IRS Summons — Complete Practitioner Guide
How to respond to IRS summonses — IRC §7602 authority, third-party summonses, John Doe summonses, summons enforcement, and practitioner-client privilege protections. Updated for 2026.
IRS Summons Authority Under IRC §7602
The IRS has broad authority to summon books, records, papers, and testimony under IRC §7602. A summons can be issued to the taxpayer directly, to third parties (banks, employers, business partners), or to unknown persons through a "John Doe" summons. The IRS can use summons authority during an examination, collection investigation, or criminal investigation.
| Summons Type | Issued To | Notice Required | Taxpayer Rights |
|---|---|---|---|
| Direct summons | Taxpayer | No advance notice | Can challenge by refusing to comply; IRS must seek enforcement |
| Third-party summons | Third party (bank, employer) | Notice to taxpayer required | Can petition to quash within 20 days |
| John Doe summons | Unknown persons (e.g., financial institution) | Court approval required | No advance notice to affected persons |
| Third-party recordkeeper summons | Banks, brokers, accountants | Notice to taxpayer required | Can petition to quash within 20 days |
Source: IRC §7602-7613
Responding to a summons: When a taxpayer receives a summons, they have several options: (1) comply fully; (2) comply partially (provide some documents, object to others); (3) refuse to comply and force the IRS to seek enforcement in federal district court; or (4) petition to quash a third-party summons within 20 days. The appropriate response depends on the nature of the summons, the documents requested, and the taxpayer's exposure.
Challenging an IRS Summons
A taxpayer can challenge an IRS summons on several grounds: (1) the summons was issued for an improper purpose (e.g., to harass the taxpayer); (2) the information sought is protected by attorney-client privilege or work product doctrine; (3) the summons is overbroad or unduly burdensome; (4) the IRS already has the information requested; or (5) the summons was not properly served.
The Powell test: To enforce a summons, the IRS must establish four elements under United States v. Powell, 379 U.S. 48 (1964): (1) the investigation is being conducted for a legitimate purpose; (2) the information sought may be relevant to that purpose; (3) the information is not already in the IRS's possession; and (4) the administrative steps required by the IRC have been followed. If the IRS cannot establish all four elements, the summons will not be enforced.
Privilege protections: Documents protected by attorney-client privilege or work product doctrine are not subject to IRS summons. However, the privilege must be properly asserted — the taxpayer must provide a privilege log identifying each withheld document and the basis for the privilege claim. Blanket assertions of privilege without a privilege log are generally rejected by courts.
Third-Party Summonses — Protecting Client Interests
When the IRS issues a summons to a third party (bank, employer, accountant), the taxpayer has the right to receive notice and petition to quash the summons within 20 days. This is a critical right that practitioners must be alert to — missing the 20-day deadline forfeits the right to challenge the summons.
When to petition to quash: Practitioners should consider petitioning to quash a third-party summons when: (1) the documents sought are protected by privilege; (2) the summons is overbroad and seeks documents beyond the scope of the examination; (3) the summons was issued for an improper purpose; or (4) compliance with the summons would reveal information that could significantly harm the taxpayer's position in the examination.
John Doe summonses: A John Doe summons is issued to a financial institution or other entity to identify unknown taxpayers who may have unreported income or assets. Famous examples include IRS summonses to Swiss banks (UBS, Credit Suisse) to identify U.S. taxpayers with undisclosed foreign accounts, and summonses to cryptocurrency exchanges (Coinbase, Kraken) to identify taxpayers with unreported cryptocurrency gains. Taxpayers who receive notice that their information may have been disclosed through a John Doe summons should immediately consult with a tax attorney about voluntary disclosure options.
Frequently Asked Questions
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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