South Dakota IRP: Motor Carrier Connect and the Tonnage System

Quick Answer

South Dakota’s DOR Motor Carrier Section in Pierre runs IRP and IFTA as a one-stop shop, with applications and renewals through Motor Carrier Connect (sd.motorcarrierconnect.com). IRP renewals are staggered into just four months — February, May, August, November — with packets ~45 days ahead and no temporaries allowed on renewals. The 2290 runs through the tonnage system: at 28 tons (55,000 pounds) or higher, the stamped or e-file-watermarked Schedule 1 goes to your county treasurer to obtain tonnage decals, with a July–September window where the prior period’s form is accepted.

South Dakota’s heavy-truck compliance has a distinctly local flavor: counties handle titling and registration, weight is spoken in tons, and the state enforces the federal HVUT by holding back the tonnage decals mailed from Pierre. The interstate side is compact — one Motor Carrier Section, one portal, four renewal months.

The tonnage system and the 2290

South Dakota publishes a full HVUT FAQ, and its framing is unique: registered owners of vehicles licensed at a gross weight of 28 tons or higher — 55,000 pounds or more — must file the federal tax and prove it to the state. Best practice, in the state’s own words, is bringing your stamped 2290 to the county treasurer when purchasing registration at 28 tons or above; failing to provide it can mean not being able to renew.

Accepted proof: a Schedule 1 stamped and returned by the IRS, or one endorsed with the e-file watermark and received date — both are "stamped 2290s" to South Dakota — or an unstamped return with documentation that the IRS accepted payment. From October to June the current period is required; during July, August and September the previous period’s stamped 2290 may be supplied. New purchases start with Form 1100 (Request for Tonnage Decals) at the county, then file the HVUT no later than a month after the licensing month. Decals for 28-ton-plus vehicles mail from Pierre only after HVUT verification.

Motor Carrier Connect and the quad-staggered calendar

Interstate carriers work through Motor Carrier Connect for IRP applications and renewals (IFTA quarterly returns file in the separate SD Interstate Online system, e-filing mandatory since 2020). New accounts start with a call to the Motor Carrier Section — (605) 773-3541, sdmotorcarrier@state.sd.us — for the packet: the records agreement, proof of residency, and for sole proprietors a South Dakota driver’s license.

The renewal calendar is the state’s signature quirk: fleets expire in only four months — February, May, August, or November — with packets about 45 days ahead. Miss the payment and the tags simply expire: South Dakota allows no temporary credentials on renewals, and late payment where a temporary clearance was issued draws a penalty of $10 or 10% plus interest. Renewals are also blocked for USDOT out-of-service status, delinquent returns, or unpaid audits.

Small print worth knowing: cab-card corrections requested more than 15 days after receipt cost $3 per card, commercial trip permits run $15 single-trip, and temporary clearances max out at 45 days.

Frequently asked questions

What are South Dakota tonnage decals?⌄
The weight credentials on South Dakota commercial plates — issued by counties below 28 tons, but mailed from the Motor Vehicle Division in Pierre for vehicles at 28 tons (55,000 pounds) and above, and only after the state verifies your Heavy Vehicle Use Tax filing. The stamped Schedule 1 is literally the key to the decals.
When do South Dakota IRP fleets renew?⌄
In one of four months — February, May, August, or November — on a staggered assignment, with renewal packets about 45 days ahead. There are no temporary credentials on renewals: unpaid means expired, so the window is firm.
Which 2290 period does South Dakota accept?⌄
October through June: the current period only. July through September: the previous period’s stamped 2290 is acceptable — mirroring the federal filing calendar, where the new return is not due until August 31.
I just bought a truck in South Dakota — what is the process?⌄
Register at the county treasurer using Form 1100’s first declaration (Request for Tonnage Decals), then file the HVUT — the state says no later than one month after the month the vehicle was licensed. E-file and the watermarked Schedule 1 is ready well inside that window.

Related guides

More in State Motor-Carrier Portals & IRP Offices

Official sources

Agency rules, fees and contacts can change — confirm current requirements with the agency before acting. This guide is general information for truckers, not tax or legal advice.

Need your stamped Schedule 1 for the paperwork above?

E-file Form 2290 with Send 2290 and download the IRS-watermarked Schedule 1 — typically within minutes of IRS acceptance.

E-File Form 2290