If you are under federal investigation for fraud—or if you have received a target letter, a grand jury subpoena, or an unexpected visit from federal agents—prosecutors may eventually invite you to participate in a “proffer session.” For many defendants facing federal charges, a proffer agreement represents one of the most consequential decisions of the entire case. The right choice, made at the right time and with the right preparation, can narrow charges, reduce sentencing exposure, or even avoid prosecution entirely. The wrong choice—or the right choice made without full preparation—can add new felony counts, expand the government’s evidence, and lock you into positions that are difficult to walk back.
This guide explains what a proffer agreement is, how it works in federal fraud investigations in New York City and on Long Island, and what every defendant should understand before signing one.
What Is a “Proffer Agreement”?
A proffer agreement—also called a “proffer letter,” “Queen for a Day” letter, or cooperation proffer—is a written contract between a federal prosecutor and a defendant or prospective witness that allows the person to share information about potential crimes in exchange for limited protections on how those statements may be used. The DOJ Justice Manual and federal practice generally describe these agreements as standard cooperation tools in complex investigations. The term “Queen for a Day” reflects the temporary protection offered: for the duration of the session, the participant speaks relatively freely, but the agreement does not grant permanent immunity from prosecution.
Proffer agreements are especially common in federal fraud, conspiracy, and complex white-collar investigations where insider information is crucial to building the government’s case. They are one of the Department of Justice’s standard cooperation tools, and understanding their structure—and their limits—is essential for anyone navigating a federal investigation in the New York area.
Federal Fraud Investigations in New York City and Long Island
The Key Federal Enforcement Players
Two federal districts cover the New York metropolitan area and Long Island, and each runs a high volume of complex fraud prosecutions:
- The U.S. Attorney’s Office for the Southern District of New York (SDNY) covers Manhattan, the Bronx, Westchester, Rockland, Putnam, Orange, Dutchess, and Sullivan Counties. It is widely regarded as one of the most active federal prosecutors’ offices in the country for securities fraud, wire fraud, bank fraud, and organized financial crime.
- The U.S. Attorney’s Office for the Eastern District of New York (EDNY) covers Brooklyn, Queens, Staten Island, Nassau County, and Suffolk County. It handles a substantial caseload of health care fraud, mortgage fraud, and organized financial schemes affecting Long Island communities.
Both offices work closely with federal investigative agencies including the FBI’s white-collar crime program, the IRS Criminal Investigation division (IRS-CI), the Department of Health and Human Services Office of Inspector General (HHS-OIG), and the Secret Service. These agencies investigate fraud schemes collaboratively and often share information gathered through proffer sessions.
Types of Federal Fraud Cases Where Proffers Are Common
Proffer agreements surface across a broad range of federal fraud matters, including:
- Wire fraud and mail fraud involving investment schemes, online scams, or business-to-business fraud schemes that cross state lines.
- Bank fraud and mortgage fraud, credit card fraud, and PPP or COVID-relief loan fraud.
- Health care fraud involving billing schemes, kickbacks, or upcoding, often resolved through large coordinated enforcement actions.
- Securities fraud involving insider trading, market manipulation, or material misrepresentations to investors.
- Insurance fraud and related schemes involving false claims or fraudulent documentation.
In any multi-defendant fraud scheme, the government’s ability to prosecute higher-level organizers depends heavily on testimony from lower-level participants. This is exactly what makes proffer sessions so valuable to federal prosecutors—and what makes them so delicate for defendants.
The Role of Cooperation in Federal Cases
DOJ policy has for years emphasized the importance of individual cooperation and “cooperation credit” in resolving investigations, including in corporate fraud matters. Prosecutors use proffer sessions as one of their primary tools for evaluating whether a person is genuinely cooperating and whether leniency is warranted. Understanding this dynamic is critical before you walk into any meeting with federal agents.
The Legal Foundation of Proffer Agreements
Federal Rule of Evidence 410
Federal Rule of Evidence 410 provides baseline protection for statements made during plea negotiations. The rule generally makes such statements inadmissible against the defendant who made them, subject to limited exceptions. The purpose of Rule 410 is to encourage candor in plea discussions by assuring defendants that their words cannot be used against them at trial if negotiations break down.
This protection, however, is not automatic once you sign a proffer agreement—and that distinction is one of the most important things to understand.
