Sales Tax Calculator

A retail sales tax is a single-stage consumption tax collected by the seller at the point of final sale and remitted to a state or local revenue department. Because it is levied only at the last stage rather than at each step of production, one multiplication is enough: tax equals the pre-tax price times the rate divided by 100, and the total is price plus tax. The rate a shopper actually pays is nearly always a combined rate - a state rate plus county, city, and special district add-ons. California has the highest statewide base rate at 7.25 percent, combined averages in Louisiana and Tennessee run above 9.5 percent, and five states - Alaska, Delaware, Montana, New Hampshire, and Oregon - levy no statewide sales tax. The difficulty lies in the tax base and in sourcing, not the arithmetic. Most states exempt unprepared groceries and prescription drugs, many tax restaurant meals at a higher combined rate, and clothing exemptions vary by state and by price threshold, so applying one flat rate to a mixed basket overstates the tax. Sourcing rules matter as well: destination-sourced states apply the rate at the buyer delivery address while origin-sourced states use the seller location, meaning an online order and an in-store purchase of the same item can differ. Rounding conventions also vary, with most jurisdictions computing tax on the whole invoice rather than line by line, which can shift the result by a cent.

General retail sales taxation is a Depression-era American invention. Mississippi enacted the first broad-based retail sales tax in 1932, at 2 percent, after property tax collections collapsed and the state needed revenue that did not depend on land values. The design spread quickly: by 1940 roughly two dozen states had adopted some form of retail sales tax, and in 1969 Vermont became the last state to add one. Local option taxes layered on top from the 1940s onward, first in places such as New York City and California, producing the patchwork of thousands of distinct combined rates that exists today. Enforcement against remote sellers evolved separately. In National Bellas Hess (1967) and Quill Corp. v. North Dakota (1992) the Supreme Court held that a state could not compel a seller with no physical presence to collect its tax, which left catalog and then internet purchases largely uncollected in practice. That rule ended with South Dakota v. Wayfair in June 2018, when the Court permitted economic nexus standards based on sales volume or transaction counts; every state with a sales tax now sets such a threshold. A parallel lineage runs through Europe, where Maurice Laure introduced the value-added tax in France in 1954, taxing each production stage with credits rather than imposing a single retail levy.