Sales Tax Calculator
Calculate sales tax on purchases or reverse-calculate the pre-tax price from a total. Supports adding tax to a price or removing tax from a total. See also Percentage Calculator and Discount Calculator.
How to Calculate Sales Tax
To calculate sales tax, multiply the pre-tax price by the tax rate expressed as a decimal. For example, if an item costs $100 and the tax rate is 8.25%, the tax is $100 × 0.0825 = $8.25, making the total $108.25. To reverse-calculate (find the pre-tax price from a total), divide the total by (1 + tax rate). For a $108.25 total at 8.25% tax: $108.25 / 1.0825 = $100.00 pre-tax.
Sales Tax Formula
Add Tax:
Tax Amount = Price × (Tax Rate / 100)
Total = Price + Tax Amount
Remove Tax:
Pre-Tax Price = Total / (1 + Tax Rate / 100)
Tax Amount = Total − Pre-Tax Price
Example
Price = $100.00, Tax Rate = 8.25%
Tax Amount = $100.00 × 0.0825 = $8.25
Total = $100.00 + $8.25 = $108.25
Reverse: Total = $108.25
Pre-Tax = $108.25 / 1.0825 = $100.00
Tax = $108.25 − $100.00 = $8.25
US State Sales Tax Rates Reference
| State | State Rate | Avg. Local | Combined |
|---|---|---|---|
| California | 7.25% | 1.57% | 8.82% |
| Texas | 6.25% | 1.94% | 8.19% |
| New York | 4.00% | 4.52% | 8.52% |
| Florida | 6.00% | 1.01% | 7.01% |
| Illinois | 6.25% | 2.49% | 8.74% |
| Pennsylvania | 6.00% | 0.34% | 6.34% |
| Washington | 6.50% | 2.67% | 9.17% |
| Tennessee | 7.00% | 2.55% | 9.55% |
Frequently Asked Questions
How do I calculate sales tax from a total?
Divide the total by (1 + tax rate as a decimal). For example, if the total is $108.25 and the tax rate is 8.25%, the pre-tax price is $108.25 / 1.0825 = $100.00, and the tax is $8.25.
Which US states have no sales tax?
Five states have no state sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. However, Alaska allows local jurisdictions to charge sales tax.
Is sales tax the same as VAT?
No. Sales tax is collected only at the final point of sale. VAT (Value Added Tax) is collected at every stage of production and distribution. VAT is common in Europe and many other countries, while sales tax is used in the US.
Are groceries taxed?
It varies by state. Most states exempt unprepared food (groceries) from sales tax, but some states like Alabama, Mississippi, and South Dakota tax groceries at the full rate. Others tax groceries at a reduced rate.
Solved Examples
Example 1: Calculating sales tax on a purchase
Solution:
Purchase price = $849.99 (laptop), Sales tax rate = 8.25% (Texas)
Sales tax = $849.99 × 0.0825 = $70.12
Total price = $849.99 + $70.12 = $920.11
Answer: You pay $70.12 in sales tax for a total of $920.11.
Example 2: Finding pre-tax price from total paid
Solution:
Total amount paid = $53.50, Tax rate = 7%
Pre-tax price = Total / (1 + Tax Rate) = $53.50 / 1.07 = $50.00
Tax paid = $53.50 - $50.00 = $3.50
Answer: The item cost $50.00 before tax; $3.50 was sales tax.
Example 3: Combined state + local sales tax
Solution:
Purchase = $1,200, State tax = 6%, County tax = 1.5%, City tax = 1%
Total tax rate = 6% + 1.5% + 1% = 8.5%
Tax amount = $1,200 × 0.085 = $102.00
Total = $1,200 + $102 = $1,302.00
Answer: Combined sales tax of 8.5% adds $102 to the $1,200 purchase.
Practice Questions
Try these on your own:
- A $45 meal in a 9.5% tax area. What is the total? (Answer: $49.28)
- You paid $321 total for shoes. Tax rate was 7%. What was the pre-tax price? (Answer: $300)
- Annual spending = $40,000 in an 8% sales tax state. How much tax do you pay yearly? (Answer: $3,200)
- Item costs $99.99 online (no tax) vs $89.99 in-store (8.5% tax). Which is cheaper? (Answer: In-store at $97.64)
- A car costs $35,000 with 6.25% sales tax. What is the total tax on the vehicle? (Answer: $2,187.50)
Common Mistakes to Avoid
A common mistake is not realizing that sales tax rates vary by location — the rate can change between neighboring cities. Another error is calculating tax on the discounted price vs. original price; sales tax always applies to the final selling price (after coupons and discounts in most states). Many people confuse sales tax (added at purchase) with VAT (Value Added Tax, included in listed prices in many countries). When budgeting for large purchases like cars or appliances, forgetting to include sales tax can throw off your budget by hundreds or thousands of dollars. Some states exempt groceries, clothing, or prescription medications from sales tax — not all purchases are taxed equally. Finally, online purchases are subject to sales tax based on the delivery destination in most US states since the 2018 Supreme Court ruling.
Key Takeaways
- Sales Tax = Purchase Price × Tax Rate. Total = Price × (1 + Tax Rate).
- US sales tax ranges from 0% (Oregon, Montana) to over 10% in some cities (combined state + local).
- To find pre-tax price: divide total by (1 + tax rate).
- Sales tax is regressive — it takes a larger percentage of income from lower-income households.
- Many states exempt necessities (groceries, medicine, clothing) from sales tax.
- Online purchases are taxable in most states based on delivery address since 2018.