South Dakota IFTA Filing Walkthrough: Motor Carrier Connect

Plenty of states split IFTA between a licensing bureau you visit once and a tax portal you meet four times a year. South Dakota runs the whole program out of one Department of Revenue section in Pierre and one online account: Motor Carrier Connect opens the license, prints it, sells the decals, takes the quarterly return, and collects audit assessments. The fees sit in statute, the filing mandate is electronic, and the enforcement ladder ends in misdemeanors rather than a published late fee. The sourced fees, due dates and penalty facts render on the South Dakota IFTA page; this walkthrough puts them in the order you will meet them.

Step 1: Confirm South Dakota is your base jurisdiction, and that you are interstate at all

South Dakota licenses you when three things hold: you are a South Dakota based interstate motor carrier, you keep operational control and records for the vehicles in South Dakota or can make them available here, and you operate qualified motor vehicles other than recreational ones. The Department has to determine South Dakota is your base jurisdiction before any license issues, so this is a decision the state makes about you, and one formality worth settling before you type an application.

The qualified vehicle test is the familiar one: two axles with a gross or registered gross weight over 26,000 pounds, three or more axles regardless of weight, or use in a combination whose combined weight passes that line. A truck that fails the test never needs an account; a truck that passes and crosses state lines brings the quarterly obligation with it.

A carrier that never leaves South Dakota has no IFTA account to open at all. The license exists for interstate carriers, and the Department will not even renew a license for a carrier whose reported travel stays inside the state or whose returns show zero distance. Intrastate paperwork in South Dakota runs on county registration instead, covered on the South Dakota intrastate authority page.

Step 2: Open the account in Motor Carrier Connect

The application lives online at sd.motorcarrierconnect.com, under Apply for Motor Carrier Account. The packet is the combined IRP/IFTA one: the account application, the South Dakota IRP/IFTA Combined Application, and the IFTA Agreement to Maintain Records, with a power of attorney where an agent signs. Mail works too, to the IFTA office at 445 East Capitol Avenue in Pierre, but the online route is the one the state builds around, and it is where the license prints after approval.

Approval takes about 10 days once the requirements are met: the base jurisdiction determination, the license and decal fees, a bond only where one is demanded, and Unified Carrier Registration fees paid. Most first-time applicants post no bond; the secretary can require security from applicants already delinquent in filing or payment, which tells you who the bond rule is really for.

The fee schedule comes straight from SDCL 10-47B-173: a $10 fee for the initial license, $10 for each annual renewal, $1.50 per vehicle for each set of decals, plus $1.00 to mail each set. The Department of Revenue folds the mailing component in and sells annual decal sets at $2.50, which is the number you will actually pay at checkout. Ten dollars a year for a license is close to nothing, and the statute says where it goes: the motor fuel administration fund.

When approval lands, the license is yours to print from the account, and decal sets mail the next business day. One license covers the company; you copy it and carry a copy in each qualified vehicle, and a photocopy is acceptable in South Dakota. Each vehicle wears one numbered decal set on the lower rear exterior sides of the cab, and the numbers are tied to your account where Highway Patrol can read them. Skip the credentials and the manual tells you what happens next: the vehicle operator gets to buy a fuel permit, plus citations and fines.

The same office runs IRP, and the two accounts are joined at the paperwork level. Fleet registration asks you to verify the vehicles are registered under a South Dakota IFTA license before the IRP application goes in, and the same tax identification number should open both accounts, details worth knowing before you start either. The South Dakota IRP registration page walks that side.

Step 3: Renew each October, and read the February grace period correctly

Each October the online system sends every license holder a renewal notice automatically. You renew in Motor Carrier Connect, verify the license information on file, and order decals for the coming calendar year, because the license runs January through December no matter when you first applied.

Three things stop a renewal: delinquency in filing returns, taxes owed, and reporting that stays inside South Dakota or shows zero distance. The third one surprises carriers whose business went quiet. A fleet that parked its trucks in March and never sent the written cancellation letter still owes each quarter's return, and a carrier whose mileage went all in-state has moved out of the program the license was built for.

IFTA allows a grace period through the last day of February each year, so last year's credentials carry you into February while the new decals arrive. Read the fine edge the manual attaches to it: because of the grace period, a first quarter return must be filed unless you submitted a written cancellation letter to end the license at the close of the tax year. February grace is not a filing holiday. And keep the unused decal sets you accumulate: they stay on hand for audit for four years, and the Department publishes a decal inventory sheet for exactly that bookkeeping.

Step 4: File the quarter online, every quarter

The mandate is unqualified in the manual's IFTA Returns section: filing and payments are required to be done electronically, with the return filed and paid by midnight on the last day of the month following each quarter. The first quarter return is due April 30, the second July 31, the third October 31, and the fourth January 31, and a due date that lands on a Sunday or legal holiday slides to the next business day. The division sends a system email at least 30 days before each due date, and the manual warns that missing the email does not excuse the return.

A quarter with nothing to report still gets a return. The manual names the two cases directly: no taxable miles traveled, or all miles traveled in South Dakota. Either way the return goes in on time showing what happened, which is zero.

