McMahon Law Offices
Charged with fraud, embezzlement, or a financial crime in DuPage County? A former prosecutor and retired judge know exactly how the state and federal government build white collar cases and where they fall apart. Call for a free case review.
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If you need someone to represent you in DuPage County for criminal court, Mike is the best lawyer you can call — hands down. I don't believe I could have had a better outcome with anyone else.
Mike and Jes are truly the best. I've used other attorneys in the past and it was a huge mistake. Mike saved my license, kept me driving, and cleaned up my past record with an expungement. I highly recommend him.
Mr. McMahon was extremely professional, polite, and dedicated to seeing our case through to the end. He kept open communication and got us the outcome we wanted. I recommend him to anyone looking for representation.
Mike and his staff were very professional and really helped me out during a tough time. His team handled all the leg work, and Mike was a straight shooter, which I really appreciated. Two thumbs up!
Mike is, by far, the best lawyer to represent you in any traffic or criminal issue. Me and my family have been using him for almost 20 years and he has never once disappointed us. Professional, caring, and an expert in his field.
Michael McMahon delivered outstanding representation in our traffic case with professionalism and efficiency. He resolved our concerns and secured a swift dismissal. We feel fortunate to have found him and highly recommend his services.
Hands down one of the best DUI lawyers out there. He helped me beat my case and charged a fair price. My boss recommended him when I was very stressed about my situation. 100% would recommend.
Mike is extremely knowledgeable about navigating the legal system. I truly believe I would have had a far worse outcome without his expertise. He exceeded my initial expectations. Would highly recommend.
Highly recommend. Mike did an excellent job resolving my DUI case. He guided me through every step and kept me informed the whole way. The case is fully resolved and I'm back to normal life. Very thankful.
Mike was fantastic to work with. Very responsive to my messages and answered every question I had. He got me a very favorable outcome in court, despite it being a hard case. I highly recommend Mike!
If you are looking for the best criminal defense attorney in Illinois, look no further than Mike McMahon. Saved me in DuPage County and Cook County. He is hands down the best in the business.
Michael and Jessica are amazing! Michael was able to get my charges dropped to a minimal amount in a short time. I had to change attorneys midway and Michael got me the best outcome possible. Couldn't be more pleased.
We received excellent service from Mike. Staff support was excellent too. They know their job, are fully prepared, and committed to their clients. Most important, they kept their promise. Thank you!
Mike McMahon is probably the best DUI attorney in Illinois. He honestly cares about his clients and their well-being, unlike other attorneys who just want your money.
We received excellent service. Extremely caring, communicative, and professional. Highly recommend!
I was treated with the utmost respect and honesty by Mike and his staff. I would highly recommend his team to anyone seeking commitment and support during any ordeal, with positive results.
Amazing — this guy is the best! I don't want to think about where I would be without him.
Great work, no doubt he will get you out of trouble!
Mike gets it done!
"White collar investigations start long before an arrest. By the time charges are filed, the government has been building their case for months. Getting ahead of it is everything."
— Mike McMahon, Former DuPage County ProsecutorWhite Collar Crime Defense Overview
A white collar charge in DuPage County can mean felony convictions, years in prison, massive restitution orders, and the permanent loss of your professional license, business, and reputation — consequences that extend far beyond the criminal case itself.
Most clients we represent are professionals and business owners facing allegations that mischaracterize legitimate transactions, accounting errors, or business decisions as criminal conduct. They are executives caught in ambiguous financial situations, employees accused of theft by employers with their own motives, or individuals investigated for conduct that was legal at the time. An accusation of fraud does not make you a fraudster.
Mike McMahon prosecuted financial crimes for the state. He knows how prosecutors use financial records, cooperating witnesses, and paper trails to build fraud cases — and exactly where those cases are most vulnerable to challenge. Judge Pierce presided over white collar trials and knows what evidence gets excluded, what expert testimony carries weight, and what arguments create reasonable doubt in DuPage County courts.
We fight to get white collar charges dismissed, reduced, or beaten at trial. We challenge intent, dispute financial calculations, expose unreliable cooperating witnesses, and identify constitutional violations in every case — and we engage early when investigations are still ongoing to protect your rights before charges are ever filed.
