Sales Tax Calculator

Unlike most developed countries that use a national value-added tax, the United States relies on a decentralized system of state and local sales taxes. There is no federal sales tax. Each of the 45 taxing states sets its own base rate, and counties, cities, and special purpose districts — transit authorities, tourism boards, sports facilities — can add further layers on top. The result is a patchwork of over 11,000 distinct tax jurisdictions, which is why a purchase in downtown Seattle carries a meaningfully different rate than one made at a suburban store 15 miles away in the same state.

Five states — Oregon, Montana, New Hampshire, Delaware, and Alaska — have no state-level sales tax. Alaska permits local taxes, so some Alaskan municipalities still apply rates up to 7% or more. The wide variance in combined rates across the country creates real differences in the cost of large purchases like electronics, appliances, and vehicles. For high-value items, the tax savings from buying across a state line can exceed the cost of travel.

The state rate is the floor — set by the state legislature and uniform across the entire state. Local taxes are added by counties, municipalities, and special taxing districts, and they vary dramatically even within a single county. For example, Illinois has a 6.25% state rate, but Chicago adds a combined city, county, and special district rate that pushes the effective combined rate to over 10.25% for most purchases within city limits. A buyer just across the city boundary in a suburb may pay only 8% or 9%.

Understanding this structure matters for business owners setting prices, consumers planning major purchases, and anyone comparing the after-tax cost of a product from different retailers in different locations. The combined rate column in this calculator — derived from your ZIP code — reflects the actual rate that applies to your specific location, not the state average that is often cited in news articles and comparison guides. State averages can understate what high-rate urban consumers actually pay by one to two percentage points.

Vehicle purchases are subject to special sales tax rules in most states, with the most significant being the trade-in deduction. When you trade in a vehicle to a dealership, most states allow you to subtract the trade-in value from the new vehicle's price before calculating sales tax. On a $35,000 purchase with a $12,000 trade-in, you pay tax on only $23,000 rather than $35,000 — a savings of $720 at a 6% rate, or over $1,000 at rates above 8.5%.

Not all states offer the trade-in deduction, and the rules differ for private-party sales versus dealer transactions. Documentation fees — the administrative charges dealers add for processing paperwork — may or may not be taxable depending on the state; some states explicitly exempt them, others tax them as part of the vehicle sale. The Vehicle mode in this calculator lets you model the exact taxable amount after trade-in, specify whether doc fees are taxable for your state, and see the complete tax bill before you sign anything at the dealership.

Most states create categories of exempt purchases to reduce the burden on essential goods and low-income households. Unprepared groceries are exempt from sales tax in about 30 states; prescription medications are exempt in almost every state; and certain medical devices, farm equipment, and manufacturing inputs receive exemptions in many jurisdictions. The definition of what qualifies as exempt can be surprisingly specific — a bakery item sold for immediate consumption may be taxable while the same item sold packaged for home use is not.

Tax holidays add a time-limited dimension to exemptions. Most commonly held in late July or August, back-to-school tax holidays suspend sales tax on clothing under a specific dollar threshold, school supplies, and sometimes computers for students. Hurricane preparedness holidays in southeastern states exempt generators, batteries, and storm shutters for a weekend. Florida holds a Freedom Week holiday exempting outdoor recreation items. If you are planning a significant purchase in an eligible category, timing it during a holiday can eliminate the entire tax on hundreds of dollars of spending.

The 2018 Supreme Court decision in South Dakota v. Wayfair transformed online sales tax collection. Previously, states could only require sales tax collection from retailers with a physical presence in the state. The Wayfair ruling allowed states to impose economic nexus rules, requiring any out-of-state seller exceeding a revenue or transaction threshold to collect and remit sales tax — typically $100,000 in annual sales or 200 transactions in the state.

As a result, most major online retailers now collect applicable state and local sales tax at checkout, making online and in-store prices directly comparable for tax purposes. For purchases from smaller retailers that do not collect sales tax, consumers are technically required to self-report and pay a use tax on their state tax return at the same rate as the local sales tax. Use tax compliance is widely under-reported by individuals, though businesses face more rigorous enforcement. If you are making large purchases from out-of-state sellers who are not collecting tax, factor in the potential use tax liability when comparing total costs.