How Sales Tax Works
Sales tax is a consumption tax charged on the sale of goods and services. In the United States, sales tax is set by state and local governments, which is why rates vary significantly by location.
Sales Tax Formula
Total Price = Subtotal + Tax Amount
Example: $85.00 purchase with 7.5% tax
Tax Amount = $85.00 × (7.5 ÷ 100) = $85.00 × 0.075 = $6.38
Total Price = $85.00 + $6.38 = $91.38
Reverse Sales Tax Formula
To find the pre-tax price when you only know the total:
Example: $108.00 total with 8% tax
Pre-Tax Price = $108.00 ÷ (1 + 0.08) = $108.00 ÷ 1.08 = $100.00
Tax Amount = $108.00 − $100.00 = $8.00
US State Sales Tax Rates (2024)
State sales tax rates range from 0% to 7.25%. Note that many localities add additional taxes on top of state rates, so your actual rate may be higher. These are base state rates only.
States With No Sales Tax
*Alaska has no state tax but allows local sales taxes up to 7.5%
Highest State Rates
Common State Rates
Sales Tax vs VAT: Key Differences
| Feature | US Sales Tax | VAT (Europe/UK) |
|---|---|---|
| When applied | Final sale only | Each stage of production |
| Display | Added at checkout | Included in price |
| Rate consistency | Varies by location | National rate |
| Typical rates | 0% – 10% | 15% – 27% |
| Business recovery | Generally not recoverable | Input tax credits |
Common Sales Tax Exemptions
Many states exempt certain items from sales tax. Common exemptions include:
- Groceries: Most states exempt unprepared food. Some tax it at a reduced rate.
- Prescription medications: Exempt in most states.
- Clothing: Exempt in some states (PA, NJ, MN) or during tax holidays.
- Medical equipment: Often exempt or reduced rate.
- Manufacturing equipment: Many states exempt for business use.
Note: Exemptions vary significantly by state. Check your local tax authority for specific rules.
Frequently Asked Questions
How do I calculate sales tax?
Multiply the price by the tax rate as a decimal. For example, for a $100 item with 8% tax: $100 × 0.08 = $8 tax. Add the tax to get the total: $100 + $8 = $108.
What is the sales tax formula?
Tax Amount = Subtotal × (Tax Rate ÷ 100)
Total Price = Subtotal + Tax Amount
Reverse calculation: Subtotal = Total ÷ (1 + Tax Rate ÷ 100)
Which US states have no sales tax?
Five US states have no state sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. However, Alaska allows local jurisdictions to charge their own sales tax, so some Alaska cities do have sales tax.
What is the average US sales tax rate?
The average combined state and local sales tax rate in the US is approximately 6.6%. State rates range from 0% to 7.25% (California), with local taxes potentially adding 0-5% more. Some areas have combined rates exceeding 10%.
How do I calculate the pre-tax price from a total?
Divide the total by (1 + tax rate as decimal). For a $108 total with 8% tax: $108 ÷ 1.08 = $100 pre-tax price. The tax portion is $108 − $100 = $8.
Is sales tax included in listed prices in the US?
No. In the United States, sales tax is typically added at checkout and not included in listed shelf prices. This differs from most other countries where VAT or GST is included in displayed prices.
Do I pay sales tax on online purchases?
Yes. Since the 2018 Supreme Court ruling in South Dakota v. Wayfair, online retailers must collect sales tax in states where they have "economic nexus" (typically $100,000+ in sales or 200+ transactions). Most major online retailers now collect sales tax in all states that have it.
What is a sales tax holiday?
A sales tax holiday is a limited time period when certain items (usually school supplies, clothing, or emergency preparedness items) can be purchased tax-free. Many states offer these before the school year starts, typically in late July or August.
Why does sales tax vary so much in the US?
The US Constitution gives states the power to set their own tax policies. Additionally, counties, cities, and special districts can add their own sales taxes. This creates the patchwork of rates across the country, with over 11,000 different sales tax jurisdictions in the US.
Can businesses recover sales tax?
Unlike VAT systems, US sales tax generally cannot be recovered by businesses as input credits. However, businesses can often purchase items for resale without paying sales tax by providing a resale certificate to suppliers.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates for planning purposes and should not replace professional financial advice.
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Sales Tax Calculator FAQ
How do I calculate sales tax?
Multiply the price by the tax rate (as a decimal). For example, for a $100 item with 8% tax: $100 × 0.08 = $8 tax. The total is $100 + $8 = $108.
What is the sales tax formula?
Tax Amount = Subtotal × (Tax Rate ÷ 100). Total Price = Subtotal + Tax Amount. To reverse-calculate the subtotal from a total: Subtotal = Total ÷ (1 + Tax Rate ÷ 100).
Which US states have no sales tax?
Five US states have no state sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. However, Alaska allows local jurisdictions to charge sales tax.
What is the average US sales tax rate?
The average combined state and local sales tax rate in the US is approximately 6.6%. State rates range from 0% to 7.25% (California), with local taxes adding 0-5% more.
How do I calculate the pre-tax price from a total?
Divide the total by (1 + tax rate as decimal). For a $108 total with 8% tax: $108 ÷ 1.08 = $100 pre-tax price.
Is sales tax included in the listed price?
In the United States, sales tax is typically added at checkout and not included in listed prices. In most other countries (EU, UK, Australia), VAT or GST is usually included in the displayed price.