Illinois White Collar Crimes
| Charge | Classification | |
|---|---|---|
Fraud Obtaining money, property, or services through deception, false pretenses, or misrepresentation. Penalties scale significantly based on the amount involved and the method of deception. 720 ILCS 5/17-1 |
Class 4 Felony to Class 1 Felony | |
Embezzlement Theft by an employee, officer, or person in a position of trust who diverts funds or property for personal use. Enhanced penalties and professional license consequences on conviction. 720 ILCS 5/16-1 |
Class 3 Felony to Class 1 Felony | |
Identity Theft Using another person's personal identifying information without authorization to obtain credit, money, goods, or services. Severe credit, employment, and immigration consequences on conviction. 720 ILCS 5/16-30 |
Class 4 Felony to Class 1 Felony | |
Forgery Making, altering, or using a forged document with intent to defraud. Commonly charged in cases involving altered checks, contracts, prescriptions, or government documents. 720 ILCS 5/17-3 |
Class 3 Felony | |
Money Laundering Concealing or disguising the proceeds of criminal activity through financial transactions to make them appear legitimate. Carries severe penalties and asset forfeiture consequences. 720 ILCS 5/29B-1 |
Class 1 Felony to Class X Felony | |
Bribery Offering, giving, receiving, or soliciting something of value to influence the actions of a public official or person in a position of authority. Felony charge with career-ending professional consequences. 720 ILCS 5/33-1 |
Class 2 Felony | |
Tax Fraud Willfully filing false tax returns, underreporting income, or evading tax obligations under Illinois or federal law. Can be charged as a state or federal felony with substantial restitution obligations. 35 ILCS 5/1301 |
Class 4 Felony to Class 1 Felony | |
Insurance Fraud Submitting false or inflated insurance claims, staging accidents, or misrepresenting facts to obtain insurance proceeds. Aggressively investigated by insurance company special investigation units. 720 ILCS 5/17-10.5 |
Class 4 Felony to Class 1 Felony | |
Wire Fraud Using electronic communications — phone, email, or wire transfers — to execute a scheme to defraud. A federal charge that carries up to 20 years in federal prison per count. 18 U.S.C. § 1343 |
Federal Felony (Up to 20 Years) | |
Mail Fraud Using the U.S. mail system as part of a scheme to defraud. Federal prosecutors stack mail fraud counts aggressively, multiplying the sentencing exposure with each mailing involved. 18 U.S.C. § 1341 |
Federal Felony (Up to 20 Years) | |
Check Fraud Writing bad checks, altering checks, or issuing checks on closed accounts with intent to defraud. Penalties based on the total amount across all transactions. 720 ILCS 5/17-1 |
Class A Misdemeanor to Class 3 Felony | |
Credit Card Fraud Unauthorized use of credit or debit card information to obtain goods, services, or cash advances. Penalties escalate significantly based on the total amount and pattern of fraudulent transactions. 720 ILCS 5/17-36 |
Class A Misdemeanor to Class 2 Felony | |
Securities Fraud Manipulating financial markets, misrepresenting investment information, or operating unlicensed investment schemes. Prosecuted by both state and federal authorities with significant prison exposure. 815 ILCS 5/12 |
Class 2 Felony to Federal Felony | |
Racketeering / RICO Participating in an organized pattern of criminal activity through an enterprise. Federal RICO charges carry mandatory 20-year sentences and allow for civil asset forfeiture in addition to criminal penalties. 18 U.S.C. § 1962 |
Federal Felony (Up to 20 Years) |
White Collar Case Results
Every result below is a real white collar case handled in DuPage County.
Why McMahon Law Offices
Former prosecutors who built financial crime cases now use that knowledge to tear them apart.
DCBA Member
Top 100 Trial Lawyers
ISBA Member
IPBA Member
Avvo Rating 10.0
5-Star ReviewsMike McMahon built fraud and financial crime cases for the state. He knows how prosecutors use financial records, cooperating witnesses, and documentary evidence — and exactly where those cases are most vulnerable to challenge on intent and reliability grounds.
White collar investigations unfold over months before an arrest. If you know you are under investigation — subpoenas, grand jury notices, search warrants — we intervene immediately. Pre-charge engagement often changes the outcome entirely, preventing prosecution before it begins.
Every financial crime requires the state to prove you acted with criminal intent — not that you made a mistake, misunderstood an agreement, or relied on bad advice. We build the factual record that distinguishes legitimate business decisions and honest errors from the intentional deception the state must prove.
Prosecutors inflate loss figures to maximize sentencing exposure. In Illinois and federal court, the alleged loss amount drives the felony classification and sentence length. We bring forensic accounting analysis to challenge inflated restitution demands and reduce the financial stakes of every case.
Judge Pierce decided financial crime cases from the bench for decades. He knows what expert testimony carries weight, what documentary evidence gets excluded, and how to position complex white collar cases for the best outcome with every judge in Wheaton and every federal judge in the Northern District.
A white collar conviction ends careers. Professional licenses in law, medicine, finance, real estate, and accounting are revoked on felony conviction. We pursue outcomes — dismissal, supervision, misdemeanor reduction — specifically designed to preserve your professional license, your reputation, and your ability to continue working in your field.
How To Get Started
A clear, strategic process from your first call through resolution — whether charges have been filed or not.
Call us or fill out our contact form the moment you learn you are under investigation. Do not speak to investigators, produce documents, or respond to subpoenas without counsel. White collar cases are built during the investigation phase — early intervention is when we can do the most.
Tell us what the investigation involves, what documents have been subpoenaed, what financial transactions are at issue, and your role in the organization or situation. White collar cases are won or lost in the details of what the financial records actually show.
We obtain all financial records and documentary evidence, engage forensic accounting experts to challenge loss calculations, identify intent defenses and legitimate business explanations, and file motions to suppress improperly obtained evidence and challenge subpoena scope.
