What is the sales tax in Roundup city? - The sales tax in Roundup city of Montana is 0% as of 2025. Use the Roundup sales tax calculator to calculate the sales tax for any purchase in Roundup.
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Below is a list of the state sales tax, city sales tax, and county tax rate for Roundup.
| County | State | City | Zip Code | State Tax | City Tax | County Tax | Total Tax |
|---|---|---|---|---|---|---|---|
| Musselshell | Montana | Roundup | 59072 | 0% | 0% | 0% | 0% |