18 U.S.C. § 371 creates two conspiracy offenses: (1) conspiracy to commit any federal offense, and (2) conspiracy to defraud the United States — including the IRS in revenue collection. Both carry up to 5 years imprisonment. The defraud clause ("Klein conspiracy") is broader and easier to prove than substantive tax charges.
Most multi-defendant tax cases are charged primarily as § 371 conspiracies. The defraud-the-United-States variant — Klein conspiracy — does not require proving any specific tax violation. The government need only prove a conspiracy to impede the lawful function of the IRS. This makes Klein conspiracy a powerful tool — and a frequent stretching of conspiracy doctrine.
The Two Variants of § 371
Offense Conspiracy
Conspiracy to commit any specific federal offense — wire fraud, false return, evasion. Government must prove the underlying offense was the object.
Klein Conspiracy (Defraud-the-United-States)
Conspiracy to defraud the United States — to impede the lawful function of any federal agency. United States v. Klein, 247 F.2d 908 (2d Cir. 1957) defined this in the IRS context as conspiring "to interfere with or obstruct one of [the IRS's] lawful governmental functions by deceit, craft, or trickery, or at least by means that are dishonest."
The Klein clause does not require any specific tax violation as the object — only an agreement to impede the IRS through dishonesty.
Elements
The government must prove:
- An agreement between two or more persons;
- An unlawful object — to commit a federal offense (offense conspiracy) or to defraud the United States (Klein);
- Knowing participation — the defendant joined the agreement knowing its purpose;
- An overt act in furtherance of the conspiracy by any conspirator.
The overt act requirement is minimal — sending a single email, making a single deposit, signing a single document can satisfy it. The agreement does not need to be express; circumstantial evidence routinely supports inference of agreement.
Why Prosecutors Love § 371
- Lower evidentiary bar than substantive offenses — the government does not need to prove a completed violation, only an agreement to commit one;
- Co-conspirator statements are admissible against all conspirators (Federal Rule of Evidence 801(d)(2)(E));
- Pinkerton liability — every conspirator is responsible for foreseeable acts of co-conspirators (Pinkerton v. United States, 328 U.S. 640 (1946));
- Statute of limitations — runs from the last overt act, often years after underlying acts;
- Multiple objects — a single conspiracy can encompass multiple object offenses, increasing charging flexibility.
Common Charging Patterns
Tax Shelter Promoters
Promoters of abusive tax shelters charged with conspiracy alongside CPAs, attorneys, and clients. Klein conspiracy reaches the entire web of participants.
Off-Books Payroll Schemes
Owner, bookkeeper, and payroll provider charged with conspiracy to evade employment taxes plus substantive § 7202 counts.
Refund Fraud Rings
Multi-state refund fraud rings using stolen identities — charged as conspiracy to commit wire fraud and identity theft, plus tax-related Klein counts.
Family Tax Schemes
Spouse-on-spouse and parent-child conspiracy charges in family business tax cases.
Defenses
No Agreement
The strongest defense. The government must prove a meeting of the minds — not parallel conduct, not after-the-fact knowledge.
Withdrawal
A conspirator who withdrew before the conspiracy ended can escape liability for subsequent acts. Withdrawal requires affirmative steps — silence is not enough.
Buyer-Seller Defense
A simple business transaction, even with knowledge of the buyer's purpose, is not conspiracy. The defense applies where defendant merely sold services without joining the criminal enterprise.
Statute of Limitations
5 years from the last overt act under 18 U.S.C. § 3282 — but tax-related conspiracy charges often invoke 6-year limitations periods from related substantive offenses.
Sentencing Implications
Conspiracy convictions typically receive the same Guidelines treatment as the substantive offense (USSG § 2X1.1). For tax conspiracy, this means USSG § 2T1.1 governs and tax loss drives offense level.
However, conspiracy-specific factors include:
- Role enhancement for organizers (+2 to +4);
- Role reduction for minor participants (-2 to -4);
- Acceptance of responsibility — typically requires waiving conspiracy-only defenses;
- Cooperation under USSG § 5K1.1 — often results in substantial sentence reductions when defendant flips on co-conspirators.
What to Do If You Are Under Investigation or Charged
- Do not speak with IRS Criminal Investigation (CI) agents without an attorney — even informally. Special agents are not auditors; they investigate crimes.
- Do not destroy or alter records — destruction can become obstruction under 18 U.S.C. § 1519 with a 20-year maximum.
- Locate and preserve all bank records, returns, ledgers, emails, and accountant correspondence.
- Discontinue the conduct — but do not amend returns or take corrective action without counsel; both can be used against you.
- Engage federal tax defense counsel immediately — call L and L Law Group at (214) 466-1398, available 24/7.
Frequently Asked Questions
What is a Klein conspiracy?
Conspiracy to defraud the United States by impeding the lawful function of the IRS through deceit, craft, or trickery. Named after United States v. Klein. Does not require proving any specific tax offense.
Can I be charged with conspiracy if I never met some of the other defendants?
Yes. Conspiracy law requires only an agreement, not personal acquaintance. Hub-and-spoke conspiracies — where multiple actors coordinate through a central figure without knowing each other — are common.
How do I withdraw from a conspiracy?
Affirmative withdrawal requires concrete steps to disassociate — informing co-conspirators, ceasing participation, sometimes reporting to authorities. Mere silence or non-participation is not enough.
What is Pinkerton liability?
A doctrine making each conspirator liable for foreseeable substantive offenses committed by co-conspirators in furtherance of the conspiracy. Named after Pinkerton v. United States, 328 U.S. 640 (1946).
Is conspiracy the same sentence as the underlying offense?
Often, but not always. § 371 caps conspiracy at 5 years even when the underlying offense (e.g., bank fraud) carries 30. But Sentencing Guidelines apply the underlying offense's loss table.
Speak With a Frisco Criminal Defense Attorney
If you or a loved one is facing federal tax crimes charges in Frisco, Collin County, or anywhere in the Dallas-Fort Worth metroplex, the time to act is now. L and L Law Group attorneys are available 24 hours a day, 7 days a week. Call (214) 466-1398 for a free, confidential consultation, or submit your case online and a licensed attorney will contact you directly.
This article is general information, not legal advice. Texas and federal criminal law are complex and fact-specific — please consult a licensed attorney about your particular situation. Past results do not guarantee future outcomes.