South Dakota IFTA Calculator

South Dakota is a major throughput state on I-90, which runs east-west across the northern Great Plains from the Minnesota border near Sioux Falls to the Wyoming border near Spearfish — a distance of 410 miles. Sioux Falls is the state's largest city and a significant regional distribution hub with extensive processing and retail distribution activity. I-29 runs north-south along the eastern edge of the state from Sioux City, Iowa to the North Dakota border near Fargo. The Mount Rushmore/Black Hills region in the southwest corner generates tourist freight, while the rest of the state is predominantly agricultural — corn, wheat, soybeans, cattle, and hogs from some of the most productive farmland in the northern plains.

South Dakota's IFTA rate of $0.280 per gallon is moderate for the region. Nebraska at $0.290 to the south is slightly higher. Iowa at $0.325 to the southeast is higher. Minnesota at $0.285 to the east is comparable. Wyoming at $0.240 to the west is cheaper. North Dakota at $0.230 to the north is also cheaper. For eastbound I-90 drivers who will be entering Minnesota and eventually Illinois, there's no significant fueling advantage in South Dakota versus Wyoming, but it's the last reasonable stop before the progressively more expensive Midwest states.

Standard weight limits are 80,000 lbs on interstates. South Dakota has some of the most liberal oversize and overweight permitting in the country on state and US highways — permits for loads up to 200,000 lbs on specific approved routes can be obtained from SDDOT. This makes South Dakota a routing preference for wind turbine and heavy equipment moves heading through the northern plains.

I-90 weigh stations near Chamberlain and near the Wyoming border at Spearfish are active. Winter on the South Dakota plains produces severe blizzards — I-90 closures are common from November through March, and the state's open landscape creates ground blizzard conditions with zero visibility even in light snowfall. For IFTA compliance, South Dakota's DOR processes filings cleanly and the moderate rate structure rarely creates complex reconciliation issues.