Does a store have to honor a mismarked price? Usually no. A shelf tag, sign, or ad is not a binding offer under general contract law, so a cashier can correct the price when the item scans higher and you can either pay the corrected amount or walk away. That default flips in two situations: once you’ve completed the purchase, and in states whose pricing accuracy laws require the retailer to charge the lower displayed price.
Why the Shelf Tag Isn’t a Binding Offer
Courts treat advertisements and displayed prices as invitations for you to make an offer, not offers the store has to accept.1University of Missouri School of Law. Can an Advertisement Create a Binding Contract When you carry an item to the register, you are the one offering to buy it at the price you saw. The store accepts by taking your money and handing over the goods. Until that exchange happens, either side can back out. If the register shows a higher price, the store is effectively declining your offer and proposing a new one, and you’re free to decline right back.
The practical reason for this rule is straightforward. If every price tag were a binding commitment, a mismarked sticker or a typo in a weekly flyer would create thousands of contracts a store couldn’t possibly honor. So the law puts the moment of contract at the register, not on the shelf.
Once You’ve Paid, the Price Is the Price
The moment payment goes through and you take possession, a contract exists at the price you paid. The store can’t chase you into the parking lot for more, and it can’t retroactively run your card for the difference. Most pricing disputes actually resolve here without any special law being involved: if the wrong price made it all the way through checkout, you paid what you paid.
Things get murkier when a retailer takes payment before delivery, as furniture and appliance sellers often do. If the store spots the error before the item leaves the warehouse, it may try to cancel the order and refund you. Whether that holds up depends largely on the next point.
The Obvious-Error Exception
Courts won’t force a store to honor a price so wrong that no reasonable shopper could have believed it. This is the doctrine of unilateral mistake: one side made an error, the other side knew or should have known, and enforcing the “deal” would be unfair. A $2,500 laptop tagged at $25 is the textbook example.
The test isn’t whether you personally spotted the mistake but whether a reasonable person in your position would have. A television marked $399 instead of $449 looks like an ordinary sale, and a store would struggle to call it obvious. That same television marked $4.49 is a different conversation. The wider the gap between the tag and the item’s known market value, the more likely a court sides with the retailer.
State Laws That Force the Lower Price
This is where consumers actually gain leverage. Several states have pricing accuracy statutes that override the contract-law default and require retailers to charge the lowest displayed price.
Item Pricing Laws
Eight states require some form of mandatory price marking on individual items: Arizona, California, Connecticut, Massachusetts, Michigan, New Hampshire, New Mexico, and New York, where the requirements vary by county.2National Institute of Standards and Technology. A Guide to U.S. Retail Pricing Laws and Regulations In these states, the sticker on the item carries legal weight. If it reads $3.99 and the scanner reads $4.99, the store generally has to honor $3.99.
Scanner Accuracy Enforcement
Many states run scanner accuracy audits through their weights and measures departments, using a standard developed by the National Conference on Weights and Measures.3Federal Trade Commission. A Report on the Accuracy of Checkout Scanners Stores that repeatedly fail face fines and more frequent inspections, which is why most large chains train cashiers to honor the shelf price on the spot rather than argue.
Scanner Error Bounties
A handful of states go further and require the store to pay you a small bonus when you catch an overcharge. The bounty may be a fixed dollar amount or a multiple of the price difference, and the store also has to give you the item at the lower price. Even in states without a bounty statute, many national retailers keep a similar voluntary policy to avoid customer complaints and regulator attention.
Because these laws vary so widely, the specific rule that applies to you depends on your state and, in New York, your county. Your state attorney general’s consumer protection page is the fastest way to see whether an item pricing law, scanner accuracy law, or bounty provision covers your situation.
Online Orders
Online retailers have an extra layer of protection the corner store doesn’t: their terms of service. Nearly every major e-commerce site reserves the right to cancel orders placed at incorrect prices, and courts have generally allowed sellers to rescind those orders when the error was clearly wrong to a reasonable shopper and the buyer hasn’t been harmed beyond losing the bargain.
Timing still matters. If the retailer catches the mistake before shipping, cancellation is easy. Once the item has been shipped and delivered, the retailer’s position weakens, because a completed sale is much harder to unwind. Some sellers honor delivered orders as a goodwill gesture even when they don’t have to.
A Note on Advertised Grocery Deals
A separate federal rule covers grocery ads specifically. Under 16 CFR Part 424, retail food stores that advertise a product at a stated price must have it in stock during the ad period, or offer a rain check, a comparable substitute at the same discount, or other compensation of equal value. If the store doesn’t intend to offer rain checks, the ad has to say supplies are limited.4eCFR. 16 CFR Part 424 – Retail Food Store Advertising and Marketing Practices5Federal Trade Commission. Retail Food Store Advertising and Marketing Practices (Unavailability Rule) This rule targets advertised items that aren’t stocked, not shelf-tag typos, but it’s the reason grocery stores tend to be generous about honoring flyer prices.
What to Do at the Register
Before you head to checkout, photograph the shelf tag or sign. If the item rings up higher, show the cashier your photo and ask them to match the displayed price. Cashiers usually have override authority for small discrepancies, and most stores will honor the lower price as a matter of policy even where no law forces them to.
If the cashier can’t help, ask for a manager. Be specific: the item, the price you saw, the price it rang up. Managers have broader override authority and generally prefer to fix a $2 problem quickly rather than escalate it. Most in-store pricing disputes end here.
If the store refuses and you think your state’s law requires it to honor the price, file a complaint with your state attorney general’s office or your state or local consumer protection agency. Include the store name and location, the product, both prices, and your photo. These offices investigate patterns of overcharging, and even a complaint that doesn’t recover your own money contributes to the record that triggers an inspection.