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An altered check is a paper check that has been physically modified after it was issued by the drawer, typically by changing the payee name, the dollar amount, or both. Under Section 3-407 of the Uniform Commercial Code, an alteration is defined as an unauthorized change to the terms of the instrument that modifies the obligation of a party. The modification must be made on the original check itself. This distinguishes an altered check from a counterfeit check, which is a fraudulent instrument created from scratch or fabricated from an image of a genuine check.
That distinction matters enormously because it determines which bank absorbs the financial loss when fraud is discovered.
The most common method used to alter checks is check washing, which has grown significantly as a fraud technique in recent years. A fraudster intercepts a legitimate check, typically from a mailbox, and uses chemical solvents to dissolve the ink of the payee name and dollar amount while leaving the drawer's signature intact. New information is written in the blank spaces, often inflating the amount or substituting a different payee. The original signature is preserved because it was written with ballpoint ink that resists the chemicals used in washing.
The Office of the Comptroller of the Currency advises check writers to leave no large blank spaces in the amount and payee lines when writing checks, since gaps make it easier to add fraudulent information after washing.
The Uniform Commercial Code allocates check fraud losses based on the type of fraud and where the check entered the banking system. For altered checks, the depository bank (the institution where the fraudster deposited the check) generally bears the loss, because it is in the best position to examine both the depositor and the instrument before accepting it into the system. The depository bank makes a presentment warranty to the payor bank (the bank on which the check is drawn) that the check has not been altered. If the check was in fact altered, the depository bank breached that warranty and is liable.
For forged or counterfeit checks (those with unauthorized drawer signatures), the payor bank bears the loss under the principle established by the 1762 English case Price v. Neal, because the payor bank is best positioned to recognize its own customer's signature. This allocation of liability is codified in the UCC and has been the foundation of check fraud law in the United States for centuries.
Account holders are not passive victims with no responsibility under UCC rules. Section 4-406 imposes a duty on customers to examine their bank statements with reasonable promptness and notify the bank of any altered or unauthorized items. A customer who fails to report a fraudulent check within 30 days of the statement becoming available loses the right to hold the bank liable for subsequent fraud by the same fraudster. More broadly, a customer who sits on a fraud claim for more than one year faces an absolute bar to recovery under UCC Section 4-406(f), regardless of fault.
The bank may also raise a comparative negligence defense if the customer's own failure to safeguard checks substantially contributed to the alteration. However, courts have generally set a high bar for banks attempting to prove customer negligence caused the loss.
Altering a check is a criminal offense in every U.S. jurisdiction. If the altered amount exceeds $1,000, the crime is typically prosecuted as a felony. Alterations involving amounts below $1,000 are generally misdemeanors. Penalties vary significantly by state and depend on factors including the amount involved, whether the fraud was part of a pattern, and whether it constituted organized criminal activity.
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