Waivers of Rule 410 in Modern Proffer Letters
Many federal proffer agreements require the defendant to expressly waive Rule 410 protections. Once that waiver is signed, the government may use the defendant’s statements to impeach them at trial if they testify inconsistently, or to rebut arguments raised by the defense. Courts in multiple circuits have repeatedly upheld these waivers as enforceable, meaning a defendant who signs a proffer letter and then takes the stand telling a different story can expect the government to introduce their prior statements directly.
The practical consequence: a proffer agreement does not provide the protection that many defendants assume. It is a limited, conditional protection with substantial built-in exceptions.
18 U.S.C. § 1001 and the Risk of False Statements
One of the gravest legal risks of any proffer session is 18 U.S.C. § 1001, which makes it a federal felony to knowingly and willfully make materially false, fictitious, or fraudulent statements in any matter within federal jurisdiction. As the Department of Justice’s Criminal Resource Manual makes clear, this statute applies broadly to statements made to federal investigators and prosecutors—including during proffer sessions.
A defendant who lies, omits material facts, or provides misleading information during a proffer can face separate § 1001 charges layered on top of the underlying fraud counts. This significantly increases total sentencing exposure and signals to the court that the defendant is not a trustworthy cooperator.
Cooperation and Sentencing: U.S.S.G. § 5K1.1
If prosecutors determine that a defendant’s cooperation constitutes “substantial assistance” in the investigation or prosecution of another person, they may file a motion under U.S. Sentencing Guidelines § 5K1.1 recommending a below-guidelines sentence. This motion effectively unlocks the sentencing judge’s ability to depart significantly downward from what the guidelines would otherwise require.
It is important to understand, however, that a 5K1.1 motion is not automatic—it is entirely within the prosecutor’s discretion, and it is not guaranteed by any proffer agreement. In complex fraud matters, the period between an initial proffer session and sentencing can span many months or over a year, as cooperation continues through grand jury testimony, follow-up debriefings, and potentially trial testimony. For a broader look at how federal sentencing works in fraud cases, see our article on federal sentencing guidelines for fraud offenses in New York.
What a Federal Proffer Agreement Actually Does
Basic Structure of a Proffer Letter
A federal proffer letter is typically a multi-page letter from the U.S. Attorney’s Office that sets out:
- The date and scope of the proffer session.
- The government’s promises about how it will (and will not) use the statements provided.
- The defendant’s obligations, most importantly the duty to be truthful and to make complete disclosures.
These letters are not standardized by statute; they vary by district, component, and individual AUSA. The SDNY and EDNY have their own common formats, and experienced defense counsel will be familiar with how each office structures its proffer letters.
What the Government Promises—and What It Doesn’t
A typical proffer agreement includes promises that:
- The government will not use the defendant’s statements directly as part of its case-in-chief at trial.
- The protections apply to the specific session covered by the letter; statements made outside the proffer—in other conversations with agents or prosecutors—are generally not covered.
These are meaningful but narrow protections. They limit direct use of the statements in the government’s affirmative case. They do not prohibit the government from using the information in a wide range of other ways.
The Government’s Reserved Rights
Most proffer agreements expressly preserve the government’s right to use the defendant’s statements in several circumstances:
- To impeach: If the defendant testifies at trial or in any other proceeding and makes statements inconsistent with what they said in the proffer, prosecutors can introduce the proffer statements to impeach them.
- To rebut: In some districts, proffer statements can be used to rebut specific defenses or arguments raised at trial, even without direct contradiction.
- For derivative use: The government can use information from the proffer to obtain other evidence—subpoenas to banks or employers, search warrants for emails and records, identification of additional witnesses. This derivative evidence can typically be introduced at trial freely.
- At sentencing: Many proffer letters allow the government to use statements at sentencing if the defendant breaches the agreement or if the letter explicitly permits sentencing use.
Why a Proffer Agreement Is Not Immunity
It is critical to distinguish a proffer agreement from formal statutory immunity. Under the Supreme Court’s decision in Kastigar v. United States, 406 U.S. 441 (1972), compelled testimony under a grant of immunity protects the witness against both direct use and derivative use of their statements. A proffer agreement does neither. It is a contract, not a grant of immunity, and it expressly permits derivative use in virtually every version used by federal prosecutors today. Defendants who enter a proffer session believing they have immunity-like protection are badly misinformed about the legal reality.
