Calculated using standard mathematical and industry formulas.
Calculate sales tax by multiplying pre-tax item price by the tax rate decimal: Tax Amount = Price × (Rate / 100). To extract pre-tax price from a total price including tax, divide total price by (1 + Rate / 100). A $100 item with 8.875% tax totals $108.88.
How to use this calculator?
Enter the tag price or sticker price of the item.
Enter the store discount percentage (e.g. 20% off sale).
Enter your state or local sales tax rate percentage.
Read your net savings, pre-tax discounted subtotal, sales tax total, and final checkout amount.
Original Price ≥ $0, Discount% between 0–100%, Tax% between 0–50%.
Step-by-step calculation example
Original $100.00, 20% discount, 8.25% tax → Subtotal: $80.00, Tax: $6.60, Final Total: $86.60 (Saved: $20.00).
Key insights to remember
In most retail jurisdictions, sales tax is applied to the discounted subtotal price, not the original sticker price.
A 20% discount on a $100 item saves $20.00; adding 8.25% sales tax ($6.60) yields a final checkout total of $86.60.
Combining multiple percentage discounts sequentially (e.g. 20% off plus 10% coupon) yields 28% total discount, not 30%.
State sales tax rates in the US range from 0% (e.g. Oregon, Delaware) up to 9.5%+ (e.g. Tennessee, Louisiana combined rates).
How to interpret your results?
Combined State and Local Rates
US sales tax rates vary widely across municipalities because local county and city surtaxes are added on top of the baseline state rate.
Expert advice & guidance
💡 Shopping tip: When purchasing major items in the US, five states (Alaska, Delaware, Montana, New Hampshire, Oregon) levy zero statewide sales tax.
Frequently asked questions
How do you calculate sales tax on an item?
To calculate sales tax, convert the tax percentage into a decimal (e.g., 8.875% = 0.08875) and multiply it by the pre-tax item price: Sales Tax Amount = Pre-Tax Price × (Tax Rate / 100).
What is sales tax and how does it work?
Sales tax is a ad-valorem consumption tax collected by retailers at the point of sale on behalf of state and local municipal governments, based on a set percentage of the retail price.
Which US states have no sales tax?
Five US states do not levy a statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon (the NOMAD states). However, local jurisdictions in Alaska may charge municipal taxes.
How to calculate tax backwards from total amount (reverse tax)?
To extract the pre-tax price from a total price including tax, divide the total price by 1 plus the tax rate decimal: Pre-Tax Amount = Total Price / (1 + Tax Rate / 100).
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