Pre-charge declination, dismissal, charge reduction, supervision, or acquittal at trial. We pursue the strongest outcome your case allows while protecting your professional license, your record, and your reputation at every step of the process.
Your White Collar Defense Team
A former prosecutor who built financial crime cases and a retired judge who decided them for decades.
Areas We Serve
We defend white collar charges throughout DuPage County, neighboring Illinois counties, and federal court.
2150 McDonald Dr Suite 1608
Oak Brook, IL 60523
Available for in-person case reviews upon request. We defend white collar charges in all of DuPage County, neighboring Illinois counties, and federal cases in the Northern District of Illinois.
FAQ
Straight answers. No legalese.
Do not speak to investigators, produce documents, or respond to a subpoena without retaining an attorney first. Anything you say to investigators can be used against you — and white collar defendants often make their situation significantly worse by trying to explain transactions before they understand what the government actually knows. Call us immediately. The pre-charge phase is when we have the most options. We can engage with prosecutors, manage document production, and in many cases prevent charges from being filed at all.
Criminal fraud requires proof of intentional deception — the state must show you knowingly made a false representation with the intent to obtain money or property. Accounting errors, business disputes, misunderstandings about contractual obligations, and reliance on bad professional advice are not fraud. This distinction is the centerpiece of most white collar defenses. We build the documentary and testimonial record that demonstrates the conduct at issue was a legitimate business decision, an honest error, or the result of advice you reasonably relied on — not the intentional deception the state must prove beyond a reasonable doubt.
State charges under Illinois law are prosecuted by the DuPage County State's Attorney and handled in DuPage County circuit court. Federal charges — wire fraud, mail fraud, bank fraud, RICO, and tax evasion — are prosecuted by U.S. Attorneys and handled in federal district court under the Northern District of Illinois. Federal cases carry mandatory minimum sentences, federal sentencing guidelines that dramatically increase exposure based on loss amounts, and no parole. The investigation agencies are different too — federal cases typically involve the FBI, IRS Criminal Investigation, or the Secret Service. We handle both state and federal white collar cases and understand how the two systems interact when parallel investigations occur.
In both Illinois and federal court, the alleged loss amount directly determines the severity of the charge and the length of the sentence. Under Illinois law, theft and fraud penalties escalate from misdemeanor to Class 1 felony based on whether the amount exceeds $500, $10,000, or $100,000. Under federal sentencing guidelines, loss amount drives the offense level upward, often adding years to the recommended sentencing range. Prosecutors frequently calculate loss in the most expansive way possible. We challenge those calculations with forensic accounting analysis, dispute the methodology used, and argue for the most favorable loss figure the facts support — because every dollar we remove from the loss calculation reduces your exposure.
Yes, almost certainly for a felony conviction. Illinois licensing boards for attorneys, physicians, nurses, accountants, financial advisors, real estate agents, and contractors are required to consider felony convictions — and dishonesty-related offenses in particular — in license renewal and revocation proceedings. Many professions mandate automatic revocation on conviction of a crime of moral turpitude, which includes fraud, embezzlement, and forgery. Protecting your professional license is one of the most consequential reasons to fight white collar charges aggressively, and we build every defense with those collateral consequences in mind from day one.
A cooperating witness is someone who agrees to testify against you in exchange for reduced charges or a lighter sentence. Federal white collar prosecutions frequently rely on cooperating witnesses — often co-defendants or business associates who have their own legal exposure and a strong incentive to exaggerate or shift blame. We attack cooperating witness testimony by exposing their plea agreements, the benefits they received for their cooperation, prior inconsistent statements, and the specific reasons they have to lie. Juries understand that a witness who is testifying to save themselves has a powerful motive to say whatever the government needs to hear.
Yes. In white collar cases, both Illinois and federal law allow the government to seize assets alleged to be proceeds of criminal activity or used to facilitate it. This can include bank accounts, real estate, vehicles, and business assets — sometimes before conviction, through pre-indictment restraining orders. Asset forfeiture is a separate legal proceeding from the criminal case and requires its own defense strategy. We challenge forfeiture actions by contesting the connection between the assets and the alleged criminal conduct, protecting legitimate assets from seizure, and negotiating the return of seized property where possible.
State white collar cases in DuPage County typically take 12 to 24 months from charges to resolution, depending on the volume of financial records, the number of counts, and whether the case goes to trial. Federal white collar cases take significantly longer — 18 to 36 months is common, and complex multi-defendant cases can run three or more years. Investigations that begin before charges are filed can add another 6 to 18 months to the total timeline. We give you a realistic assessment at your free consultation based on the specific charges, the scope of the investigation, and the forum where the case is or will be filed.
Resources
Guides written to help you understand white collar charges, your rights during an investigation, and your options in DuPage County and federal court.



Get Started
Submit a contact form or call us to schedule your free white collar case review. Whether you have been charged or are still under investigation, early intervention is everything. The sooner we engage, the more we can do to protect your freedom, your license, and your reputation.
Your information is confidential and protected by attorney-client privilege. We will never share your information.