The Proffer Process in a Federal Fraud Case
How a Proffer Comes Up
Proffer sessions typically arise in one of two ways:
- The AUSA invites a target, subject, or witness—through defense counsel—to provide information about a fraud scheme. This often occurs after a grand jury subpoena has been served or after an arrest.
- Defense counsel proactively requests a proffer on behalf of a client who believes cooperation may be in their interest, particularly when the government’s evidence appears strong.
In SDNY and EDNY fraud investigations, it is common for prosecutors to expect an initial “attorney proffer” before any in-person session—meaning defense counsel outlines what the client can offer, allowing the government to evaluate whether a full session is worthwhile.
Pre-Proffer Assessment
Before any proffer agreement is signed, defense counsel should conduct a thorough pre-proffer assessment. This means reviewing all available discovery—complaint affidavits, search warrant materials, subpoenas, and any other materials obtained by the defense—and comparing what the government likely already knows with what the client can realistically add. If the client’s information does not substantially advance the government’s investigation, the risks of proffering may outweigh any potential benefits.
To understand how federal investigations unfold before a proffer is even offered, see our guide on the federal white-collar crime investigation process in New York.
The Proffer Session Itself
In person, a proffer session typically involves the AUSA, case agents (commonly from the FBI, IRS-CI, or HHS-OIG), defense counsel, and the client. The client answers detailed questions about:
- Their own conduct in the alleged scheme.
- Other participants, entities, and co-conspirators.
- Specific documents, bank accounts, communications, and transactions relevant to the fraud.
The client is expected to be completely truthful. Partial, evasive, or intentionally misleading answers can be treated as violations of the agreement and may expose the client to § 1001 charges. Good preparation is not just advisable—it is essential.
After the Proffer
Following the session, prosecutors and agents verify the information provided: reviewing documents, interviewing witnesses, and potentially executing search warrants or subpoenas based on leads from the proffer. The government then decides whether to:
- Move toward a formal cooperation agreement with the expectation of a plea and ongoing cooperation.
- Use the information and its derivative leads without extending any plea offer.
- Decline to prosecute based on the value of cooperation (comparatively rare).
In complex fraud cases—particularly those involving multiple defendants or large financial schemes—follow-up debriefings, grand jury testimony, and trial testimony may all be required as part of sustained cooperation.
Benefits of Proffering in a Federal Fraud Case
Potential to Reduce Charges or Avoid Indictment
Early, substantial cooperation can sometimes persuade prosecutors not to pursue certain charges, to include fewer counts in an indictment, or to charge a lesser offense. In cases involving multiple participants, a lower-level participant who provides genuinely valuable information may be treated primarily as a cooperating witness rather than a primary defendant. This can be a significant benefit when the alternative is a multi-count indictment carrying substantial mandatory sentencing exposure. For more background on what an indictment means and what happens after charges are brought, see our articles on what an indictment means for jail exposure in New York and whether federal charges can be dropped after indictment.
Sentencing Benefits and 5K1.1 Motions
Meaningful cooperation can result in a § 5K1.1 motion allowing the sentencing court to depart downward from the applicable guidelines range. In SDNY and EDNY cases involving large fraud schemes, the difference between a guidelines sentence and a post-5K1.1 departure can be measured in years, not months. Judges in both districts take cooperation seriously, but they retain full discretion to determine how much weight any government recommendation receives.
Strategic Advantages in Multi-Defendant Cases
In cases involving multiple co-defendants, proffering can help clarify a client’s relative culpability, demonstrate acceptance of responsibility at an early stage, and protect the client from being portrayed as the most culpable actor when others in the scheme may bear greater responsibility. A client who demonstrates credible cooperation early can sometimes shape how the government—and ultimately the court—views their role in the overall scheme.
Risks and Hidden Dangers of Proffer Agreements
Waiver of Evidence Protections
By signing a proffer agreement that includes a Rule 410 waiver, a defendant gives up a meaningful evidentiary protection. In practice, courts have allowed the government to introduce proffer statements when a defendant “opens the door” to a topic at trial—sometimes even when the proffer statements do not directly contradict trial testimony. The standard for what constitutes inconsistency or “opening the door” can be broader than defendants expect.
Derivative Use: Building a Stronger Case from Your Own Disclosures
Even if proffer statements are never directly introduced at trial, the government retains the right to use the information contained in them to:
- Serve subpoenas on banks, employers, or third-party financial institutions.
