Two-way sales tax math: add tax to a sticker price, or work backwards from a receipt total to the pre-tax price.
How it works
- Select your calculation direction (Add tax or Extract tax).
- Input the price or receipt total.
- Enter the tax rate percentage to complete the calculation.
Frequently asked questions
Why does reverse tax matter?
Receipts show totals. To book the expense and the tax separately, you need the pre-tax figure — dividing, not subtracting a percentage.
Do US states have one rate?
No — state, county, and city rates stack. Enter the combined rate for your location.
Is this VAT-compatible?
Yes, the math is identical for VAT and GST systems.