One wrinkle worth a minute before the first filing. The manual's online resources list Motor Carrier Connect as the IFTA online filing address, and that is where the account, renewal, decals, and assessment payments live. The Department's Motor Carrier Services page separately says returns may be filed through SD Interstate Online, language that page has carried since electronic filing became mandatory in July 2020. Confirm which login your account uses before the first due date rather than discovering the difference with a deadline behind you.

The return itself bills each jurisdiction's own rate against the miles you ran there. South Dakota's diesel line this quarter is $0.2800IFTA Fuel Tax Rate Matrix, 3rd Quarter 2026 (International Fuel Tax Association, Inc. (IFTA, Inc.))Verified Aug 10, 2026 per gallon in the national matrix. Read every jurisdiction you ran off the IFTA rates by state table, check the arithmetic in the IFTA calculator, and use the national how to file IFTA guide for the records an auditor expects behind the numbers. On the money side, apply an overpayment in one jurisdiction against tax owed in another: a net credit of $25 or more is refunded before the end of the next reporting period, a smaller credit is held or applied forward until it reaches that amount, and refunds stop while any liability is outstanding.

Step 5: Check whether your fleet qualifies to file once a year

Here is the fork small carriers miss. A licensee whose distance in all member jurisdictions other than South Dakota totals less than 5,000 miles in a calendar year may report annually instead of quarterly, after building a year of filing history under the program. The petition goes in writing or by email to the Division of Motor Vehicles before the first quarter return is filed; a request that arrives later waits for the next license year. The other member jurisdictions get notified and any one of them can object, and the privilege arrives in writing before it counts. Plan on it, and once granted you still owe four returns at year end, just dated together.

Step 6: Price a late return the South Dakota way

South Dakota publishes no fixed dollar late fee, which is not the same as forgiveness. The ladder is procedural and it moves fast. A missing return brings a nonfiler notice. Thirty days later a jeopardy assessment is generated on the best information available, and the estimate gives no credit for tax-paid purchases, which is the part that turns a quiet quarter into a real bill. The license is suspended at that point, and you have 60 days to file, pay, or request a hearing before the assessment becomes final with no further recourse. A tax lien can follow, and 30 days after that, a distress warrant.

The criminal side is where South Dakota differs most from states that stop at penalties and interest. Under SDCL 10-47B-187, failing to pay the tax within 60 days of when it becomes due, failing to file a required return within 60 days, or failing to keep or exhibit the required records is a Class 1 misdemeanor. Repeated filing or payment failures inside twelve months, fraudulent returns, and operating after revocation are Class 6 felonies, and operating without carrying fuel use tax credentials is a Class 2 misdemeanor. Dyed fuel carries its own money penalty: $500 for using it in a qualified vehicle, $250 in an unqualified one, with the federal penalty possible on top.

Audits run through the same pipe as everything else. A certificate of assessment gives you 60 days to pay online in Motor Carrier Connect, interest included, or to request a hearing in writing, and the hearing request is the only route to contest the assessment.

Step 7: Skip the license only with a permit in hand

An interstate fuel user with no valid IFTA license has one legal way into South Dakota: buy the temporary single-trip permit from the Department or its agents before entering, at $20 under SDCL 10-47B-175. It covers one trip into or through the state, expires when the vehicle leaves, and does not allow tax-unpaid fuel purchases from any in-state source. At one entry it beats a license on price; somewhere past a handful of entries the $10 annual license plus $2.50 per vehicle in decals wins, and the permit math, along with the commercial vehicle trip permits, is laid out on the South Dakota trip and fuel permits page.

The one desk that answers everything

Motor Carrier Services in Pierre holds the whole program: licensing, decals, returns, audits, and the phone at 605-773-3314, with [email protected] as the email of record. The state hub for every South Dakota surface is South Dakota trucking, and the fact rows behind this walkthrough, each with its source attached, render on the South Dakota IFTA page.

FAQ

Who administers IFTA in South Dakota?

The Department of Revenue's Motor Carrier Services section in Pierre, the same one-stop office that runs IRP. One online system, Motor Carrier Connect, one phone line at 605-773-3314, and one email address cover both programs, so the office that answers an IRP question also answers the IFTA one.

Where does a South Dakota carrier file its IFTA return?

Online, and online only. The 2025 IFTA Manual's IFTA Returns section requires filing and payment to be done electronically, and the manual's online resources list Motor Carrier Connect at sd.motorcarrierconnect.com as the IFTA online filing address. The Department's Motor Carrier Services page also names SD Interstate Online for returns, language carried since electronic filing became mandatory in July 2020, so confirm which login your account uses before the first due date.

What happens if a South Dakota IFTA return is late or missing?

South Dakota publishes no fixed dollar late fee. The ladder runs from a nonfiler notice to a jeopardy assessment after 30 days, estimated without credit for tax-paid purchases, with 60 days to file, pay, or request a hearing while the license sits suspended. Under SDCL 10-47B-187 a failure to file or to pay that survives the 60-day mark is a Class 1 misdemeanor, and repeats inside twelve months climb to a Class 6 felony.