to a collection action. It confirms the outcome of the Collection Appeals Program review and directs subsequent actions by the IRS and the taxpayer. Understanding this letter is critical for taxpayers who have engaged in the IRS’s appeals process related to collection actions.

What is Letter 5100?

Letter 5100 is issued by the IRS Office of Appeals as a final response following a taxpayer’s request for a hearing under the Collection Appeals Program (CAP). The CAP allows taxpayers to challenge certain IRS collection actions before they are enforced, such as liens, levies, or the denial of installment agreements.

When a taxpayer files a formal appeal challenging a collection action or a related decision (for example, the refusal to release a lien), the Office of Appeals reviews the case independently. After completing this review, the IRS issues the Letter 5100, communicating the final determination.

This letter confirms one of three outcomes:

    1. Approval of the taxpayer’s appeal – the contested action may be withdrawn or modified.
    2. Denial of the appeal – the IRS will proceed with the original collection action.
    3. Partial approval/denial – some issues may be resolved favorably while others stand.

Letter 5100 serves as the official closure of the CAP appeal process for that matter. It explicitly informs the taxpayer that no further administrative appeal is available within the IRS regarding the challenged action.

Why is Letter 5100 Sent?

This letter is often sent after appeals concerning:

    • Filing or releasing Notice of Federal Tax Liens (NFTLs).
    • Denial or modification of installment agreements.
    • Rejection of requests related to property seizure or release.
    • Resolution of third-party claims on property under levy.

It is important to note that while the letter signals the end of the CAP appeal, taxpayers may have other legal avenues outside this process, such as pursuing remedies in Tax Court, depending on the nature of the dispute.

Relevance for Taxpayers

Receiving a Letter 5100 is a pivotal moment in a tax dispute involving IRS collection activities. It confirms that the IRS Appeals Office has completed its review and the case’s administrative phase has concluded.

What To Do Upon Receipt

    • Review the Letter Carefully: Understand the IRS’s decision. The letter will detail the final outcome and any specific instructions or deadlines.
    • Comply Promptly: If the appeal is denied or partially denied, the IRS will proceed with collection actions such as filing liens or levies. It is critical to respond or act accordingly to avoid further penalties or enforcement.
    • Maintain Records: Keep copies of all correspondence, including the Letter 5100 and any related documents, for your records and possible future reference.

For taxpayers, the Letter 5100 marks the final administrative decision within the IRS Appeals process. While it may feel like an endpoint, it can also be a trigger for seeking other remedies or ensuring compliance to avoid worsening tax liabilities.

We Can Help!

Navigating IRS communications can be complex and sometimes intimidating for taxpayers. At JH Tax Law, we can help you navigate the complexities and safeguard your interests effectively. Understanding this letter and its implications is essential for protecting your rights and making informed decisions.

If you have received Letter 5100 or are facing IRS collection actions, contact our office for a confidential consultation today.