No. 19-930October Term 2019Decided May 17, 2021Updated Sep 3, 2026
CIC Servs. v. IRS
CIC Servs., LLC v. IRS
The Anti-Injunction Act does not prevent a lawsuit challenging an IRS reporting rule merely because noncompliance can trigger a tax penalty.
Case status
Decided 9-0 · May 17, 2021 · Opinion by Justice Kagan
Read the opinion (PDF)- Current stage
- Decided
- Latest event
- Decision released May 17, 2021
- What it's about
In a unanimous decision, the Supreme Court ruled that the Anti-Injunction Act does not prevent lawsuits challenging IRS regulatory mandates, such as reporting requirements, even if failing to comply results in a tax penalty. The Court determined that a suit contesting the legality of a regulation is not the same as a suit seeking to stop the collection of a tax.
Question presented
Whether the Anti-Injunction Act’s bar on lawsuits “for the purpose of restraining the assessment or collection of any tax,” 26 U.S.C. § 7421(a), precludes challenges to IRS reporting requirements backed by tax penalties.
- Case path
United States Court of Appeals for the Sixth Circuit / Decision released May 17, 2021
- Area
Business and Regulation
Decision
What the Court decided
The Anti-Injunction Act does not prevent a lawsuit challenging an IRS reporting rule merely because noncompliance can trigger a tax penalty.
Impact
Businesses and other taxpayers can challenge IRS reporting mandates without first violating the rule and paying a penalty. For example, a company facing a reporting requirement may bring a lawsuit over the rule itself.
Not official Court text.
Vote
- Vote split
- 9-0
- Majority author
- Elena Kagan
Majority
- Elena Kagan(author)
- John G. Roberts, Jr.
- Clarence Thomas
- Stephen G. Breyer
- Samuel A. Alito, Jr.
- Neil Gorsuch
- Amy Coney Barrett
- Sonia Sotomayor(concurring, author)
- Brett M. Kavanaugh(concurring, author)
Opinion documents
Briefing
What it's about
The Supreme Court unanimously decided that the Anti-Injunction Act does not block lawsuits challenging IRS reporting requirements backed by tax penalties. It said challenging a regulation is different from seeking to stop tax collection.
Vote
Impact
Businesses and other taxpayers can challenge IRS reporting mandates without first violating the rule and paying a penalty. For example, a company facing a reporting requirement may bring a lawsuit over the rule itself.
What's next
The Court has finished its action in this case. Taxpayers challenging similar IRS regulatory mandates may seek to bring their claims without first paying a related penalty.
What did the Supreme Court rule in CIC Services v. IRS?
The Court said the Anti-Injunction Act does not bar lawsuits challenging IRS reporting requirements backed by tax penalties.
Who is affected by the CIC Services decision?
Businesses and taxpayers subject to IRS reporting mandates may challenge those rules without first violating them and paying a penalty.
What happens next in CIC Services v. IRS?
The Supreme Court has completed the case. Similar challenges to IRS regulatory requirements can proceed under the Court's interpretation.
Timing
Decided May 17, 2021
The Court released its decision on May 17, 2021 without hearing oral argument.
Documents
Activity
Docket activity5
AI analysis generated: Case Briefing
Sep 3, 2026 | Generated
Brief added: Questions Presented
Mar 8, 2026 | Court records
Opinion added: opinion
May 17, 2021 | Court records
Brief added: Petition
Jan 17, 2020 | Court records
Court Order added: Lower Court Orders/Opinions
Oct 21, 2019 | Court records
Related cases




Grounding
- Grounding
- Primary materials plus reporting.
- Note
- Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.
- Checked
- Sep 3, 2026
- Method
- Methodology
Primary materials11
Supreme Court docket 19-930
docket | Jul 25, 2026
Primary case document
Supreme Court document | Jul 25, 2026
CourtListener docket record
docket | Jul 25, 2026
Questions Presented
brief | Mar 8, 2026
Opinion
opinion | May 17, 2021
Petition
brief | Jan 17, 2020
Lower Court Orders/Opinions
order | Oct 21, 2019
SupremeCourt.gov
official | Sep 3, 2026
SupremeCourt.gov
official | Sep 3, 2026
SupremeCourt.gov
official | Sep 3, 2026
SupremeCourt.gov
official | Sep 3, 2026