Small US retail purchase
- Input
- $100.00 at 8%
- Tax amount
- $8.00
- Final price
- $108.00
For a $100 pre-tax item at 8%, reserve the final price for checkout and use the tax amount to check the receipt line.
🧾 Sales Tax Calculator
Use this free sales tax calculator to estimate the tax on a purchase and find the total price after tax.
Select the United States or Canada, then enter the price before tax and the applicable percentage. The calculator instantly shows the estimated tax amount and checkout total in USD or CAD.
You can use a combined US state and local sales tax rate or an applicable Canadian GST, HST, PST, or QST rate.
🧮 Purchase Tax Calculator
Select a country, then enter the purchase price and applicable tax rate.
🌎 Select country
Results are displayed in USD.
Use the combined state and local rate that applies to the purchase.
💰
Estimated Tax Amount
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Estimated Total Price
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📝 Enter a valid price and tax rate to see the estimate.
Financial disclaimer: This calculator is for informational purposes only and does not provide financial, tax, legal, loan, or investment advice. Actual results may vary depending on tax rules, exemptions, fees, rounding, and transaction details.
🧭 What Do You Know Before You Calculate Sales Tax?
This is a forward sales-tax calculator. It starts with a price before tax and one tax rate; it does not extract tax from a tax-inclusive total.
| Known input | What this calculator finds | What else you need | Typical use |
|---|---|---|---|
| Pre-tax price + applicable rate | Tax amount + final price | The correct combined rate for the transaction | Checkout estimate, quote check, or purchase budget |
| Final or tax-inclusive price + rate | Not supported in this tool | A reverse-tax or tax-inclusive calculation | Use a tool designed to separate tax from a total |
📘 How to Turn a Tax Rate Into a Checkout Estimate
Enter the taxable price before tax and the single rate you want applied. FigureNorth converts that percentage to a decimal, calculates the added tax, and adds it to the starting price.
- 1. Confirm that the amount is before tax.
- 2. Find the rate that applies to the specific item and transaction.
- 3. Enter a combined rate when several tax components apply together.
- 4. Use the tax amount to review the added charge and the final price to plan the payment.
🎯 When This Calculator Is Useful
- ✓ Estimate a checkout total before making a purchase.
- ✓ Review the tax line and total on a receipt or invoice.
- ✓ Compare purchases when the applicable rates differ.
- ✓ Check whether a contractor or supplier quote appears to add the entered rate correctly.
- ✓ Reserve enough room in a household, renovation, or business-expense budget.
🧾 Tax Amount vs Final Price
Tax amount
The added tax by itself. On a receipt or invoice, this is the amount charged above the pre-tax base when the whole base is taxable at the entered rate.
Final price
The pre-tax amount plus the calculated tax. This is the estimated amount to budget for checkout before any unmodeled fees or adjustments.
💡 A $100 purchase at 8%
The production calculator returns $8.00 of tax and a $108.00 final price. The first number explains the added charge; the second is the estimated checkout amount.
🔎 Know What the Calculation Does—and Does Not Do
Sales tax is not the same as a discount
A discount reduces a price; sales tax adds to the taxable amount. If both apply, the order and taxable base matter. This calculator does not apply coupons or discounts automatically, so enter the correct post-discount pre-tax amount when the applicable rules require it.
Tax-exclusive vs tax-inclusive prices
This calculator expects a tax-exclusive, pre-tax amount and adds tax on top. It does not separate included tax from a displayed total. For a VAT-inclusive amount, use a calculation that explicitly supports removing included tax.
🌎 US and Canada Tax-Rate Planning
The US/CA selector changes the result currency and the rate label. It does not select a jurisdiction, fetch a live rate, or decide whether the transaction is taxable.
🇺🇸 United States combined rates
A rate may combine state, county, city, municipal, or special-district components. Enter the final combined percentage that applies to the transaction rather than assuming a statewide rate is sufficient.
🇨🇦 Canadian GST, HST, PST, and QST
Enter the full rate you want calculated. The tool can apply a GST, HST, or combined GST and PST/QST percentage, but it does not show those components as separate lines or determine place-of-supply treatment.
