US Sales Tax Calculator

What Is Sales Tax?

Sales tax is a consumption tax levied by state and local governments in the United States on the retail sale of goods and certain services. Unlike income tax, which is based on what you earn, sales tax is based on what you spend. The tax is calculated as a percentage of the purchase price and added at the point of sale. The merchant collects the tax from the buyer and remits it to the appropriate government authority.

The United States is one of the few developed countries that does not have a national sales tax or value-added tax (VAT). Instead, sales tax is administered at the state and local level, creating a patchwork of rates and rules across the country. This means the total sales tax you pay depends entirely on where the purchase is made, not where you live (with some exceptions for online purchases).

How US Sales Tax Works: State + Local

US sales tax has two layers. The state sales tax is a uniform rate set by the state legislature. The local sales tax consists of additional rates imposed by counties, cities, transit districts, or other special taxing jurisdictions. These local rates stack on top of the state rate to form the combined rate.

For example, if you buy a $100 item in a location with a 6% state rate and a 2% local rate, the total tax is $8.00 (8% combined), making the total price $108.00. The formula is straightforward:

To reverse-calculate (find the pre-tax price from a tax-inclusive amount):

States With No Sales Tax

Five states impose no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. However, there are nuances. Alaska has no state sales tax but allows municipalities to levy local sales taxes, so certain cities like Juneau (5%) and Kodiak (7%) do collect sales tax. The other four states have no state or local sales tax whatsoever.

Living in or shopping in a no-sales-tax state can mean significant savings on large purchases. A $30,000 car purchase in a state with 7% sales tax would cost an extra $2,100 in tax. These states often rely more heavily on property taxes, income taxes, or other revenue sources to compensate for the lack of sales tax revenue.

Highest and Lowest Sales Tax States

Among states that impose sales tax, the rates vary considerably. California has the highest state-level rate at 7.25%, followed by Indiana, Mississippi, Rhode Island, and Tennessee tied at 7%. At the other end, Colorado has the lowest state rate at 2.9%.

However, the state rate alone does not tell the full story. When local taxes are included, the picture shifts. Tennessee, Louisiana, and Arkansas frequently have the highest combined rates in the country, often exceeding 9-10% in certain jurisdictions. States with low state rates but high local rates (like Alabama, with a 4% state rate but local rates up to 7.5%) can end up with surprisingly high combined totals.

Online Sales Tax: The Wayfair Decision

Prior to 2018, online retailers were only required to collect sales tax in states where they had a physical presence (a store, warehouse, or employees). This changed with the landmark South Dakota v. Wayfair, Inc. Supreme Court ruling in June 2018. The court ruled that states can require out-of-state sellers to collect sales tax based on their economic activity in the state, even without physical presence.

Most states now have economic nexus laws with common thresholds of $100,000 in sales or 200 transactions within the state. Major online platforms like Amazon, eBay, and Walmart already collect and remit sales tax on behalf of their marketplace sellers in most states. If an online retailer does not collect the tax, the buyer is legally required to self-report and pay "use tax" on their state tax return, though compliance with this requirement has historically been very low.

Sales Tax vs. VAT: Key Differences

The US sales tax system differs fundamentally from the Value Added Tax (VAT) used in approximately 170 countries worldwide. VAT is collected at every stage of the supply chain (manufacturer, wholesaler, retailer), with each business paying tax on the value it adds and claiming credits for VAT paid on inputs. Sales tax is collected only once, at the final retail sale.

Another key difference is pricing. In VAT countries, the listed price typically includes the tax (tax-inclusive pricing), so a price tag of EUR 100 already contains the VAT. In the US, listed prices exclude sales tax, so a $100 price tag means you will pay $100 plus tax at checkout. This can surprise international visitors who are accustomed to what-you-see-is-what-you-pay pricing.

Tax-Exempt Items by State

States vary widely in what they exempt from sales tax. Understanding exemptions can help you plan significant purchases. Here are the most common categories:

Groceries: About 30 states fully exempt grocery items (unprepared food) from sales tax. States like Alabama, Mississippi, and South Dakota tax groceries at the full rate. Some states like Arkansas, Illinois, and Missouri apply a reduced rate to groceries.

Clothing: Most states tax clothing, but a few provide full exemptions. Pennsylvania exempts most clothing and footwear. New Jersey exempts clothing. Minnesota exempts clothing. New York exempts clothing and footwear under $110 per item. Massachusetts exempts clothing under $175 per item.

Prescription medications: Nearly all states exempt prescription drugs from sales tax. Illinois is the only state that taxes prescription drugs, though at a reduced rate of 1%.

Sales tax holidays: Many states offer annual tax-free shopping periods, typically in late summer for back-to-school shopping. Items like clothing, school supplies, and computers may be exempt during these periods. States with popular sales tax holidays include Texas, Florida, and Tennessee.

Worked Example: Purchasing a $1,500 Laptop

Let us compare the total cost of buying a $1,500 laptop in different locations to illustrate how sales tax affects your purchase:

The difference between buying in Portland (no sales tax) and Los Angeles (10.25% combined) is $153.75 on a $1,500 purchase. For very large purchases like vehicles, furniture, or electronics, shopping across state lines or online can yield meaningful savings, though you may still owe use tax in your home state.

Tips for Managing Sales Tax

1. Know Your Local Combined Rate

Many people know their state rate but forget about local additions. City, county, and special district taxes can add 1-5% or more on top of the state rate. Look up your exact combined rate on your state's department of revenue website to avoid surprises on large purchases.

2. Take Advantage of Tax Holidays

If your state offers sales tax holidays, plan major purchases accordingly. Buying $500 worth of school clothes and supplies during a tax-free weekend in a state with 7% sales tax saves $35. The savings compound when purchasing expensive items like computers, which some states include in their holiday exemptions.

3. Business Resale Exemptions

If you purchase items for resale in your business, you can often obtain a resale certificate that exempts those purchases from sales tax. The end consumer pays the tax when you sell the finished product or resold item. This prevents double taxation in the supply chain. Contact your state's tax authority for resale certificate requirements.