How Checks Work: Validity, Endorsements, and Fraud Risks

A check is a written order telling your bank to pay a specific amount from your account to the person or business named on it. Understanding how checks work means knowing what fields make one legally valid, how the money actually moves after a deposit, when those funds become spendable, and where the fraud risks sit. Federal law requires that the first $275 of most check deposits be available by the next business day, with the rest typically clearing within two business days.¹ But “available” is not the same as “cleared,” and that gap is where a lot of trouble starts.

What Makes a Check Legally Valid

A check becomes a negotiable instrument, meaning it can be transferred and enforced like a contract, when it meets the requirements set out in Article 3 of the Uniform Commercial Code.² In practice, that means filling in a handful of fields correctly.

The date. Usually the current date, though post-dating is possible with limits described below.
The payee. The person or business being paid.
The numerical amount, written in the small box (for example, “$1,500.00”).
The written amount, spelled out on the line below (“One thousand five hundred and 00/100”). If the two amounts disagree, the written words control.³
Your signature, which authorizes the bank to release the funds. Without it, the bank will reject the check outright.

The memo line is optional and carries no legal weight. Every other field matters. An unsigned check is worthless, and a check made out to the wrong name can trigger delays or disputes that take weeks to untangle.

The machine-readable line at the bottom of the check does the real work of routing the payment. Printed in magnetic ink, it contains three numbers from left to right: a nine-digit routing number identifying the bank, the account number, and the serial number of that specific check.⁴

What Happens After You Deposit One

When you deposit a check, your bank captures a digital image of the front and back. Under the Check Clearing for the 21st Century Act, banks no longer need to physically transport paper checks. The digital image and payment data travel electronically to a clearinghouse or the Federal Reserve, which routes the request to the paying bank.⁵ If any bank in the chain still needs a paper copy, the image can be used to create a “substitute check” that is legally equivalent to the original.⁶

Check 21 is also what makes mobile deposit possible. The same image-capture technology banks use internally is what your phone’s camera does when you take a picture of a check through your banking app.

When Your Funds Become Available

Regulation CC sets the maximum time your bank can hold deposited funds before letting you spend them. As of July 1, 2025, three thresholds matter.⁷

The first $275 of any check deposit must be available by the next business day.¹
The remainder of a standard check deposit is generally available within two business days. Since the Federal Reserve consolidated its processing regions in 2010, the old distinction between “local” and “nonlocal” checks effectively disappeared, and nearly all checks follow this schedule.⁸
Banks can hold funds up to five business days on deposits exceeding $6,725 in a single day, but only on the amount above that threshold. New accounts, repeated overdrafts, and reasonable doubt about collectibility can also trigger extended holds.

A critical point that trips people up: funds becoming “available” does not mean the check has fully cleared. Your bank gives you access based on the regulatory schedule, but the paying bank might still bounce the check days or even weeks later. If that happens, your bank will pull the money back from your account, and you are on the hook for anything already spent.

Endorsing a Check You Received

Before you can deposit or cash a check made out to you, you endorse it by signing the back. How you sign controls who else can handle the check.

A blank endorsement is just your signature. It turns the check into a bearer instrument, meaning anyone holding it can cash or deposit it. Convenient, but risky if the check is lost or stolen.⁹
A special endorsement adds “Pay to the order of [Name]” above your signature. That restricts negotiation to the named person, who must then endorse it themselves.
A restrictive endorsement adds “For deposit only” and your account number. This is the safest option for mailed deposits or ATMs because it locks the check to your account.¹⁰

If you receive a check and are not depositing it right away, hold off on endorsing. A blank-endorsed check in your glove compartment is the same as cash to anyone who finds it.

The Different Kinds of Checks

Not every check carries the same risk for the person accepting it. The difference is who guarantees the funds.

A personal check is drawn against your checking account. The bank makes no promise that the money is actually there, so these carry the most risk for the recipient. If your balance is short when the check hits, it bounces.
A cashier’s check is drawn on the bank’s own funds after you pay the amount upfront, plus a fee that typically runs around $10. Because the bank itself backs the payment, cashier’s checks are treated as near-guaranteed funds. Landlords, car dealerships, and title companies often require them for large transactions.
A certified check is written by you, but the bank stamps it as certified after verifying and setting aside the funds in your account. The money is earmarked and cannot be spent on something else before the check clears.
A money order is a prepaid instrument available from banks, post offices, and retail stores, usually for amounts under $1,000. Useful when you do not have a checking account or need a guaranteed payment for a smaller transaction.