The calculator computes the number entered; it does not determine legal applicability or verify that the rate is current.
🛒 Why the Real Checkout Total Can Differ
A correct percentage calculation can still differ from a real receipt because the taxable base or applicable rules may be different from the assumptions entered here.
- • Some products or purchasers may be exempt, zero-rated, or subject to a reduced rate.
- • Tax holidays and local surtaxes can change the applicable rate for a date or location.
- • Shipping, delivery, service fees, discounts, and coupons may receive different treatment.
- • Marketplaces and retailers may apply sourcing or rounding rules at the item or order level.
- • Business, resale, or other exemption documentation may change what is collected.
Use the result for planning and arithmetic checks. Confirm the taxable base and current rules with the seller or an official tax authority when the exact charge matters.
🧮 Worked Checkout and Invoice Examples
Each example below calls the same calculateSalesTax() function as the interactive calculator.
Larger Canadian household or business purchase
- Input
- $2,500.00 at 13%
- Tax amount
- $325.00
- Final price
- $2,825.00
For a CAD 2,500 pre-tax quote at 13%, the CAD tax and final total show the added budget needed if the full quote is taxable at that rate.
Zero-rate planning check
- Input
- $75.00 at 0%
- Tax amount
- $0.00
- Final price
- $75.00
At a 0% entered rate, the tax amount is zero and the final price remains equal to the pre-tax amount. The tool does not decide whether zero-rating is legally correct.
➗ Sales Tax Calculation Used by FigureNorth
The production function keeps the calculation unrounded and returns both the tax amount and total price. Currency formatting rounds the displayed result to two decimal places.
Tax Amount = Price Before Tax × (Tax Rate ÷ 100)
Final Price = Price Before Tax + Tax Amount
One price and one user-entered percentage are calculated at a time. Quantities, multiple line items, discounts, shipping, exemptions, and tax-component breakdowns are outside this calculator's scope.
📚 Method, Scope, Sources, and Review
Method: Tax amount = price before tax × user-entered tax rate ÷ 100. Final price = price before tax + tax amount.
Calculation version: Sales Tax Calculator V2
Last reviewed: August 15, 2026
Maintained by: FigureNorth Editorial Team
Review status: Forward, tax-exclusive planning estimate using a rate supplied by the user; not a tax determination or live-rate lookup.
USAGov — State and local taxes · CRA — Charge and collect GST/HST
❓ FAQ
🧾 What is the difference between tax amount and final price?
Tax amount is only the added tax. Final price is the pre-tax amount plus that tax. For a $100 purchase at 8%, the tax amount is $8 and the estimated final price is $108.
📍 Does the calculator know my local tax rate?
No. It does not use a live rate database or determine which jurisdiction applies. Enter the current rate for the specific purchase location and transaction after checking an official source or the seller.
🇺🇸 Can I use a combined state, county, and city rate?
Yes. Enter the final combined percentage when state, county, city, or district components apply together. The calculator uses that single number and does not verify or display its components separately.
🇨🇦 Does it support Canadian sales taxes?
Yes. Select Canada to display CAD and enter the applicable GST, HST, or combined GST and PST/QST rate. The calculator applies one entered percentage and does not determine or separate the legal components.
🏷️ Does it include discounts or coupons?
No. Apply any discount or coupon according to the seller's and jurisdiction's rules, then enter the correct taxable pre-tax amount. The calculator does not decide whether tax applies before or after a promotion.
📦 Does it calculate tax on shipping?
Not separately. Shipping and delivery charges can receive different treatment. Include a shipping charge in the entered pre-tax amount only when you have confirmed that it belongs in the taxable base.
↩️ Can I reverse-calculate tax from a total price?
No. This tool starts with a tax-exclusive price and adds tax. It does not extract tax from a tax-inclusive total or work backwards from the amount paid.
🛒 Why might the real checkout total differ?
Exempt or reduced-rate items, tax holidays, local surtaxes, shipping treatment, discounts, marketplace rules, fees, and item-level or order-level rounding can all change the real total.