The penalty for writing on money under federal law is up to six months in jail and a fine of up to $5,000, but only if you wrote on the bill with the intent to make it unfit to be put back into circulation. That intent requirement is what keeps a doodle in the margin of a $20 from being treated the same as deliberately blacking out serial numbers on a stack of bills.
What the Law Actually Prohibits
The governing statute is 18 U.S.C. § 333, titled “Mutilation of national bank obligations.” It makes it a crime to deface, cut, or otherwise alter any bill, note, or other debt instrument issued by a national banking association, a Federal Reserve bank, or the Federal Reserve System.1Office of the Law Revision Counsel. 18 USC 333 – Mutilation of National Bank Obligations
The phrase that does the real work in the statute is “with intent to render such bank bill…unfit to be reissued.” Writing your name on a bill to settle a bet is technically covered by the words of the law, but nobody is going to argue you meant to destroy the bill’s usefulness. Running twenties through a printer to plaster them with ads, or deliberately obscuring the security features, is a different matter. There, intent becomes much harder to deny.
The same intent standard is why currency-tracking projects like Where’s George sit in a gray area rather than a courtroom. A small stamp with a URL does not render a bill unfit, and the person applying it has no plan to. The bill still spends and still passes through Federal Reserve processing.
How Much Jail Time and How Big a Fine
A conviction under § 333 is a Class B federal misdemeanor. The maximum jail sentence is six months.1Office of the Law Revision Counsel. 18 USC 333 – Mutilation of National Bank Obligations The general federal sentencing statute caps the fine at $5,000 for an individual convicted at this offense level.2Office of the Law Revision Counsel. 18 US Code 3571 – Sentence of Fine A judge can impose the fine alone, jail time alone, or both.
Because § 333 is a federal statute, any prosecution goes through a United States District Court. A conviction lands on a federal criminal record even though the offense is a misdemeanor, and probation or supervised release can follow any confinement. Attorney fees and court costs add to the real bill.
How Often People Are Actually Prosecuted
These penalties exist mostly on paper. The only widely documented prosecution under § 333 is United States v. Amidon from 1980, where the defendant pleaded guilty to two counts of mutilating national bank obligations. Courts have noted that many statutes in this chapter have never been judicially tested. Federal prosecutors have shown little interest in charging casual defacement and tend to save their attention for more serious currency crimes.
That does not mean writing on a bill is risk-free. It means the practical exposure comes from the scale and character of what you do, not from occasional markings. Bulk stamping, systematic destruction, or anything that looks like a scheme is what draws attention.
Stamping Ads on Bills Is a Separate Offense
A different statute, 18 U.S.C. § 475, targets using money as advertising space. It prohibits printing, writing, or attaching any business card, notice, or advertisement onto any U.S. obligation or security, including paper currency and coins.3Office of the Law Revision Counsel. 18 USC 475 – Imitating Obligations or Securities; Advertisements
Section 475 does not require any proof of intent to make the bill unusable. Stamping a phone number or website onto a bill is enough. The penalty is lighter than § 333: a fine of up to $5,000 and no possibility of imprisonment, because the offense is classified as a federal infraction rather than a misdemeanor. Someone stamping “Call Joe’s Plumbing” on fifty-dollar bills could face a fine even if every one of those bills still spends normally.
When Writing on a Bill Becomes Counterfeiting
The stakes change entirely when the writing alters what the bill appears to be worth. Modifying a $1 bill to look like a $100 and trying to pass it moves the case from misdemeanor defacement to felony counterfeiting under 18 U.S.C. § 471, which carries a maximum sentence of 20 years in federal prison.4Office of the Law Revision Counsel. 18 US Code 471 – Obligations or Securities of United States
The dividing line is what your writing does to the bill’s apparent value. Drawing a mustache on Andrew Jackson is defacement. Changing the denomination numerals is counterfeiting. The moment an alteration could deceive someone about what the bill is worth, the potential prison time multiplies by a factor of forty.
Coins Are Governed by a Different Rule
Writing on paper money and altering coins are not the same offense. Under 18 U.S.C. § 331, anyone who “fraudulently” alters, defaces, or mutilates U.S. coins faces up to five years in prison and a fine.5Office of the Law Revision Counsel. 18 USC 331 – Mutilation, Diminution, and Falsification of Coins “Fraudulently” is a higher bar than § 333’s “intent to render unfit.” The alteration has to be done for a dishonest purpose, like shaving metal from coins or reshaping a nickel to fool a vending machine.
That fraud requirement is why souvenir penny-pressing machines at tourist attractions are legal. Nobody feeds a penny into one intending to commit fraud, and no one is deceived by the flattened result.
What to Do With a Written-On Bill
A bill someone else has scribbled on is still worth its face value. Bills that are dirty, torn, worn, or defaced but still clearly more than half intact are classified as “unfit” and can be deposited at any commercial bank, which forwards them to the Federal Reserve for destruction and replacement.6eCFR. Title 31, Subpart B – Request for Examination of Mutilated Currency for Possible Redemption Most casually marked bills go this route without any trouble.
Merchants are not required to accept any particular bill, even legal tender. A cashier who sees a note covered in ink or stamps can turn the transaction down. The bill still holds its value; it just may not be the one you want to hand over at the register.