How hiding sales tax changes what people buy

The price shoppers compare is the price they notice

At the shelf, shoppers make quick comparisons: one product looks cheaper than another, or a purchase seems to fit a budget. If the tag leaves out sales tax, the displayed number is lower than the amount eventually paid. Even when customers know tax will be added at checkout, they may not mentally add it to every item while deciding what to put in the cart.

Showing the tax-inclusive price changes that comparison at the moment it matters. The total cost is visible before the shopper chooses, so a product can seem less affordable—or less attractive next to alternatives—than it did with a lower, tax-free-looking tag.

Visibility can change demand without changing the tax

In the supermarket experiment, sales of cosmetics fell by 8% when the tax was included on price tags. The tax itself had not become larger; what changed was how clearly it appeared during the purchase decision. That distinction matters: consumers can know a cost exists in general yet respond less to it when it is separated from the price they use to compare options.

This is a form of price salience: how noticeable a cost is when someone is deciding. A tax added only at checkout is easier to overlook during that decision than one printed on the shelf label. The result shows why the way a price is presented can affect buying, even when the final amount due is no secret.