Sales Tax Calculator
Sales tax calculator
Add tax, extract tax, or find the implied rate.
Quick scenarios
Quick scenarios
Total after tax
$54.11
$49.99 + $4.12 tax
Live update
8.25%
combined rate
Taxable
$49.99
Tax
$4.12
Rate
8.25%
Discount, shipping, local rate & display
Assumptions & basis
- This route does not look up live jurisdiction rates. Enter the combined rate that applies to the address and product you are checking.
- Discounts, shipping, and exemptions are modeled arithmetically, but real invoice taxability rules vary by jurisdiction and product category.
- Display currency changes formatting only. There is no exchange-rate conversion or region-specific invoice localization.
- Full-precision mode is useful for reconciliation, but official receipts may round tax at item or invoice level differently.
Formula basis: Tax = Taxable amount × rate; Total = pre-tax total + tax; Pre-tax = tax-inclusive total / (1 + rate).
Calculation detailssteps and report export
- No discount: merchandise remains $49.99.
- Taxable amount = $49.99.
- Tax = $49.99 × 8.25% = $4.12.
- Total = price after discount + shipping + tax = $54.11.
Formula
Tax = Taxable amount × rate Total = pre-tax total + tax Pre-tax = inclusive total / (1 + rate) t = \frac{\text{After} - \text{Before}}{\text{Before}} \times 100 - For add-tax calculations, apply the combined rate to the taxable amount after discounts and any taxable shipping.
- For a tax-inclusive total, divide by one plus the decimal rate to recover the pre-tax price.
- To find the implied rate, divide the tax difference by the before-tax price and multiply by 100.
Example
Worked example: 49.99 at 8.25%
- 1 Raw tax = 49.99 × 8.25/100 = 4.124175
- 2 Round tax to cents = 4.12
- 3 Total = 49.99 + 4.12 = 54.11
Final total is about 54.11.
How
- Choose Add tax, Extract tax, or Find rate.
- Enter the two requested values or start from a built-in checkout scenario; use 8.25 for 8.25%, not 0.0825.
- Review the explicitly labeled result, then add discounts, shipping, or an additional local rate when needed.
- Open assumptions or calculation details when you need rounding, taxability, or rate-basis context, and copy either the result or full report.
Avoid
- Applying tax twice when subtotal already includes tax.
- Using a statewide, city, or maximum rate as though it applies to every address and product.
- Entering 0.0825 when the field expects 8.25%.
- Assuming discounts or shipping are always taxable the same way in every jurisdiction.
Ref only. Verify assumptions, fees, taxes.
FAQ
Can tax rate be decimal?
Yes, decimal tax rates are supported.
Does this include discounts?
Yes. Add-tax mode supports either a fixed discount amount or a percentage before tax.
Does the calculator look up my local rate?
No. Rates and taxable items vary by exact address and transaction, so verify the combined rate with the relevant tax authority or invoice.
How does tax rounding work?
The default rounds the calculated tax to the selected currency minor unit. A full-precision option is available for comparison, but official invoice rules may differ.
Can I use this for VAT or GST?
The add and extract percentage math is similar, but VAT/GST invoicing, exemptions, and legal rules differ. Treat this as arithmetic, not jurisdiction-specific tax advice.
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