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Published:   |   Last Updated: May 26, 2026

Collection Sorting Station — IRS Categorizes Taxpayer’s Case

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Overview

When you as a taxpayer don’t resolve your tax liability after receiving IRS letters or phone calls, the IRS categorizes the case and routes it to one of the following areas:

  • Field Collection 
  • Automated Collection System (ACS) 
  • Case Not Assigned (Shelved) 
  • Case Waiting for Assignment (Queue) to Field Collection 

You may receive various notices or letters from the IRS requesting payment of the tax balance due and/or the filing of missing tax returns.

I need more information

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If your case is assigned to the Automated Collection System (ACS)

  • ACS and ACS Support groups work the ACS inventory, send letters through the ACS system, and answer ACS phone calls generated from ACS letters. 
    • ACS caseworkers can help resolve balance due accounts and secure missing tax returns. 
    • ACS can place your account in currently not collectible (CNC) if your financial situation is a hardship. 
    • ACS can issue levies and file liens when there is no taxpayer response. 
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If your case is assigned to Field Collection

  • Field Collection involves Revenue Officers (ROs) who contact taxpayers to resolve balance due accounts and secure missing tax returns.  
    • ROs send various letters while they work to resolve each assigned case. 
    • ROs may request financial information and determine when a taxpayer is in financial hardship and should be placed in a CNC status. 
    • ROs may take collection actions, such as filing liens and issuing levies, when there is no taxpayer response to their contacts 
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If your case is assigned to the Queue

The Queue is an electronic holding area for taxpayer cases awaiting assignment. The IRS computer system may generate systemic letters and take systemic actions while the case is awaiting assignment.  

You should continue to read and respond to any IRS notice or letter and consider payment options while your case is in the queue.

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If your case is Shelved

Shelved cases are those not actively being worked by IRS employees for various reasons. The IRS computer system may generate systemic letters and take systemic actions while a case is in shelved status. 

You should continue to read and respond to any notice or letter you receive and keep your address current with the IRS.

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How did I get here?

You have a balance due on your tax account and/or you have one or more delinquent tax return, so your case is being assigned to a Collection area. 


It is important that you read each letter or notice. You may be able to request a short-term or long-term payment plan. If you are unable to pay your liability in full within the time frame for a payment plan, you may qualify for a partial payment installment agreement.  You can also call the IRS and an employee can assist you with other options, such as an OIC and CNC status.

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What are my next steps?

When you are contacted by the IRS about a balance due or missing returns, respond as soon as you can to prevent unwanted collection actions, such as a levy on bank accounts or wages.  

If the notice or letter is it’s from the IRS, it will have instructions on how to respond and will provide a website address for you to visit for additional information. Visit I Got a Notice From the IRS for further details including what to do if the notice is not from the IRS.

If you disagree with the notice, call the IRS at the toll-free number on the top right corner of your notice. Please have your paperwork (such as cancelled checks, amended return, etc.) ready when you call. See Publication 5, Your Appeal Rights and How to Prepare a Protest If You Don’t Agree.

If you can’t pay the full amount by the date on your notice, review the payment options that might work for your situation, and contact the IRS to set up a payment plan or discuss other ways to address your balance. Make sure you:

  • Respond directly to the IRS Collection contact listed in the letter to discuss options and to prevent collection actions like levy and liens.   
  • You may sign into your individual online account to view your balance, make payments, and create or manage a payment plan. 
  • If you are not assigned to ACS or Field Collection, you may discuss your balance and payment options over the phone by calling the phone number in your notice, 800-829-1040 (individual), or 800-829-4933 (business). 
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Additional Information

Being proactive in addressing the tax debt may help reduce additional penalty and interest charges and eliminate the need for the IRS to take action to collect the balance. See Notice 746, Information About Your Notice, Penalty and Interest. 

If you believe you have an acceptable reason for interest or a penalty to be removed or reduced, you may complete Form 843, Claim for Refund and Request for Abatement, or send a signed statement to the IRS explaining your reasons why.

Depending on the amount you owe, you may receive a notice explaining the denial or revocation of your United States passport. Visit Revocation or Denial of Passport in Case of Certain Unpaid Taxes for further information. 

You may wish to check your tax withholding to make sure you have enough taken from your paycheck each pay period or that you have made an accurate estimated tax payment to help avoid a balance due at the end of the year. You may use the IRS withholding calculator to help determine whether to adjust your federal income tax withholding. If you decide to change your withholding the withholding calculator, can help you determine if you need to adjust your withholding and submit a new, pre-filled Form W-4, Employee’s Withholding Allowance Certificate, to submit to your employer.

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Sign in to your IRS Account to:

  • Make payments
  • Go paperless for certain notices
  • Get email notifications for new notices

General Resources

Understanding your notice or letter

Get Help topics

Browse common tax issues and situations at TAS Get Help

If you still need help

The Taxpayer Advocate Service is an independent organization within the IRS. TAS helps taxpayers resolve problems with the IRS, makes administrative and legislative recommendations to prevent or correct the problems, and protects taxpayer rights. TAS helps all taxpayers (and their representatives), including individuals, businesses, and exempt organizations. You may be eligible for free TAS help if your IRS problem is causing financial difficulty, if you’ve tried and been unable to resolve your issue with the IRS, or if you believe an IRS system, process, or procedure just isn’t working as it should.

TAS has offices in every state, the District of Columbia, and Puerto Rico. To find your local advocate’s number:

Low Income Taxpayer Clinics (LITCs) assist individuals whose income is below a certain level who need to resolve tax problems with the IRS. They also provide education, outreach, and information on taxpayer rights to individuals who speak English as a second language. LITCs represent taxpayers in disputes before the IRS and courts and help taxpayers respond to IRS notices and correct account problems. Services are offered for free or a small fee. LITCs are independent from the IRS and TAS. For more information or to find an LITC near you, see the LITC Page or Publication 4134, Low Income Taxpayer Clinic List. You can also request Pub. 4134 by calling 800-TAX-FORM (800-829-3676).

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Let us help you navigate your way through the IRS. Visit our interactive tax map to see where you are in the tax process.

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Did you know there is a Taxpayer Bill of Rights?

The taxpayer Bill of Rights is grouped into 10 easy to understand categories outlining the taxpayer rights and protections embedded in the tax code.

It is also what guides the advocacy work we do for taxpayers.

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