If someone transfers money to your account by mistake, the money is not yours to keep or spend — call your bank, report the deposit as unrecognized, and leave the funds untouched until the bank reverses the transaction. Spending it exposes you to criminal theft charges, a negative balance when the bank claws the money back, and civil liability to the sender.
What to Do the Moment You Notice It
Call your bank first. Tell them you don’t recognize the deposit and believe it was sent in error, and give them the date and amount so they can flag it. That phone call creates a timestamped record that you acted honestly, which matters if anyone later questions what you did with the money.
Follow the call with a written notice. Under the federal rules for electronic fund transfers, an effective error notice should identify the type of error, the date, the amount, and enough information for the bank to find your account.1Consumer Financial Protection Bureau. 12 CFR Part 1005 – Electronic Fund Transfers (Regulation E) – Section 1005.11 Keep copies of everything you send and everything the bank sends back.
While the investigation runs, treat the money as if it isn’t there. Don’t spend it, don’t transfer it, don’t move it into savings to earn interest. Any movement can look like you were trying to benefit from someone else’s mistake.
Why the Money Isn’t Yours
An unexpected deposit doesn’t become your property just because it reached your account. The doctrine of unjust enrichment prevents anyone from profiting at another person’s expense due to a mistake, and courts consistently hold that money paid in error creates an obligation to give it back. That obligation applies whether the sender was a stranger, a business, or the bank itself.
Your bank also doesn’t need your permission to fix the error. The deposit account agreement you signed gives the bank authority to debit your account for a mistaken credit.2HelpWithMyBank.gov. Banking Errors and Disputes The Uniform Commercial Code separately gives banks a right of chargeback when a provisional settlement fails, whether or not you’ve already used the funds.3Legal Information Institute. UCC 4-214 Right of Charge-Back or Refund
Don’t Send the Money Back to Anyone Who Contacts You
If a stranger messages you claiming the deposit was theirs and asks you to send it back through a payment app or wire, don’t. This is one of the most common payment scams running right now. The scheme: a scammer links a stolen card to a payment app, sends money to you, then pleads for a refund. You send money back out of your own funds. Later, the real cardholder disputes the fraudulent charge, the original payment is pulled from your account, and you lose both the “refund” you sent and the original deposit.
Legitimate senders recover their money through their bank, not by asking strangers to wire funds back. Your bank has a process for verifying the error and routing the money to its source. Let that process work. Pressure to act fast is itself a red flag.
How the Bank Reverses a Mistaken Deposit
The mechanics depend on how the money arrived. For ACH transfers — the most common type for direct deposits and bank-to-bank payments — the originating bank can request a reversal within five banking days of settlement.4Nacha. ACH Network Rules: Reversals and Enforcement Wire transfers are harder to pull back; once a wire clears, it is generally irrevocable, and the sending bank has to ask the receiving bank to cooperate.
Once you report the deposit, Regulation E requires the bank to investigate. The bank generally has 10 business days to finish, or up to 45 days if it provisionally credits your account while it keeps looking. New accounts, point-of-sale debit transactions, and international transfers get a longer window of up to 90 days.5Consumer Financial Protection Bureau. 12 CFR Part 1005 – Electronic Fund Transfers (Regulation E) – Section 1005.11(c)(3)
Because the bank can debit your account whenever it confirms the error, spending the deposit is genuinely risky. If the money is gone when the reversal hits, your balance goes negative. You’ll owe that negative balance, and after a short grace period the bank can start adding overdraft-related fees.6Consumer Financial Protection Bureau. 12 CFR Part 1005 – Electronic Fund Transfers (Regulation E) – Section 1005.11(d)
Criminal Risk If You Spend It
Spending a mistaken deposit can bring theft charges. If you knew the money wasn’t yours and used it anyway, that is treated as taking someone else’s property. Prosecutors have to prove you knew the deposit was a mistake, but that bar is lower than people assume. A $120,000 deposit landing in a checking account that normally holds a few hundred dollars speaks for itself.
The severity depends on the amount. Every state has a dollar threshold where theft moves from misdemeanor to felony, with thresholds ranging from $500 to $2,500 depending on the state. A few thousand dollars spent from a mistaken deposit can put you in felony territory, with the possibility of prison time rather than just fines.
In a 2019 Pennsylvania case, a couple faced felony theft charges after their bank accidentally deposited $120,000 into their joint account. They spent most of it on vehicles, bills, and gifts to friends, and both told investigators they knew the money wasn’t theirs. The bank also hit them with roughly $107,000 in overdraft-related fees once the correction went through.
Peer-to-Peer Apps Work Differently
Traditional bank transfers have built-in reversal mechanisms. Peer-to-peer apps like Venmo, Zelle, and Cash App generally don’t. Most P2P platforms treat person-to-person transfers as final. Venmo’s purchase protection, for example, only covers eligible transactions tied to business profiles, debit card purchases, or payments tagged as goods and services. A standard transfer between two individuals isn’t covered.7Venmo. Venmo Purchase Protection – Buyers and Sellers
That gap is exactly what scammers exploit. If a stranger sends you money on a payment app and asks for it back, contact the app’s support team and let the platform handle the reversal through its own dispute process. Sending a new payment back creates a second transaction you may never recover if the original turns out to be fraudulent. The same rule applies when a mistaken payment comes from someone you actually know: route the return through the app’s refund process, not a fresh transfer.
Will You Owe Tax on It?
Money you give back isn’t taxable income. Income requires an actual gain, and a mistaken deposit you report and return never becomes your “undisputed possession” under IRS rules.8Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income
Payment apps add a wrinkle. If the mistaken payment came through Venmo, PayPal, or Cash App, the platform may issue you a Form 1099-K reporting the transaction as income. Contact the platform right away to request a corrected form; the issuer’s name and phone number are in the upper left corner of the 1099-K. If a corrected form doesn’t arrive before you file, the IRS allows you to report the amount on Schedule 1 (Form 1040), Line 8z as “Other Income – Form 1099-K Received in Error,” then enter the same amount on Line 24z as an offsetting adjustment, so the two cancel out.9Internal Revenue Service. Actions to Take if a Form 1099-K Is Received in Error or With Incorrect Information Keep records showing the payment was a mistake and was returned.
Can the Sender Still Come After You Later?
Time doesn’t erase the sender’s right to recover the money. Civil claims for unjust enrichment or restitution carry statutes of limitations that typically run two to five years, depending on the state and how the claim is framed; in some states a quasi-contract claim can run six years. Banks usually act faster than individual senders because of automated error detection, but even after the ACH reversal window closes, the sender can sue you directly. If the amount is large enough to justify hiring a lawyer, someone will eventually come looking for it.