If someone forged your endorsement on a check and a bank processed it, UCC 3-420 lets you sue that bank for the face value of the instrument as if the bank had stolen your property. Conversion of a negotiable instrument under UCC 3-420 treats the check itself as personal property, so a bank that pays out on a forged endorsement is liable to the rightful payee regardless of whether the bank knew anything was wrong.1Legal Information Institute. UCC 3-420 – Conversion of Instrument That property framing is what makes the remedy powerful: you are not proving fraud or negligence, you are proving the check was yours and the bank gave the money to someone else.
What the Statute Actually Does
Conversion is unauthorized control over someone else’s property. UCC 3-420 says an instrument is converted in two main ways: someone takes it by transfer from a person who had no right to enforce it, or a bank pays out on it to someone not entitled to the money.1Legal Information Institute. UCC 3-420 – Conversion of Instrument General property conversion law fills in around the statute, so the rules that govern stolen cars govern stolen checks.
The point that trips people up: intent is irrelevant on the bank’s side. A depositary bank that accepts a forged check in complete good faith has still converted the instrument. The civil question is not whether anyone meant to commit fraud. It is whether you lost control of property that belonged to you.
When a Bank Has Converted Your Check
The classic case is the forged endorsement. A check is stolen from the mailbox, someone signs the payee’s name on the back, and a bank deposits it into the thief’s account. That bank has converted the instrument.1Legal Information Institute. UCC 3-420 – Conversion of Instrument
Missing co-payee signatures also trigger conversion. When a check is made out to two people joined by “and,” both have to endorse it. If a bank accepts the check with only one signature, it has converted the instrument as to the other payee.
Other recurring patterns: an employee intercepts company checks and routes them to a personal account; a check payable to one business gets deposited by a differently-named business; a depositary bank accepts a check for collection from someone who plainly lacks authority. The common thread is that the funds ended up somewhere the payee never authorized.
Who Can Sue, and Who Cannot
Standing belongs to the payee named on the instrument, or to anyone who received the check through a valid endorsement chain. You have to show you had a legal right to the funds when the conversion happened, and a critical piece of that is proving the check was delivered to you.1Legal Information Institute. UCC 3-420 – Conversion of Instrument
Delivery does not mean you had to physically hold the check. Under the UCC’s official commentary, a check is delivered when it reaches your possession, and the mail carrier dropping it in your mailbox counts. Delivery to an agent counts as delivery to you. If the check names multiple payees, delivery to any one of them counts as delivery to all. Once that delivery happens, the check is your property, and a thief who takes it from your mailbox has stolen from you.
Endorsees down the chain have standing too. If a contractor endorses a check over to a supplier and someone intercepts it before the supplier deposits it, the supplier is the one who can sue the depositary bank.
Two categories are shut out of a conversion claim. The drawer, meaning the person who wrote the check, cannot sue under 3-420. The drawer’s remedy runs against their own bank under UCC 4-401 for charging the account with an item that was not “properly payable.”2Legal Information Institute. UCC 4-401 – When Bank May Charge Customers Account A payee who never received delivery also cannot sue. If the check was stolen from the drawer’s outgoing mail before it ever reached you, you never held any property interest in it. You were not paid, but you were not robbed of anything either. Your recourse is to go back to the drawer and demand payment of the underlying debt.
Which Bank You Can Sue
Two banks face exposure. The depositary bank is the first bank to accept the check for deposit or collection. When it takes a forged check from a thief, it has converted the payee’s property. The payor bank, which is the bank that pays out on the check writer’s account, is also liable when it pays on a forged endorsement. You can choose which to sue, and in practice many payees go after the depositary bank because it dealt with the person committing the fraud and had the best chance to catch the problem.
UCC 3-420 works as essentially strict liability against banks. You do not have to prove the bank was careless or knew about the forgery. If it paid funds to someone not entitled to receive them, that is conversion. The statute also carves out a limited good-faith defense for representatives who handle converted instruments, but it deliberately excludes depositary banks from that shelter.1Legal Information Institute. UCC 3-420 – Conversion of Instrument Banks stay on the hook for the full amount even when they acted honestly, because they are in the best position to verify endorsements before processing.
Defenses That Can Cut Your Recovery
Strict liability does not mean banks lose every case. Three UCC provisions can shift the loss back onto you.
Your Own Negligence
UCC 3-406 bars a plaintiff whose failure to exercise ordinary care substantially contributed to the forgery from asserting it against a bank that paid in good faith.3Legal Information Institute. UCC 3-406 – Negligence Contributing to Forged Signature or Alteration of Instrument Leaving endorsed checks in an unlocked mailroom is the sort of thing that qualifies. The bank has to prove your carelessness, and if the bank was also careless the loss gets split between you based on how much each side contributed to it.
Employee Fraud
UCC 3-405 shifts liability to the employer when a trusted employee forges endorsements. If your company gave an employee responsibility over instruments and that employee committed the fraud, the forged endorsement is treated as effective, meaning the bank is off the hook. “Responsibility” is defined broadly under this section: signing checks, processing incoming instruments, preparing outgoing payments, supplying payee information, or controlling how instruments are handled all count. It extends to independent contractors. The exception is that if the bank itself failed to exercise ordinary care and that failure contributed to the loss, the employer can recover from the bank to the extent of the bank’s carelessness.4Legal Information Institute. UCC 3-405 – Employers Responsibility for Fraudulent Indorsement by Employee
Impostors and Fictitious Payees
UCC 3-404 covers situations where someone impersonated the payee and tricked the drawer into issuing the check, or where the payee was a fictitious person created as part of the scheme. Any endorsement in that payee’s name is treated as effective against a bank that processed the check in good faith. The loss falls on whoever was duped into writing the check. A bank that failed to exercise ordinary care loses this protection proportionally.
What You Can Recover
Damages are presumed to be the face value of the instrument. UCC 3-420(b) caps your recovery at your actual interest in the check.1Legal Information Institute. UCC 3-420 – Conversion of Instrument If a $10,000 check was payable to you and a partner equally and only you sue, you recover $5,000.
Plaintiffs typically seek prejudgment interest running from the date of the conversion. Whether it is available and at what rate depends on state law, with some states allowing it only for liquidated claims or written instruments and others taking a broader approach. Attorney fees and punitive damages are not part of the standard UCC recovery. The statute is built to make you whole by restoring the value of the instrument, not to punish the bank.
The Three-Year Deadline
A conversion claim must be filed within three years after the cause of action accrues.5Legal Information Institute. UCC 3-118 – Statute of Limitations The clock generally starts when the bank processes the forged instrument, not when you discover the problem. That timing is unforgiving. If you assumed a payment never went out, and the drawer assumed you received it, months or years can pass before anyone compares notes. By the time the forgery surfaces, a large chunk of the limitations period may already be gone. If you suspect a check meant for you was intercepted or cashed by someone else, pull records and talk to an attorney quickly.