An IRS investigation is already daunting, but it can turn downright humiliating when third parties become involved. Can the IRS really contact banks, employees, vendors, business partners, and even friends or neighbors to investigate its case?

In short, yes. Federal law generally requires the IRS to warn you before it does this, but there are important exceptions where third‑party contact can occur without your knowledge.

When an IRS Investigation Involves Others

A third‑party contact happens when an IRS employee reaches out to someone other than the taxpayer and asks questions about that specific taxpayer’s federal tax liability, including by issuing a summons or a levy. That can include banks, employers, contractors, customers, vendors, and in some situations personal acquaintances who may know about your finances or have witnessed certain details of your business or living arrangements.

The IRS can even access or review the bank accounts of your close contacts if they believe the information they find might aid in the collection of your outstanding taxes. We covered that potential aspect previously.

Routine database searches, contacts with other government agencies, and discussions with your own employees acting within the scope of their jobs are fair game and don’t require notification. But if an agent calls your neighbor or business associate to verify where you live, who you work with, or how you get paid, that is generally treated as a third‑party contact covered by the notice rules.

How Could I Be Notified About an IRS Investigation?

An IRS investigation that requires conversations with outsiders can damage a taxpayer’s reputation and strain business relationships. Yet, for years, the IRS casually relied on the generic, often-overlooked language in Publication 1 (“Your Rights as a Taxpayer”) as its third‑party contact notice. Publication 1 states that the IRS may sometimes contact other people, such as a neighbor, bank, or employer, if it needs information you have not provided. 

But courts and Congress have since concluded that this boilerplate does not give taxpayers useful information or a real chance to respond before their contacts are pulled into an examination. So, in 2019, the Taxpayer First Act was passed, which requires advance notice before most third‑party contacts. The IRS must give a more specific written notice that it intends to contact third parties, specify the tax periods involved, and state the time window—no longer than one year—during which those contacts may occur. That notice must be sent at least 45 days before the first third‑party contact.

This notice is typically sent using a version of Letter 3164, “Third Party Contact” notice. In many IRS investigations and collections, the letter arrives early in the case, offering an opportunity to supply missing records directly and potentially avoid outside contacts for those who cooperate fully.

When the IRS Can Skip Notice

Several important exceptions exist where an IRS investigation could involve contacting someone about your taxes without your prior knowledge. These include:

• Reprisal risk: If the IRS has good cause to believe that giving notice might lead you to retaliate—physically, economically, or emotionally—against the person providing information, it can withhold both advance notice and the third party’s name from any list you later request.
• Jeopardy to collection: If the IRS believes notice could jeopardize its ability to collect the tax—for example, by giving you time to hide or dissipate assets—it may proceed without advance notice and delay recording the contact.
• Criminal investigations: Contacts made in connection with a pending criminal investigation are exempt from the notice requirement.
• Your authorization: If you sign a specific authorization (Form 12180) allowing the IRS to speak with named third parties, the IRS does not have to send a separate notice or record those particular contacts.

The bottom line is that, in sensitive cases, the IRS can quietly talk to employers, lenders, or others if it believes warning you would create risk or undercut enforcement.

What You Can Do If You Are Under IRS Scrutiny

If you receive a Letter 3164 or other third‑party contact notice, assume the IRS investigation will include people and institutions in your financial life unless you promptly bridge the information gap. You have the right to request a list of third‑party contacts the IRS has made during your case (with limited exceptions for reprisal and criminal matters), and doing so can help you understand how far the inquiry has spread.

The most effective step during such an IRS investigation is proactive: Work with a qualified tax professional, and potentially a legal representative, to gather and provide requested records quickly so the IRS has less reason to look elsewhere. If you believe the IRS contacted third parties without proper notice, your representatives can evaluate whether your rights were violated, raise the issue with the IRS, and, in some circumstances, challenge improper summonses.

Feel free to contact us with questions. 

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