IFTA Registration and Compliance in South Carolina

To set up an International Fuel Tax Agreement (IFTA) account in South Carolina, a carrier must apply through the South Carolina Department of Revenue (SCDOR). The state requires any motor carrier based in South Carolina that operates qualified motor vehicles in two or more jurisdictions to register. A qualified vehicle is defined by the FMCSA as having two axles and a gross vehicle weight exceeding 26,000 pounds, having three or more axles regardless of weight, or being used in combination where the total weight exceeds 26,000 pounds. DispatchTool helps South Carolina carriers manage these requirements by automatically tracking state-by-state mileage and fuel purchases for quarterly reporting. This integration reduces the risk of manual data entry errors that often lead to SCDOR audits. After completing your state registration and obtaining your decals, you can create a DispatchTool account to centralize your IFTA trip sheets and automate the calculation of taxes owed to each jurisdiction.

Eligibility Requirements for South Carolina Carriers

Before applying, you must establish that South Carolina is your base jurisdiction. According to the SCDOR, a carrier qualifies if their operational control and records are maintained in the state and their qualified motor vehicles accrue mileage on South Carolina highways. A qualified motor vehicle must meet one of three criteria: a power unit with two axles and a GVW or registered GVW over 26,000 pounds, a power unit with three or more axles regardless of weight, or a combination exceeding 26,000 pounds. Recreational vehicles are exempt from these requirements regardless of weight or axle count. Carriers must also have a valid federal DOT number and an active Unified Carrier Registration (UCR) status.

The SCDOR Application Process

South Carolina requires carriers to register for IFTA via the MyDORWAY portal, the state's online tax system. New applicants must submit Form I-330, which asks for the carrier's Federal Employer Identification Number (FEIN) or Social Security Number (SSN), legal business name, and physical address. Unlike some states that charge a flat registration fee, South Carolina currently provides the IFTA license and the initial two decals for the current calendar year at no cost for the first set. However, a fee of $8.00 is typically charged for each additional set of decals requested for extra vehicles in the fleet. The SCDOR processes these applications within 10 to 15 business days, after which the physical decals are mailed to the carrier.

Recordkeeping Standards and Documentation

The IFTA agreement mandates strict recordkeeping for a period of four years from the filing date. South Carolina carriers must maintain Individual Vehicle Mileage Records (IVMR) that include the starting and ending dates of each trip, trip origin and destination, routes of travel, and odometer readings at state lines. Fuel records must include original receipts or invoices showing the number of gallons purchased, the fuel type, the price per gallon, and the location of the purchase. According to the IFTA Procedures Manual, digital records are acceptable provided they can be produced in a readable format during an audit. Failure to maintain these records can result in the SCDOR assessing a tax based on a standard 4.0 miles per gallon for the entire fleet.

Quarterly Filing Deadlines and Penalties

South Carolina IFTA returns are due on the last day of the month following the end of each calendar quarter. The first quarter (Jan-Mar) is due April 30, the second (Apr-Jun) is due July 31, the third (Jul-Sep) is due October 31, and the fourth (Oct-Dec) is due January 31. If the deadline falls on a weekend or legal holiday, the return is due the next business day. Failure to file by these dates results in a late penalty of $50.00 or 10% of the net tax due, whichever is greater. Interest is also applied to any unpaid tax at a rate of 1% per month. Even if no interstate miles were traveled during a quarter, a 'No Operations' return must still be filed to avoid the $50.00 non-filer penalty.

Annual License and Decal Renewal

IFTA licenses in South Carolina expire on December 31 each year. The SCDOR allows a two-month grace period (January and February) for the display of the new year's decals, provided the carrier has submitted their renewal application by December 31 and holds a valid license for the new year. Renewals must be completed online through MyDORWAY. During the renewal process, the carrier must be in good standing with all state taxes; if there are outstanding liabilities or missing quarterly returns, the SCDOR will block the issuance of new decals. Carriers should inspect their decals regularly, as faded or illegible decals can result in roadside citations ranging from $100 to $500 depending on the jurisdiction.

Calculating Net Tax Due or Credit

The net tax due is calculated by determining the total fuel consumed in each jurisdiction compared to the tax-paid fuel purchased in that jurisdiction. For example, if a truck travels 1,000 miles in a state with a 5.0 MPG average, it consumed 200 gallons. If the carrier only purchased 150 gallons in that state, they owe tax on the remaining 50 gallons at that state's specific tax rate. Conversely, if 250 gallons were purchased, the carrier receives a credit for the 50-gallon overpayment. South Carolina's motor fuel tax rate is subject to annual adjustments; as of July 2024, the rate is $0.30 per gallon. These credits and liabilities across all 48 contiguous states and Canadian provinces are netted out on the single quarterly return filed with the SCDOR.

Sources

South Carolina Department of Revenue (SCDOR) (2024) — https://dor.sc.gov/tax/ifta International Fuel Tax Association, Inc. (2024) — https://www.iftach.org/ South Carolina Department of Motor Vehicles (2024) — https://www.scdmvonline.com/

Frequently asked

How much does IFTA registration cost in South Carolina?

The initial IFTA license and the first set of two decals are provided for free by the South Carolina Department of Revenue. Additional sets of decals for other vehicles in your fleet cost $8.00 per set.

Do I need IFTA if I only stay within South Carolina?

No, if your qualified motor vehicle never leaves the state of South Carolina, you do not need an IFTA license. You simply pay the South Carolina motor fuel tax at the pump.

What is the penalty for not filing an IFTA return in SC?

The SCDOR imposes a penalty of $50.00 or 10% of the tax due, whichever is greater, for late or missing returns. Interest also accrues at a rate of 1% per month on any unpaid balance.

Can I get temporary IFTA permits in South Carolina?

Yes, if you do not have a permanent IFTA license, you can purchase a 72-hour fuel permit for $15.00 from the South Carolina Department of Motor Vehicles (SCDMV) before entering the state.