South Dakota IFTA Tax Rate — 2026
Last refreshed from iftach.org on May 14, 2026.
How South Dakota IFTA tax is calculated
For every gallon of diesel your truck "burned" inside South Dakota during the quarter, you owe $0.2800 in IFTA tax. The number of taxable gallons isn't the gallons you bought there — it's the miles you drove inside South Dakota divided by your fleet's average miles-per-gallon for the whole quarter.
Your IFTA return then nets that against the South Dakota fuel-tax you already paid at the pump on gallons purchased inside the state. If you ran more South Dakota miles than you bought South Dakota fuel, you owe the difference. If you bought more South Dakota fuel than you ran South Dakota miles, you get a refund or credit.
Quick South Dakota IFTA estimate
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Common South Dakota IFTA filing questions
- Do I file IFTA in South Dakota if my home base is here? If your IFTA base jurisdiction is South Dakota, you file your quarterly return with the South Dakota Department of Revenue (or equivalent). Your filing covers every IFTA jurisdiction you ran in, not just South Dakota.
- What if I only drove a few miles through South Dakota? Every IFTA mile counts, even if you only crossed the state. Track them on your trip sheet or ELD report — you'll owe (or get refunded) South Dakota's share whether you bought fuel here or not.
- What if South Dakota fuel is cheaper than the IFTA tax? The IFTA rate above is what you owe per gallon "consumed" in South Dakota. The pump price already includes South Dakota's state fuel tax — that's what gets credited on your return. If you bought all your fuel in a low-tax state and drove all your miles in South Dakota, you'll owe the full South Dakota rate on those gallons at filing time.
South Dakota IFTA filing deadlines
IFTA returns are due quarterly across all 48 contiguous U.S. states, including South Dakota:
- Q1 (Jan–Mar): due April 30
- Q2 (Apr–Jun): due July 31
- Q3 (Jul–Sep): due October 31
- Q4 (Oct–Dec): due January 31
Late filings collect penalties even if you owe nothing — some states charge $50 minimum per late return. File on time even if your net due is $0.
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