A cashier's check is bank-guaranteed when it is real, but federal rules make the funds available before the check clears. A counterfeit can look perfect, deposit cleanly, and bounce days or weeks later, after you have already handed over the car and wired back the overpayment.
Why the funds show up before the check is real
A cashier's check is different from a personal check because the bank itself guarantees the funds. When a bank issues one, it pulls the money from the buyer's account and becomes directly obligated to pay. Under the Uniform Commercial Code, the issuing bank owes the money to whoever is entitled to enforce the check. That guarantee is why sellers trust cashier's checks, and it is also why counterfeits work so well.
The trap is timing. Under Regulation CC, a cashier's check deposited in person can be available the next business day, with the first $6,725 available fast under the threshold that took effect July 1, 2025. But availability is not clearance. The check still has to travel back to the issuing bank for verification, and a counterfeit can take days or weeks to come back as fake. The bank extends provisional credit in the meantime, and it can reverse that credit even after you have spent it.
Related reading on this site: Home and Hold-and-Release Bots: How Inventory Gets Hoarded Before It Sells cover the neighbouring problems in more depth.
The overpayment play, step by step
The most common version of the scam does not rely on a convincing forgery alone. A buyer, often communicating remotely, sends a cashier's check for more than the agreed price. They ask you to deposit it and wire back the overpayment for shipping or a fee. You deposit the check, see the funds appear the next day, and send the difference. Days or weeks later the bank discovers the check was fake, reverses the deposit, and you are out both the refund and the car.
The details are designed to survive a visual check. Modern printing equipment produces fakes with bank logos, watermarks, and security patterns that look right. The MICR line along the bottom can have inconsistent spacing or a routing number that traces to a different bank than the logo. The phone number printed on the check often connects to an accomplice who cheerfully confirms the check is real. Physical inspection alone is not a reliable way to confirm a cashier's check.
How to verify a check before the title moves
Verify the check before you hand over the title, not after. Call the issuing bank using a number you look up yourself through the bank's official website or a directory you trust, never the number printed on the check. Confirm the check number, the exact dollar amount, and the payee name. If you are unsure the bank even exists, the FDIC's BankFind tool lets you search any FDIC-insured institution by name. A check drawn on a bank that does not appear in BankFind is almost certainly fraudulent.
The strongest version is to meet at the buyer's bank and watch the check being issued, or to accept payment inside your own bank where a teller can verify it on the spot. For a large transaction, that trip is worth it. Never hand over the title on the strength of funds showing as available, and never wire back an overpayment for any reason. A real buyer who overpaid can get a new check for the right amount. A scammer cannot.
Frequently asked questions
Are cashier's checks safe for private car sales?
A real one is one of the safest ways to get paid, because the issuing bank guarantees the funds. The risk is a counterfeit. Modern printers can fake watermarks, security threads, and microprinting well enough to fool a visual check.
How long does it take for a fake cashier's check to bounce?
Days to weeks. Under Regulation CC, a cashier's check deposited in person can be available the next business day, but the check still has to travel back to the issuing bank for verification. The bank can reverse the provisional credit even after you have spent it.
What is the overpayment scam?
A buyer sends a cashier's check for more than the agreed price, then asks you to wire back the difference for shipping or a fee. You deposit the check, see the money, send the refund, and then the check bounces. You lose the refund and the car.
How do I verify a cashier's check?
Call the issuing bank using a number you look up yourself, never the number printed on the check. Confirm the check number, amount, and payee. You can also check that the bank exists through the FDIC's BankFind tool, and meet at the buyer's bank to watch the check being issued.