Sales Tax Calculator
This calculator uses standard published formulas and is reviewed for calculation accuracy and clarity. The arithmetic is exact. It is not tax advice — confirm current rates with your state or local revenue authority.
Sales tax is a percentage added to the price of goods and services at the point of sale. This calculator takes a pre-tax price and a tax rate and returns both the tax amount and the total price you actually pay. It also shows how to run the calculation in reverse — pulling the pre-tax price back out of a tax-included total — which is handy for expense reports and bookkeeping.
How It Works
Multiply the pre-tax price by the tax rate expressed as a decimal (divide the percentage by 100) to get the tax amount, then add it to the original price for the total. Equivalently, you can get the total in one step by multiplying the price by (1 + rate ÷ 100).
In the United States there is no single national sales tax. The rate you pay is the combined total of state, county, city, and sometimes special-district rates for the location of the sale. That is why the same item can cost more at checkout in one town than in the next one over, and why online orders are taxed based on the shipping address.
Worked Examples
Example 1 — adding tax. An $85 item at an 8.5% combined rate. Tax = $85 × 0.085 = $7.23. Total = $92.23.
Example 2 — a larger purchase. A $1,299 item at 6% tax. Tax = $77.94. Total = $1,376.94.
Example 3 — working backwards. A receipt shows a $92.23 total at 8.5% tax. Pre-tax price = $92.23 ÷ 1.085 = $85.00, so the tax portion was $7.23.
What This Result Means
The tax amount is money collected on top of the seller's price and remitted to the taxing authorities — it is not part of the item's value and not revenue to the seller. The total price is what leaves your account. If you are reselling or claiming the item as a business expense, keep the tax amount separate: it is usually recorded (and sometimes recovered) apart from the pre-tax cost.
Reading the Result
Rough US context for a combined state-and-local rate (verify your exact rate — see below):
- 0%: a handful of states levy no statewide sales tax.
- 4%–7%: typical statewide base rates.
- 7%–10%+: common combined totals once county and city rates are added, especially in large metros.
These bands describe the general US range and are for orientation only. Rates change and vary by exact address; always confirm the current combined rate for the point of sale.
When to Use This Calculator
Use it to budget the real out-the-door cost of a purchase, compare prices across locations with different rates, estimate tax on an online order before checkout, or split a tax-included receipt total back into price and tax for an expense claim.
Limitations
- Applies one flat rate to the whole price. It does not handle items taxed at special rates or tax-exempt categories (many states exempt groceries, prescriptions, or clothing).
- US sales tax only in spirit — for value-added tax (VAT/GST), the headline mechanics differ, though a single end-consumer rate can be modeled here.
- You must supply the correct combined rate; the tool does not look up rates by address.
- Does not apply discounts — apply a discount first, then add tax to the reduced price.
Frequently Asked Questions
How do I find my sales tax rate?
Your combined rate is set by state, county, and city. Search your state revenue department website, which often provides an address-level lookup, or check a recent local receipt. Online retailers calculate it from your shipping address.
Is this the same as VAT?
No. Value Added Tax (VAT), used in many countries, is collected in stages across the supply chain, whereas US sales tax is charged once to the end consumer. This calculator applies a simple end-consumer rate.
How do I reverse-calculate the pre-tax price?
Divide the tax-included total by (1 + rate ÷ 100). For example, a $92.23 total at 8.5% tax: $92.23 ÷ 1.085 ≈ $85.00.
Do I apply tax before or after a discount?
After. Apply the discount to get the sale price, then calculate tax on that reduced amount — that is how checkout systems do it.
Why did I pay a different rate than a friend in another town?
Because county, city, and special-district rates stack on top of the state rate, the combined total varies by exact location — even between neighboring towns.