The shelf tag says $4.99. The register says $6.49. When you point it out, the cashier shrugs: the tag must be old, the system is right, take it or leave it. Every shopper has been there, and most walk away wondering the same thing: is the store allowed to do that?
The honest answer is layered. There is no general federal law that forces a store to sell an item at a mistagged price. But that is the beginning of the story, not the end, because deception law, state pricing statutes, weights-and-measures inspectors, and the stores’ own posted policies all bend the situation back in your favor more often than that cashier’s shrug suggests.
The baseline: a price tag is usually not a contract
Under longstanding contract principles followed in most states, a posted price is treated as an invitation to make an offer, not a binding offer itself. You offer to buy at the register; the store accepts or declines. So a genuine, one-off tagging mistake, the $49 television that was supposed to say $499, generally does not obligate the store to sell at the error price, whether the mistake is on a shelf tag or a website.
That surprises people, but it cuts both ways: it is also why a store can honor a mistake as goodwill without setting a legal precedent. Which many do, and we will get to that.
When a wrong price becomes illegal deception
The law stops being forgiving when wrong prices stop being accidents. The Federal Trade Commission’s Guides Against Deceptive Pricing target phony “former price” comparisons and markdowns that never existed, and its Guides Against Bait Advertising condemn advertising a price the seller never intends to honor in order to pull customers in and switch them to something costlier.
A store that systematically posts low shelf prices and scans high is not making a mistake; it is running a pattern, and patterns are what the FTC Act and every state’s consumer protection law prohibit as deceptive practices. The distinction to keep in mind at the counter: one wrong tag is an error, but the same wrong tag on your third visit is evidence.
Scanner accuracy is actually inspected
Here is the enforcement layer most shoppers never see. Price scanner accuracy is checked by state and local weights-and-measures offices, the same officials who certify gas pumps and deli scales. They conduct spot inspections comparing shelf prices to register prices, using model procedures published by the National Institute of Standards and Technology’s Office of Weights and Measures, and stores with high error rates can face fines.
That means a store with chronically mismatched tags is not just annoying you; it is failing a test a government inspector actually administers. Reporting a pattern to your state or county weights-and-measures office is a concrete step, and those complaints drive where inspectors go next.
Some states and stores go further
A number of states have pricing accuracy laws that give shoppers more than the federal baseline, in some cases requiring stores to honor the lower posted price, and in a few, paying the customer a bonus when the scanner overcharges. The details vary widely by state, so it is worth two minutes to look up your own rules through your state consumer protection office, which you can find via USA.gov’s state consumer directory.
On top of state law, many major chains maintain their own scan-accuracy policies, often posted at the service desk, promising the item free or at the shelf price if the register rings higher. Employees do not always volunteer these policies, but they generally honor them when asked directly.
How to handle it at the register
A calm process wins this argument far more often than indignation. Before you leave the aisle, photograph the shelf tag, including the product name and size printed on it, since tags placed under the wrong product are the most common source of genuine disputes. At the register, point out the difference and ask for the shelf price. If the cashier cannot adjust it, ask for a manager and, where applicable, mention the store’s own scan policy.
If the store still refuses on a legitimate mismatch, you have choices: decline the item (the simplest lever there is), or complete the purchase, keep the receipt with your photo, and pursue it afterward with the chain’s customer service, which frequently refunds the difference without a fight.
When to escalate
Save escalation for patterns and bad faith, and then actually use it. Report chronic tag-versus-scanner mismatches to your weights-and-measures office. Report bait pricing and phantom discounts to your state attorney general and to the FTC at ReportFraud.ftc.gov. Include your photos, receipts, and dates; three documented visits beat thirty angry adjectives.
Most price disputes end quietly with the store honoring the tag, because the goodwill math is easy: no retailer wants to lose a regular customer, an inspector’s attention, and a $1.50 argument all at once. Know the baseline, know your state’s rules, and bring a photo. The shrug at the register is rarely the store’s final answer.