Stale-Dated and Post-Dated Checks

Checks do not last forever. A bank is under no obligation to honor a check presented more than six months after its date.¹¹ That is not the same as “will refuse.” A bank can still pay a stale check in good faith and charge it against the writer’s account. If you have an old check in a drawer, contact the writer and ask for a replacement rather than gambling.

Post-dated checks are legal to write, but they do not work the way most people assume. Your bank can process a post-dated check before its stated date unless you have given the bank advance notice not to. That notice must describe the check with enough detail for the bank to identify it, and an oral notice expires after 14 calendar days unless confirmed in writing. Even a written notice lasts only six months before it needs to be renewed.¹²

Stopping Payment

You can stop payment on any check you have written, as long as the bank receives your order before it has processed the payment. An oral stop-payment order expires after 14 days unless confirmed in writing, and a written order lasts six months. You can renew for additional six-month periods, but only before the current order lapses.¹²

Banks typically charge $15 to $36 for a stop-payment order, with online requests sometimes cheaper than phone or branch requests. Stopping payment does not erase the underlying debt. If you owe someone money and stop the check, they can still come after you for the amount owed. Stop payments are best used when a check is lost, stolen, or issued in error.

Fraud Risks to Know About

Checks are the payment method most frequently targeted by fraud. According to a 2025 survey by the Association of Financial Professionals, 63 percent of organizations experienced attempted or actual check fraud in 2024.¹³ Two categories drive most of the losses.

Check Washing and Mail Theft

Thieves steal checks from mailboxes, then use chemicals to dissolve the ink and rewrite the check to themselves for a larger amount. In just six months of 2023, the Treasury Department’s Financial Crimes Enforcement Network received over 15,000 reports of mail-related check fraud involving more than $688 million in transactions.¹³ To reduce risk, use gel ink pens, which soak into the paper and resist chemical removal better than ballpoint ink. Fill in every field completely so there is no blank space to exploit. And drop envelopes containing checks inside the post office rather than leaving them in a residential or blue collection box.

Counterfeit Check Scams

The pattern is predictable: someone sends you a check, you deposit it, and they ask you to wire part of the money back or forward it to a third party. By the time the check bounces, the wire transfer is gone and you are liable for the full amount. The FTC has reported that fake check scams carry median individual losses of nearly $2,000, and more than half involve fake job offers or income opportunities.¹⁴ Common versions include mystery shopper payments, car-wrap advertising gigs, and overpayment on items sold online.

The core rule: never wire money or send gift cards to someone who paid you with a check you were not expecting. Funds appearing in your account do not mean the check was real. Your bank gave you provisional access under the Regulation CC timeline, not a guarantee.

Reporting Unauthorized Transactions

If a forged or altered check appears on your account, timing matters. Under the Uniform Commercial Code, you generally have one year from when your bank statement becomes available to report an unauthorized signature or alteration. But that outer deadline is misleading. If you fail to report the first forged check promptly, you can be held responsible for later forgeries by the same person on any check your bank pays more than 30 days after your statement was available. Reviewing your statements monthly is the single most effective protection against ongoing fraud.

1
eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks (Regulation CC)
2
Cornell Law School. Uniform Commercial Code 3-104 – Negotiable Instrument
3
Cornell Law School. Uniform Commercial Code 3-114 – Contradictory Terms of Instrument
4
American Bankers Association. ABA Routing Number
5
Federal Reserve Board. Frequently Asked Questions About Check 21
6
Federal Reserve. Check Clearing for the 21st Century Act
7
Consumer Financial Protection Bureau. Availability of Funds and Collection of Checks (Regulation CC) Threshold Adjustments
8
FDIC. Expedited Funds Availability Act
9
Cornell Law School. Uniform Commercial Code 3-205 – Special Indorsement; Blank Indorsement; Anomalous Indorsement
10
Cornell Law School. Uniform Commercial Code 3-206 – Restrictive Indorsement
11
Cornell Law School. Uniform Commercial Code 4-404 – Bank Not Obliged to Pay Check More Than Six Months Old
12
Cornell Law School. Uniform Commercial Code 4-403 – Customer’s Right to Stop Payment; Burden of Proof of Loss
13
Federal Reserve. Responding to Counterfeit Instrument Scams and Mail-Related Check Fraud
14
Federal Trade Commission. Fake Check Scams Cause Big Losses