1. Introduction – What is Publication 4518?
IRS Publication 4518, titled What You Can Expect When the IRS Assigns Your Account to a Private Collection Agency, is an official document published by the Internal Revenue Service. It acts as an essential consumer guide for taxpayers whose overdue tax accounts are transferred from regular IRS inventory to authorized third-party debt collection contractors. The document explains how private collectors operate, outlines the identity verification steps required by law, and informs taxpayers about their legal rights.
In 2026, the IRS updated operational guidelines for its Private Debt Collection program, including refreshed Notice CP40 procedures in February 2026 and revised collection enforcement standards in July 2026. The IRS continues to validate Publication 4518 as the core informational booklet enclosed with official notices. These 2026 updates reaffirm the agency’s commitment to protecting taxpayers against aggressive collection practices and phone scams.
2. Who Should Read This Publication
Publication 4518 is vital for any taxpayer who has an outstanding tax balance that has remained unpaid for several years. When the IRS does not actively pursue an older balance due to resource constraints, the account may be designated as an inactive receivable and handed to an outside agency.
You should review this publication if you find yourself in any of the following situations:
- You recently received an official IRS Notice CP40 in the mail stating that your account has been assigned to a private contractor.
- You have received a phone call or written notice from a third-party debt collector claiming to represent the IRS.
- You are a tax practitioner, CPA, or enrolled agent helping clients resolve historic tax delinquencies.
- You are concerned about telephone scams and want to know how legitimate private collection contractors verify their identity.
3. Key Topics Covered
Publication 4518 breaks down the entire private debt collection process into clear, easy-to-understand rules. It addresses common worries taxpayers have when an outside company contacts them about government debt.
The primary topics covered within the publication include:
- The congressional mandate under the FAST Act requiring the IRS to contract with private collection agencies.
- The mandatory two-letter notification system that occurs before any phone call takes place.
- The identity verification process using a unique Taxpayer Authentication Number.
- The exact roster of private agencies authorized to collect debts on behalf of the IRS.
- Allowed payment methods and the absolute prohibition on paying private agencies directly.
- Taxpayer protections under the Fair Debt Collection Practices Act.
4. Detailed Breakdown of Main Concepts
The Two-Letter Notification Rule
The IRS will never transfer your account to a private collection agency without prior written notice. First, the IRS sends you a formal Notice CP40 along with a copy of Publication 4518. Shortly after, the assigned collection agency sends its own welcome letter confirming the transfer.
Both letters contain your name, address, and an identical ten-digit Taxpayer Authentication Number. If you receive a phone call before receiving these physical letters, do not provide any personal financial details.
Identity Verification and Two-Party Authentication
To guard against identity theft and scammers, the IRS requires a two-way authentication process during any telephone contact. When an agent calls, they must confirm parts of your authentication number from your letter, and you will confirm matching portions from yours. This two-way check ensures both you and the agency know you are speaking with legitimate parties.
Limitations on Private Collection Agencies
Private debt collectors do not possess the statutory enforcement powers of IRS revenue officers. They cannot take enforcement actions such as issuing bank levies, placing federal tax liens, garnishing wages, or threatening criminal arrest. Their role is strictly limited to contacting you, explaining your payment options, and helping you set up a voluntary payment arrangement.
Payment Procedures: Always Pay the IRS Directly
A crucial rule highlighted in Publication 4518 is that private collection agencies can never accept payment directly. You should never make a check payable to the agency or send payments to their corporate offices. All checks must be made payable to the United States Treasury, and electronic payments must be submitted through IRS electronic portals or authorized Treasury processors.
| Action | Private Collection Agency | Internal Revenue Service (IRS) |
|---|---|---|
| Set up voluntary monthly payment plans | Yes | Yes |
| Issue bank account levies or wage garnishments | No | Yes |
| File a Notice of Federal Tax Lien | No | Yes |
| Accept direct payments in the agency’s name | No (Never) | Yes (Payable to US Treasury) |
| Must follow Fair Debt Collection Practices Act | Yes | Subject to Internal Revenue Code |
5. Practical Examples or Scenarios
Scenario 1: Resolving an Older Balance via a Payment Agreement
Marcus owed $4,200 from a tax return filed four years ago. After years of inactivity, he receives Notice CP40 and Publication 4518, followed by a letter from an approved private collection agency. When the agency calls, Marcus uses the Taxpayer Authentication Number from both letters to verify the caller. Marcus explains that he cannot pay the full balance immediately, so the representative assists him in establishing an electronic installment agreement paid directly to the IRS.
