A bank note is a piece of physical currency issued by a nation’s central bank — a government-backed promise that the paper in your hand carries the purchasing power printed on its face. In the United States, every bill in circulation is a Federal Reserve Note, and federal law designates it legal tender for all debts. The paper itself costs pennies to produce; its value comes from the government’s declaration that it is money and from everyone’s willingness to treat it that way.
Where the Value Comes From
At its legal roots, a bank note is a type of promissory note: an unconditional written promise to pay the bearer a specified amount. Historically that promise was literal, and you could exchange a note at a bank for a set weight of gold or silver. The United States phased out that commodity link during the twentieth century, and today’s Federal Reserve Notes are pure fiat currency. Their value comes not from any metal in a vault but from the federal government’s declaration that they are money.
A $20 bill costs the government roughly 7.3 cents to print, covering specialized paper, ink, and labor.1Board of Governors of the Federal Reserve System. How Much Does It Cost to Produce Currency and Coin? The remaining $19.93 of value exists because the law says it does and because every store, bank, and person in the country agrees.
On the Federal Reserve’s own books, every note in circulation shows up as a liability. Federal Reserve Notes are the largest category of liabilities on the central bank’s balance sheet.2Board of Governors of the Federal Reserve System. Federal Reserve Liabilities In practice, that means each note is a non-interest-bearing claim against the Fed with no maturity date. The only thing the government promises is that you can exchange one denomination for equivalent denominations, such as five $20 bills for a $100. No gold, no silver, no redemption for anything other than more legal tender.
Who Issues U.S. Bank Notes
The Federal Reserve System controls the issuance of all U.S. bank notes. The Federal Reserve Act authorizes the Board of Governors to issue Federal Reserve Notes, which the law designates as “obligations of the United States.”3Board of Governors of the Federal Reserve System. Federal Reserve Act Section 16 – Note Issues The physical printing happens at the Bureau of Engraving and Printing, which operates under the Department of the Treasury.4Bureau of Engraving and Printing. The Buck Starts Here: How Money is Made
Seven denominations are currently produced: $1, $2, $5, $10, $20, $50, and $100. Larger denominations like the $500 and $1,000 bill were last printed decades ago but remain legal tender. Any design of U.S. currency ever issued is still valid if you happen to hold one.5U.S. Currency Education Program. The Seven Denominations In practice, those old large-denomination notes are worth far more to collectors than their face value.
What Legal Tender Actually Means
Federal law states that U.S. coins and currency, including Federal Reserve Notes, “are legal tender for all debts, public charges, taxes, and dues.”6Office of the Law Revision Counsel. 31 USC 5103 Legal Tender If you owe someone money — a loan payment, a court judgment, a tax bill — they cannot refuse payment in cash. Tendering the full amount in currency satisfies the debt as a matter of law, even if the creditor would have preferred a check or wire transfer.
The part that surprises most people: legal tender status does not force every business to take your cash for a new purchase. No federal statute requires a private business to accept paper currency for goods or services.7Board of Governors of the Federal Reserve System. Is It Legal for a Business in the United States to Refuse Cash as a Form of Payment? A coffee shop with a “card only” sign is legal under federal law, because you have no pre-existing debt when you walk up to the counter. The obligation has not been created yet, so the legal tender mandate doesn’t apply. Several states and cities have passed their own laws requiring businesses to accept cash, but the federal rule draws a hard line between settling a debt and making a new purchase.
How to Tell a Real Bill from a Counterfeit
U.S. currency is printed on a distinctive blend of 75% cotton and 25% linen, manufactured exclusively for the Bureau of Engraving and Printing. Tiny red and blue synthetic fibers are distributed randomly throughout the paper, and possessing this substrate is illegal for anyone other than the BEP.4Bureau of Engraving and Printing. The Buck Starts Here: How Money is Made The paper feels different immediately to anyone who handles cash regularly.
Beyond the paper itself, each denomination carries layered security features designed so anyone can verify authenticity quickly:
- Security thread. Every genuine note from the $5 up has a plastic strip embedded vertically in the paper, inscribed with the denomination and visible when held to light. Each denomination’s thread sits in a different position and glows a different color under ultraviolet light.8United States Secret Service. Know Your Money
- Watermark. A faint image, usually matching the portrait on the bill, becomes visible when the note is held up to light. Like the security thread, it is embedded in the paper rather than printed on the surface.
