Why the Shelf Price and Receipt Total Differ
In most US stores, the shelf price does not include sales tax. Tax is calculated at checkout and added afterward, which is why the receipt total is higher than what you mentally added up in the aisle.
What the Register Is Doing
The register applies the combined local rate for that location to taxable items. Some categories, like groceries or prescription drugs, may be exempt depending on the state.
Why the Difference Can Surprise People
The tax rate can change from one city to the next. Two stores in the same metro area may have slightly different totals because the local add-on is different.
How to Check a Receipt
If the receipt shows the rate used, multiply the subtotal by that rate to verify the tax amount. If the subtotal is missing but the total is present, use our reverse sales tax calculator to split the total into original price and tax.