- Obtain search warrants for email accounts, home offices, or business premises — a particularly common consequence in wire fraud investigations where digital communications are central to the alleged scheme.
- Identify and interview additional witnesses or co-conspirators whose names arose during the session.
This derivative evidence can substantially strengthen the fraud case—not only against the proffering defendant but also against others—even though the original statements themselves never appear in court. Defendants often underestimate how significant this secondary effect can be.
The Risk of New Charges Under 18 U.S.C. § 1001
As noted above, inaccurate or incomplete statements during a proffer can trigger standalone felony charges under 18 U.S.C. § 1001. These charges are pursued independently of any underlying fraud indictment. A § 1001 count carries generally up to five years’ imprisonment per violation (up to eight years when the offense involves terrorism) and, perhaps more importantly, signals to the court that the defendant attempted to mislead federal investigators—an aggravating factor that is difficult to overcome at sentencing.
When Candor Expands Your Sentencing Exposure
Federal fraud sentencing under the U.S. Sentencing Guidelines is heavily driven by the total “loss” amount attributed to the offense, along with enhancements for factors such as the number of victims, sophistication of the scheme, and abuse of a position of trust. A candid proffer can reveal additional victims or transactions that the government was not previously aware of—information that directly increases the calculated loss amount and pushes the guidelines range higher. In extreme cases, a defendant’s own disclosure during a proffer can result in a higher guidelines range than the government could have proved without cooperation.
No Guarantee of a Deal or a 5K1.1 Motion
Proffer agreements typically do not guarantee any particular outcome. They do not guarantee a plea offer, a specific sentence, or that the government will file a § 5K1.1 motion. All of those decisions remain within the prosecutor’s unilateral discretion, subject to DOJ policy requirements. A defendant can complete a full proffer session, provide substantial information, and still find that the government declines to characterize the assistance as “substantial” under its internal guidelines. The potential benefit must always be weighed against the very real possibility of no return.
Special Considerations for NYC, Nassau County, and Suffolk County Defendants
Local Federal Practice in SDNY and EDNY
The Southern and Eastern Districts of New York are among the busiest and most sophisticated federal prosecutors’ offices in the country for complex fraud, securities, and health care matters. Both offices use proffer sessions as a routine tool in multi-defendant investigations. SDNY and EDNY prosecutors are experienced negotiators who understand the value of cooperation to their cases—which means they are also experienced at structuring proffer agreements in ways that maximize the information the government receives while minimizing its obligations.
An attorney who regularly practices before these courts understands the local norms: how SDNY and EDNY typically structure their proffer letters, what terms are generally negotiable, and what the realistic outcomes of cooperation look like in each district. This local knowledge is not a luxury—it is a practical necessity.
Parallel Civil and Regulatory Proceedings
A criminal proffer does not exist in a vacuum. For defendants who also face civil enforcement exposure—from the SEC, CFTC, HHS-OIG, or other regulatory agencies—the information shared in a criminal proffer can have consequences beyond the criminal case itself. While a proffer letter typically limits use “in the criminal proceeding,” other agencies may benefit indirectly from information DOJ shares through interagency channels consistent with applicable law and policy. Defendants navigating both criminal and civil exposure need counsel who understands both fronts.
Timing Issues for New York-Area Fraud Defendants
Because federal fraud investigations often run for months or years before charges are filed, the timing of a proffer decision matters enormously. Cooperating too early—before defense counsel has had the opportunity to review the government’s evidence—can lead to disclosures that exceed what the government could have obtained on its own, strengthening a case that might otherwise have been weak. Cooperating too late, after the government’s case is essentially complete, may eliminate any meaningful leverage for obtaining a 5K1.1 motion or charge reductions.
Once a proffer is on the record, it shapes the trajectory of the entire case. Co-defendants and the government will know the proffering defendant’s general posture. That reality must be factored into the decision from the outset. For context on how the federal court system operates compared to state court in New York, see our guide on federal vs. New York State courts.
How an Experienced Federal Defense Lawyer Helps
Evaluating Whether to Proffer at All
The single most important role of defense counsel at this stage is determining whether proffering is in the client’s best interest. That assessment requires:
- An honest evaluation of the strength and completeness of the government’s fraud evidence.
- An analysis of the client’s relative culpability within the alleged scheme.
- A judgment about whether the client has information the government does not already know—and whether that information is genuinely valuable to the investigation.
