Calculate
Choose the tax question
TAXThe reference page separates the question into calculate-first flows. Here the same three sales-tax questions stay in one live layout so the price, tax, and rate update instantly.
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Open categoryThis calculator is part of the finance section. Keep the current tool open for calculation, then use the related calculators below to compare nearby planning tasks.
Finance calculator
Sales Tax Calculator
Use a fuller sales tax calculator whenever you need to move between subtotal, tax amount, final price, and the implied tax rate.
How to use this calculator
Sales tax guide
Sales tax questions usually start from one of three places: a before-tax subtotal, an after-tax checkout total, or both prices together when the tax rate is the unknown. This page keeps those same three jobs in one live calculator so you can switch between them without moving to a separate result section.
- Use add-tax mode when you know the subtotal and tax rate and want the tax amount and final checkout price.
- Use extract-tax mode when you know the final amount and tax rate and want to work backward to the before-tax price.
- Use solve-rate mode when you know both prices and want to reverse-engineer the effective tax rate.
Formula / method
Formula / method
This sales tax calculator uses the existing ToolModule calculation model for the inputs shown above. The page keeps the original formulas and result logic intact, then presents the output in a clearer working layout.
- Start with the required inputs in the form above.
- The calculator applies the existing ToolModule calculation logic for this tool.
- Review the result cards, tables, and charts together before making a real-world decision.
Example calculation
Review the current live example
The example below reflects the current values shown in the calculator above, so it updates as you change the form without altering the calculation logic itself.
Example inputs
Before-tax price86.5
Sales tax rate (%)8.25
Example outputs
Before-tax price$86.50
Sales tax$7.14
After-tax price$93.64
Tax rate8.25%
Disclaimer
Use results as planning guidance only
Results are for reference only and do not constitute financial, investment, tax, or legal advice. Product terms, lender rules, tax treatment, and fees can vary in real situations.
- Do not treat calculator output as financial, investment, medical, or legal advice.
- Check assumptions, dates, tax rules, and provider-specific terms before acting on a result.
- Use official documents or professional guidance when the decision has material consequences.
FAQ
Common Sales Tax questions
What is the difference between add-tax and extract-tax mode?
Add-tax mode starts from the subtotal and adds tax forward, while extract-tax mode starts from the final total and removes tax backward.
When should I use solve-rate mode?
Use solve-rate mode when both the before-tax and after-tax prices are known but the exact tax rate is not.
Why does this page update live instead of jumping to a result block?
The reference page uses calculate-first flows. Here all three sales-tax questions update in place so you can compare the subtotal, tax amount, and final total immediately.