What the state charges a truck is a declared-weight registration, and the ladder starts under two tons
South Dakota levies no weight-distance tax and no ton-mile tax on motor carriers. What it charges is a registration fee banded by gross weight, which is a different kind of instrument and behaves differently: it is paid once a year on the vehicle rather than accruing with miles.
The proof of that negative is an enumeration rather than a search. The complete section lists of the commercial motor vehicle certificate chapter and of the motor carrier regulation chapter were both walked, and the only money sections in them are registration fees and the disposition of fees received. There is no distance-based charge to find.
SDCL 32-9-15 is the ladder, captioned “Schedule of commercial motor vehicle fees per gross pounds--Older vehicles”. Read at source on September 2, 2026 it runs: gross weight under 4,000 pounds, $85; 4,001 to 6,000, $100; 6,001 to 8,000, $115; 8,001 to 10,000, $130; 10,001 to 12,000, $150; 12,001 to 14,000, $175; 14,001 to 16,000, $200; 16,001 to 18,000, $225; and 18,001 to 20,000, $250. Above that, the statute provides for “each additional 2000 pounds or major fraction thereof in excess of 20,000 pounds, forty dollars.”
A fifteen-to-twenty-six-thousand-pound unit therefore sits squarely inside the published ladder rather than at its edge, and the ladder starts well below anything a freight operation runs. There is no small-vehicle floor here to fall under.
Two provisions in the same section are easy to miss and both change the arithmetic. A further seven dollars is added for vehicles or combinations over seventy-eight thousand pounds under the overweight provisions. And the section’s closing sentence — the “Older vehicles” half of its caption — provides that a vehicle ten years old or more by model year on the first of January pays ninety percent of the prescribed fee. A ten-percent reduction on used equipment is a real consideration for a startup buying older trucks.
One small defect in the text is worth noting for anyone doing the arithmetic precisely: the first band is worded as gross weight under 4,000 pounds and the second begins at 4,001, which leaves exactly 4,000 pounds unaddressed between them. Nothing in this range affects a freight venture, but it is the kind of gap that tells you to read the band edges rather than assume them.
- No weight-distance or ton-mile tax survives in either chapter, established by enumerating both section lists.
- The ladder runs $85 under 4,000 pounds through $250 at 18,001 to 20,000 pounds.
- Above 20,000 pounds, forty dollars for each additional 2,000 pounds or major fraction.
- A further seven dollars applies above seventy-eight thousand pounds.
- A vehicle ten years old or more by model year on January first pays ninety percent of the prescribed fee.
- The first two bands leave exactly 4,000 pounds unaddressed.