Finance
Sales Tax Calculator: How to Calculate Tax in Any US State
Learn how sales tax works in the US, calculate reverse tax, and see current rates for all 50 states. Includes tax-free state list and examples.
Sales tax seems straightforward until you need to calculate the pre-tax price from a receipt, deal with combined state and local rates, or figure out why your online purchase was taxed differently. Here’s how sales tax actually works across the US and how to calculate it in any direction.
How Sales Tax Calculation Works
The basic sales tax formula is simple:
Tax Amount = Price × Tax Rate
Total Price = Price × (1 + Tax Rate)For a $49.99 item in Texas (6.25% state + 2% local = 8.25%):
- Tax: $49.99 × 0.0825 = $4.12
- Total: $49.99 + $4.12 = $54.11
Reverse calculation (finding the pre-tax price from the total):
Pre-tax Price = Total / (1 + Tax Rate)If your receipt shows $54.11 total at 8.25%:
- Pre-tax: $54.11 / 1.0825 = $49.99
This reverse formula is useful for expense reports, budgeting, and verifying receipts.
State Sales Tax Rates: Top 10 Highest Combined Rates
Combined rates include the maximum state + local taxes a consumer might encounter:
| State | State Rate | Max Local | Max Combined |
|---|---|---|---|
| Louisiana | 4.45% | 7.00% | 11.45% |
| Tennessee | 7.00% | 2.75% | 9.75% |
| Arkansas | 6.50% | 5.125% | 11.625% |
| Washington | 6.50% | 4.00% | 10.50% |
| Alabama | 4.00% | 7.50% | 11.50% |
| Oklahoma | 4.50% | 7.00% | 11.50% |
| Illinois | 6.25% | 4.75% | 11.00% |
| Kansas | 6.50% | 4.00% | 10.50% |
| California | 7.25% | 2.50% | 9.75% |
| New York | 4.00% | 4.875% | 8.875% |
Rates as of 2025. Local rates vary by city and county.
Tax-Free States and Exemptions
Five states charge no state sales tax at all:
- Oregon — No sales tax of any kind
- Montana — No sales tax (some resort areas charge local taxes)
- New Hampshire — No sales tax (meals and lodging taxed separately)
- Delaware — No sales tax
- Alaska — No state tax, but localities can charge up to 7.5%
Most states also exempt specific categories from sales tax. Common exemptions include groceries (32 states), prescription medications (all states), and clothing (select states like Pennsylvania, New Jersey, and Minnesota).
Practical Tips for Tax Calculations
For online purchases: Since the 2018 South Dakota v. Wayfair Supreme Court decision, most online retailers collect sales tax based on the buyer’s location, not the seller’s. Your rate is determined by your shipping address.
For businesses: If you’re calculating sales tax to charge customers, always use the rate for the delivery destination. Tax rates change frequently — over 800 rate changes happen annually across the US.
For budgeting: When estimating costs on big purchases, multiply by your local combined rate. For a $1,000 laptop in Chicago (10.25% combined): expect to pay $1,102.50 total.
Calculate instantly with our Sales Tax Calculator.
OurDailyCalc Team
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