No statewide or average local sales tax
Montana has a 0% general state and average local sales tax rate. Use this calculator only when a receipt includes a special, product-specific, or out-of-state rate that you need to reverse.
Rate averages as of July 1, 2026. Source: Tax Foundation.
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Reverse-tax formula
Montana's default is 0%. Enter another rate only when the receipt shows one.
What the numbers mean
A 0% statewide average does not guarantee that every charge is tax-free. Lodging, prepared food, alcohol, rentals, and purchases delivered from another jurisdiction can follow different rules. Enter the rate printed on the receipt rather than assuming zero.
The default is 0%, but the rate field remains editable. That keeps the page useful for special taxes and for checking purchases made outside Montana.
Confirm product exemptions and exact local rates before filing or billing.
Worked examples
These examples start with the final amount paid and calculate backward to the original price. The illustrative 5% rate is not the statewide default.
| Total paid | Rate used | Original price | Included tax |
|---|---|---|---|
| $50.00 | 5% | $47.62 | $2.38 |
| $100.00 | 5% | $95.24 | $4.76 |
| $250.00 | 5% | $238.10 | $11.90 |
| $500.00 | 5% | $476.19 | $23.81 |
Local rate shortcuts
The covered cities range from 0% in Great Falls to 0% in Billings. The covered cities currently use the same combined rate.
Rate breakdown
| Rate component | 2026 rate | How to use it |
|---|---|---|
| Montana state rate | 0% | Background rate before local adjustments |
| Avg. local rate | 0% | Population-weighted statewide estimate |
| Average combined rate | 0% | Best fallback when the exact receipt rate is unknown |
State and average local rates are from Tax Foundation: State and Local Sales Tax Rates, Midyear 2026. City, county, district, and product-specific rates can differ.
Questions answered
Montana's average general sales tax rate is 0%. If a receipt includes a special tax, enter the exact percentage printed on that receipt.
Enter the receipt's actual tax rate, then divide the total by 1 plus that rate as a decimal. A zero-tax receipt needs no adjustment.
Montana has no population-weighted general local sales tax add-on in the July 2026 dataset. Product-specific taxes and exemptions may still apply.
No. It is a statewide population-weighted average as of July 1, 2026. Use the purchase location and official Montana Department of Revenue guidance when accuracy is required.
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