South Dakota Sales Tax Calculator
Estimate sales tax in South Dakota at the average combined rate of 6.11%. Add tax to a price or back it out of a total.
Enter your combined state + local rate. U.S. sales tax rates vary by city and county.
South Dakota sales tax rate
| State sales tax rate | 4.2% |
| Average local sales tax rate | 1.91% |
| Average combined rate | 6.11% |
Population-weighted averages as of July 1, 2025 (Tax Foundation). Your exact rate depends on your city and county.
How sales tax works in South Dakota
South Dakota charges a statewide rate of 4.2%. Counties and cities add their own rates on top, which is why the combined total varies by location. The 1.91% figure above is the population-weighted average. To add tax, multiply the price by the rate; to back it out of a tax-inclusive total, divide by 1 plus the rate.
Worked example
A $100 purchase at South Dakota's average combined rate of 6.11% adds $6.11 in sales tax, for a $106.11 total.
Frequently asked questions
What is the sales tax rate in South Dakota?
South Dakota's statewide rate is 4.2%. With an average local rate of 1.91%, the typical combined rate is about 6.11%.
How much is sales tax on $100 in South Dakota?
At the average combined rate of 6.11%, sales tax on a $100 purchase is about $6.11, for a total of $106.11. Your exact rate depends on your city and county.
Why is my local rate different?
Counties and cities in South Dakota set their own add-on rates, so the total varies by location. 1.91% is the population-weighted average; enter your exact combined rate for a precise figure.
Sales tax by state
Or use the general sales tax calculator with any rate.