- Does it know state/city tax rates?
- No — you enter the rate. Tax rates vary by state, county, and city in the US; there's no reliable built-in lookup.
- What about exempt items?
- Some states don't tax food, medicine, or clothing. The tool shows exempt subtotal + taxable subtotal if you mark items.
- Reverse calculation?
- Given a post-tax total, find the pre-tax amount. Useful for bookkeeping and reimbursements.
- Is VAT different?
- Yes — VAT (European) is typically included in the displayed price; sales tax (US) is added at checkout. Accounting treatment also differs. For VAT use a dedicated calculator.