South Carolina IFTA Filing — Rates, Portal & Deadlines
Everything an owner-operator needs to file IFTA in South Carolina — current quarterly rates, the base-state portal, surcharge handling, and the common mistakes that lead to penalties.
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South Carolina IFTA at a glance
| IFTA jurisdiction | Yes |
|---|---|
| Administering agency | South Carolina Department of Motor Vehicles |
| Filing frequency | Quarterly (Apr 30, Jul 31, Oct 31, Jan 31) |
| Surcharge | No |
| E-file required | No (electronic preferred, paper accepted) |
| Late penalty | $50 or 10% of tax due, whichever is greater |
| Record retention | 4 years (fuel receipts, mileage records, ELD logs) |
What's specific to South Carolina
South Carolina is a standard IFTA jurisdiction filed through the SC DMV. Common transit state on the I-95 corridor.
How to file IFTA in South Carolina
- Compile your quarterly mileage by jurisdiction — including deadhead and detour miles. ELD reports (Samsara, KeepTruckin / Motive, Geotab) export this directly.
- Compile your fuel purchases by jurisdiction. Fleet-card CSVs from EFS, Comdata, WEX, or RTS produce this in one click; if you're paying by personal card, you'll be reconciling receipts manually.
- Calculate fleet MPG (total miles ÷ total gallons), then taxable gallons per state (state miles ÷ fleet MPG). Use the free IFTA calculator if you'd rather not do this by hand.
- Apply the current quarterly rate for South Carolina, then net it against fuel tax already paid at the pump in South Carolina.
- File through the South Carolina Department of Motor Vehicles IFTA portal by the quarterly deadline.
- Retain receipts, mileage records, and ELD reports for at least 4 years in case of audit.
Common South Carolina IFTA mistakes
Filing a zero return late
Even if you didn't run South Carolina this quarter — or didn't run at all — you're still required to file. A late zero return triggers the same $50 minimum penalty as any other late filing.
Mixing up where you fueled vs. where you drove
Fuel purchased at the South Carolina state line counts for the state at the pump, not the state you drove next. This is where shoebox-of-receipts owner-operators most often lose IFTA credits.
Using rate-con planned miles instead of actual driven miles
The rate con says one number. Your actual mileage — including detours, fuel stops off-route, and rerouting around weather — is usually 5-10% higher. IFTA wants what you actually drove.
Run your South Carolina IFTA in 3 minutes — free
Upload your rate cons and fuel receipts. We pull the South Carolinamiles and gallons, apply current quarterly rates, and hand you a filing-ready PDF.
Open the free IFTA calculatorNo signup required. One full calc per IP.
Other state IFTA guides
IFTA Filing Guide for Owner-Operators
Step-by-step IFTA primer covering all 48 states.
How IFTA Math Works
Worked examples of taxable gallons, credits, and net tax.
Owner-Operator Tax Deductions
Schedule C deductions every owner-operator can claim.
Trucking Compliance Checklist
Every DOT, FMCSA, and state filing in one place.