Idaho sales tax in plain terms
Idaho applies a flat 6% statewide sales tax to most retail sales of tangible personal property, set by the Idaho State Tax Commission. What makes Idaho unusual is that it does not permit general county or city sales taxes. The only local add-ons come from designated resort cities (Sun Valley, Ketchum, McCall, Stanley, Driggs and others) and a couple of auditorium districts, which may levy a small local-option tax on lodging, dining and retail. For the vast majority of Idaho the combined rate is simply 6%.
How it works
This calculator runs two formulas in your browser. The combined rate is the fixed 6% state rate plus whatever local resort rate you enter.
Add mode turns a pre-tax price into a total:
total tax = pre-tax price x combined rate
total = pre-tax price + total tax
Remove mode backs the pre-tax amount out of a tax-inclusive total:
pre-tax = total / (1 + combined rate)
tax = total - pre-tax
The result panel then splits the tax into a state portion (6%) and a local portion so you can see exactly where each dollar goes.
Example and notes
A $250 purchase in most of Idaho (6% only) carries $250 x 0.06 = $15.00 of tax, for a $265.00 total. The same $250 purchase in Sun Valley (6% state + 1% resort option = 7%) carries $17.50 of tax for a $267.50 total.
Note: Idaho taxes groceries at the full 6% but issues a refundable grocery tax credit on your income tax return, so the effective rate on food is lower than 6% after the credit. Resort-city local-option rates change by ordinance — verify your exact local rate with the city before relying on it for filing.