- Color-shifting ink. On $10, $20, $50, and $100 bills, the numeral in the lower right corner shifts from copper to green when tilted at an angle.8United States Secret Service. Know Your Money
- 3-D security ribbon. Found only on the $100 bill, this blue ribbon is woven into the paper and displays images of bells and the number 100 that shift as you tilt the note. Because it is woven rather than printed, it cannot be replicated with a standard printer.
- Microprinting. Tiny text placed in various locations on the note requires magnification to read. Photocopiers and consumer printers cannot reproduce text this small with any clarity.
These features work in combination. A counterfeit might replicate one or two, but reproducing all of them on the correct substrate is extraordinarily difficult. Holding a bill to light to check the watermark and security thread catches most fakes in seconds.
What Happens if You End Up with a Counterfeit
Manufacturing counterfeit U.S. currency is a federal crime punishable by up to 20 years in prison, a fine, or both.9Office of the Law Revision Counsel. 18 USC 471 Obligations or Securities of United States The same maximum penalty applies to anyone who knowingly passes, possesses, or conceals counterfeit currency with intent to defraud.10Office of the Law Revision Counsel. 18 USC 472 – Uttering Counterfeit Obligations or Securities If you knowingly try to spend a fake $50 bill, you face the same potential sentence as the person who printed it.
If you discover or suspect a counterfeit bill in your possession, the Secret Service instructs individuals to submit it to their local police department, which then forwards it for investigation. Banks and cash processors follow the same chain, routing suspected notes to the Secret Service.11United States Secret Service. Counterfeit Investigations One detail that catches people off guard: you will not be reimbursed. If you unknowingly accepted a counterfeit bill and it gets identified later, that loss falls on you.
Damaged and Mutilated Bills
Bank notes get damaged. They go through the wash, survive house fires, or get chewed up by a pet. When a note is too damaged for a bank to process normally, the Bureau of Engraving and Printing operates a free redemption service. The BEP defines “mutilated” currency as a note where half or less of the original remains, or where damage is severe enough that the value is questionable.12Bureau of Engraving & Printing. Mutilated Currency Redemption
The rules are straightforward. If clearly more than 50% of a note remains along with identifiable security features, the BEP pays full face value. If 50% or less remains, the BEP will still pay full value, but only if the evidence demonstrates that the missing portion was completely destroyed, for example in a documented fire.12Bureau of Engraving & Printing. Mutilated Currency Redemption Send in half a bill without proof the other half was destroyed and the BEP will refuse the claim. Otherwise someone could tear a note in half and submit both halves separately for double the face value.
When Cash Triggers Federal Reporting
Using large amounts of physical cash triggers reporting obligations that do not apply to checks or electronic transfers. Any business that receives more than $10,000 in cash from a single transaction, or from two or more related transactions, must file IRS Form 8300.13Internal Revenue Service. About Form 8300, Report of Cash Payments Over $10,000 Received in a Trade or Business This applies to car dealers, jewelers, real estate agents, and essentially any business involved in a high-value cash sale.
The $10,000 threshold also applies at banks, which file separate Currency Transaction Reports for large cash deposits or withdrawals. Deliberately breaking a transaction into smaller amounts to avoid these reporting thresholds, known as structuring, is itself a federal crime, even if the underlying money is completely legitimate. If you are making a large cash purchase or deposit, complete the transaction normally and let the business or bank file whatever reports the law requires.
Bank Notes and the Digital Dollar Question
Federal Reserve Notes remain the only form of central bank money available to the general public. The Federal Reserve has studied the possibility of a Central Bank Digital Currency, defined as “a digital liability of a central bank that is widely available to the general public,” which would be functionally similar to a bank note without the physical paper.14Federal Reserve Board. Central Bank Digital Currency (CBDC)
Whether the United States moves forward with a digital dollar remains an open policy question. The key distinction is worth holding onto: the cash in your wallet is a direct claim on the central bank, while the balance in your checking account is a claim on your commercial bank, which in turn holds reserves at the Fed. That difference rarely matters in daily life, but it becomes very relevant during a bank failure.