Scenario 2: Spotting an Aggressive Imposter Scam
Linda receives a cold call from someone claiming to represent an IRS collection service. The caller threatens immediate arrest and insists Linda purchase prepaid debit cards within two hours to settle the debt. Because Linda reviewed Publication 4518, she recognizes the red flags: she never received Notice CP40, the caller demanded payment via gift card, and no authentication number was exchanged. Linda hangs up and reports the scam call to the authorities.
6. How This Publication Relates to Specific Forms
Publication 4518 does not operate in isolation; it interacts with several critical tax forms and official communications:
- Notice CP40: The official IRS notice sent to notify you that your overdue account has been assigned to a private debt collector. Publication 4518 is packaged directly with this notice.
- Form 1040: The individual tax return from which the underlying unpaid tax assessment originated.
- Form 9465 (Installment Agreement Request): Used by taxpayers wishing to propose a monthly payment plan if they cannot pay their balance in full.
- Form 8821 and Form 2848: Tax Information Authorization and Power of Attorney forms. If you have an authorized representative on file, they will also receive a copy of your assignment notices.
7. Common Misunderstandings Clarified
Misunderstanding 1: Private collectors can take your house or seize your salary
This is completely false. Private collection contractors have no authority to initiate legal action, revoke passports, or levy assets. Only the IRS has the legal authority to execute enforced collection actions.
Misunderstanding 2: You must write a check out to the collection agency
Private agencies never collect money under their own company names. Any legitimate representative will direct you to pay through official government channels, such as IRS Direct Pay, the Electronic Federal Tax Payment System, or by check payable to the United States Treasury.
Misunderstanding 3: You are required to work with the private agency
If you prefer not to work with a private contractor, you have the right to request in writing that your account be sent back to the IRS. Once the private agency receives your written request, they must cease contacting you and return your file to the IRS.
8. Why This Publication Matters for Taxpayers
Facing unpaid taxes is stressful, and receiving a communication from a collection agency often creates fear and confusion. Publication 4518 gives taxpayers peace of mind by explaining the exact boundaries and rules governing private debt collectors. It eliminates ambiguity, clearly defines what collectors can and cannot do, and equips taxpayers with the knowledge needed to avoid financial scams.
By understanding this document, you maintain complete control over your tax account, protect your personal financial data, and navigate the resolution process with confidence.
9. Frequently Asked Questions
Which private collection agencies work for the IRS?
The IRS maintains contracts with designated private firms, which historically include CBE Group, Coast Professional, and ConServe. The specific list of approved contractors is published on the official IRS website, and you will only ever be assigned to one firm at a time.
Can a private collection agency offer an Offer in Compromise?
No. Private collection agencies cannot negotiate settlements or accept an Offer in Compromise to reduce the tax amount owed. If you wish to settle for less than the full amount due to financial hardship, you must submit that request directly to the IRS.
What hours are collection agency employees allowed to call?
Under the Fair Debt Collection Practices Act, private collectors may only contact you between 8:00 AM and 9:00 PM local time. They cannot call you at unusual hours or contact you at work if you inform them your employer prohibits such calls.
What should I do if a private collector is rude or abusive?
Contractors are legally required to treat taxpayers with respect and courtesy. If an agent uses abusive language or makes improper threats, note their name and badge number, and report the behavior immediately to the Treasury Inspector General for Tax Administration.
10. Conclusion
IRS Publication 4518 is an essential safety shield for taxpayers dealing with historic tax debt. Receiving a Notice CP40 does not mean you have lost your rights or that enforcement agents are knocking on your door. By reviewing Publication 4518, confirming your Taxpayer Authentication Number, and keeping all payments strictly payable to the United States Treasury, you can resolve your balance smoothly and securely.
