State-Level Sales Tax Rates
Each US state sets its own base sales tax rate. Here's a snapshot of how rates compare across the country:
States with No Sales Tax:
- Delaware (0%)
- New Hampshire (0%)
- Montana (0%)
- Oregon (0%)
Highest State Rates:
- California: 7.25% (state minimum)
- Tennessee: 7.00%
- Indiana: 7.00%
- Mississippi: 7.00%
Local Sales Tax: The Hidden Add-On
In addition to state rates, counties, cities, and special districts can add their own sales tax. This is why the combined rate varies widely within the same state:
Combined Rate Examples:
Los Angeles, CA: 9.50% (7.25% state + 2.25% local)
Chicago, IL: 10.25% (6.25% state + 4% local)
Seattle, WA: 10.25% (6.50% state + 3.75% local)
New York City: 8.875% (4% state + 4.875% local)
The highest combined rate: Some areas in Alabama, Louisiana, and Tennessee have combined rates exceeding 10%.
How to Calculate Sales Tax on Any Purchase
The formula is simple: Tax Amount = Price × (Tax Rate ÷ 100). Then add the tax to the price for your total.
Example:
You're buying a $500 laptop in Seattle, WA (10.25% combined rate):
- Tax = $500 × 0.1025 = $51.25
- Total = $500 + $51.25 = $551.25
Smart Shopping: Using Sales Tax to Your Advantage
- Cross-state shopping: If you live near a border with a lower-tax or no-tax state, consider big purchases there.
- Online purchases: Since the 2018 South Dakota v. Wayfair ruling, most online retailers collect sales tax, but rates may differ from in-store.
- Tax holidays: Many states offer temporary sales tax holidays for back-to-school shopping, energy-efficient appliances, or disaster preparedness items.
- Exempt items: Groceries, prescription medications, and clothing may be exempt or taxed at a reduced rate depending on your state.
Working Backward: Finding the Pre-Tax Price
If you know the total you paid but need the pre-tax amount (for expense reports or budgeting), divide the total by (1 + tax rate):
If your total receipt is $109.50 and the tax rate is 9.5%:
- Pre-tax = $109.50 ÷ 1.095 = $100.00
- Tax paid = $109.50 − $100.00 = $9.50
Key Takeaways for Smart Shopping
- Always factor in sales tax when budgeting for purchases
- Combined rates vary by location—use your ZIP code to find the exact rate
- Tax holidays and exemptions can save you money on specific purchases
- Online and in-store rates may differ—compare total cost, not just item price
Conclusion: Know Before You Shop
Sales tax is an unavoidable part of shopping in the US, but understanding how it works helps you plan your purchases, budget accurately, and potentially save money through strategic timing and location choices.
Use the free calculators on Calculate Central to quickly figure out tax on any purchase, compare prices across different locations, or work backward from a receipt total to find the pre-tax amount.