Sales Tax
Calculator
Results
- Total
- $115.00
- Tax
- $15.00
Comparison
| Scenario | Subtotal | Tax | Total |
|---|---|---|---|
| Before tax | $100.00 | $0.00 | $100.00 |
| With tax | $100.00 | $15.00 | $115.00 |
Formula
T = A(1 + r/100)- A
- 100.00
- r
- 15
= 115.00
More in Financial
See all →Frequently asked questions
How does the calculator determine the tax amount on a purchase?+
It multiplies the pre-tax price by the tax rate you enter, which should reflect the combined applicable rate for your state, county, and city, since many jurisdictions layer several sales tax rates on top of each other.
Why do I need to know the combined rate rather than just the state rate?+
Because local sales tax add-ons at the county or city level can meaningfully increase the total rate beyond the state's base rate, so using only the state rate would understate the actual tax charged at checkout.
Can I use this calculator to work backward from a total price?+
Yes, if you enter the final price including tax and the tax rate, the calculator can back out the pre-tax price and the tax amount separately, which is useful for reconciling a receipt or an invoice.
Are all goods and services taxed at the same rate?+
No, many jurisdictions exempt or apply reduced rates to categories like groceries, prescription medication, or clothing, so the general rate entered here may not apply to every purchase — check your local rules for exempt categories.
Does this calculator handle tax on services as well as goods?+
It calculates the tax the same way for any taxable amount you enter, but whether a particular service is taxable at all depends on local law, since many places tax goods more broadly than services.