In cases where the government’s evidence is weak, defensible, or legally problematic, remaining silent and preparing to litigate may be a far safer course than opening the door to a proffer session.
Negotiating the Terms of the Agreement
While federal prosecutors often present proffer letters as standard or non-negotiable, experienced counsel may be able to negotiate specific terms—particularly around derivative use, sentencing use of statements, and what conduct constitutes a breach of the agreement. Not every AUSA will agree to modifications, and the leverage for negotiation is often limited. But in some cases, obtaining clearer limitations on the scope of derivative use or narrowing the impeachment exception can meaningfully reduce the risk to the client.
Preparing the Client for the Session
Thorough preparation is non-negotiable. Defense counsel should conduct multiple preparation sessions in which the client walks through the relevant facts, documents, timelines, and communications. Counsel should rehearse likely lines of questioning and ensure the client understands the boundaries of the agreement, the risk of § 1001 liability for false or misleading statements, and the importance of saying “I don’t remember” accurately rather than guessing. Inadvertent inconsistencies—caused by poor memory rather than intent to deceive—can still be characterized by aggressive prosecutors as false statements.
Protecting the Client During and After the Session
Active participation by counsel during the proffer session itself is essential. Defense counsel can object to inappropriate questions, seek to clarify ambiguous answers, and request breaks to confer privately before the client responds to particularly sensitive lines of inquiry. After the session, counsel’s role shifts to monitoring how the government uses the disclosed information, negotiating any formal cooperation agreement, and advocating at sentencing if cooperation credit is ultimately granted.
Frequently Asked Questions
Is a proffer agreement the same as a plea agreement?
No. A proffer agreement is typically a preliminary cooperation tool that does not itself resolve the criminal case. A separate plea agreement or formal cooperation agreement—negotiated after the proffer process—is required to actually dispose of the charges.
Can I refuse to sign a proffer agreement?
Yes. A target or defendant always has the right to decline a proffer invitation. That decision should be made only after consulting with experienced federal defense counsel who can weigh the specific facts and evidence of your case and the likely outcomes in SDNY or EDNY.
Will the prosecutor automatically file a 5K1.1 motion if I proffer?
No. There is no automatic right to a § 5K1.1 motion. Pursuant to DOJ policy, a motion requires a determination that the defendant provided “substantial assistance” in the investigation or prosecution of another person—and that determination is entirely within the prosecutor’s discretion.
Can my proffer statements be used against co-defendants?
Federal Rule of Evidence 410 limits use of proffer statements against the person who made them. It does not prevent the government from using derivative evidence—information obtained as a result of the proffer—against co-defendants or other targets. In practice, this means that candid cooperation can materially strengthen the government’s case against others in the same scheme.
What happens if I’m not completely truthful during the proffer?
Incomplete, misleading, or false statements can void the agreement and expose the client to separate felony charges under 18 U.S.C. § 1001. This is one of the most significant risks of any proffer session and underscores why thorough preparation with experienced counsel is essential.
Warning Signs You Need Immediate Counsel
Contact a federal criminal defense attorney without delay if you:
- Receive a target letter from a U.S. Attorney’s Office identifying you as a target of a federal grand jury investigation.
- Are served with a grand jury subpoena for documents, testimony, or both.
- Are contacted by federal agents—FBI, IRS-CI, HHS-OIG, or others—requesting an interview about any aspect of your business, financial, or professional activities.
- Learn that colleagues, business partners, or co-defendants have already proffered or begun cooperating with the government.
Each of these events marks a critical juncture. Statements made to federal agents before retaining counsel—even informal ones—can be used against you under § 1001, and early strategic decisions shape everything that follows.
Contact Lebedin Kofman LLP for Federal Fraud Defense in New York
Proffer agreements are among the most strategically complex decisions a federal fraud defendant will face. The protections they offer are real but narrow, the risks are substantial and sometimes underappreciated, and the outcomes depend heavily on timing, preparation, and the terms of the agreement itself.
At Lebedin Kofman LLP, our federal defense practice represents individuals under investigation and facing charges in the Southern and Eastern Districts of New York, including cases involving wire fraud, securities fraud, health care fraud, bank fraud, and related white-collar offenses throughout New York City, Nassau County, and Suffolk County. If you or a family member has received a target letter, grand jury subpoena, or contact from federal agents, contact us for a confidential consultation before speaking with any investigator or prosecutor.