The Two Letters Every Owner-Operator Has to Know
If you operate a commercial truck across state lines with a GVW over 26,000 pounds, two interstate registration systems apply to you:
- IRP (International Registration Plan) — the apportioned license plate system that lets you drive in all participating states with one base-state plate.
- IFTA (International Fuel Tax Agreement) — the quarterly fuel tax reconciliation that ensures each state gets the fuel tax for the miles you drove there.
Understanding both is unavoidable. Misunderstanding either is expensive — IFTA penalties run 10% of underpayment plus interest, and IRP audits regularly hit owner-operators for $5,000–$20,000 in back fees and fines.
This guide walks through both systems with 2026 numbers and the records that protect you.
IRP: The Plate
When you register your truck, you can either get a single-state plate (cheap, but only legal to drive in your home state on commercial work) or apportioned plates under IRP. Apportioned plates cost more upfront but are valid in all member jurisdictions (48 U.S. states, DC, and 10 Canadian provinces).
The cost is calculated by:
1. Fees per state, multiplied by
2. Your percentage of miles driven in that state the prior year, summed across all states
Example: An owner-operator running 110,000 miles last year, with 40% of miles in Texas, 30% in Oklahoma, 15% in Arkansas, 10% in New Mexico, 5% in Louisiana. Total IRP registration:
| State | Fee (full) | Apportioned |
|---|---|---|
| Texas | $850 | $340 (40%) |
| Oklahoma | $700 | $210 (30%) |
| Arkansas | $1,100 | $165 (15%) |
| New Mexico | $980 | $98 (10%) |
| Louisiana | $1,250 | $63 (5%) |
| Total | | ~$876 |
Compare that to paying full registration in each state ($4,880) and you see the savings. New IRP registrants without prior-year miles pay an estimated rate based on average distance percentages until they have 12 months of actual data.
Renewals are annual. File with your base-state DMV or motor carrier division.
IRP: Records You Must Keep
The IRP audit standard is brutal: you must be able to reconstruct mile-by-mile, state-by-state distance for every truck. Required records:
- Daily trip records showing date, origin, destination
- Routes traveled (including detours)
- Beginning and ending odometer readings
- State line crossings
- Total miles per state per quarter
- Fuel purchase receipts (cross-checked with IFTA)
ELD GPS data with state-line crossings handles 95% of this automatically. Most modern ELDs export an IRP/IFTA-compatible distance report. Use it. The drivers who get audit-hammered are the ones still keeping paper trip sheets that do not match their ELD GPS data.
Records must be kept for 4 years. Auditors can sample any 3 months in that window.
IFTA: The Quarterly Tax Filing
IFTA reconciles the fuel tax owed to each state based on where you actually burned the fuel. The math is:
1. Calculate your total miles per state during the quarter
2. Calculate your total gallons purchased per state during the quarter
3. Calculate your fleet MPG (total miles / total gallons)
4. For each state: gallons consumed in that state = miles in state / fleet MPG
5. Tax owed in that state = gallons consumed × state tax rate
6. Tax credit in that state = gallons purchased × state tax rate
7. Net per state = owed − credit (positive = you owe, negative = refund)
Sum across all states for the quarter. Net positive = pay IFTA. Net negative = refund credited (or applied to next quarter).
2026 IFTA Rate Changes
IFTA rates change quarterly. Most states update on January 1 and July 1, though some adjust every quarter.
Q1 2026 increases: Georgia, Michigan, Minnesota, New Jersey, and North Carolina all raised diesel rates. Michigan went up 1.7 cents, New Jersey jumped 4.2 cents — the biggest single-state increase of the quarter.
Highest 2026 diesel tax states (approximate):
| State | Diesel Rate (cents/gallon) |
|---|---|
| Pennsylvania | ~74 |
| California | ~88 (state plus state-only surcharges) |
| Indiana | ~57 |
| Illinois | ~52 |
| Washington | ~50 |
Lowest:
| State | Diesel Rate (cents/gallon) |
|---|---|
| Mississippi | ~18 |
| Alabama | ~28 |
| Texas | ~20 |
| Louisiana | ~20 |
| New Mexico | ~21 |
Always verify rates for the quarter you are filing — the official source is the IFTA, Inc. tax matrix at iftach.org.
IFTA Filing Calendar
| Quarter | Period Covered | Filing Deadline |
|---|---|---|
| Q1 | Jan 1 – Mar 31 | April 30 |
| Q2 | Apr 1 – Jun 30 | July 31 |
| Q3 | Jul 1 – Sep 30 | October 31 |
| Q4 | Oct 1 – Dec 31 | January 31 |
You file with your base state (typically the state where your truck is registered for IRP). The base state distributes the tax to other states.
Records IFTA Requires
For each quarter, keep:
- Total miles per state, broken down by truck (ELD output handles this)
- Every fuel purchase receipt showing date, location, gallons, price, vendor — fuel cards typically generate compliant statements
- Bulk fuel records if you have a yard tank
- Tax-paid retail purchases vs untaxed bulk distinguished
Records kept for 4 years. Same as IRP.
How IFTA and IRP Connect
The two systems share data: IRP audits cross-check against IFTA filings, and vice versa. If your IRP report says you ran 30,000 miles in Texas in Q2 but your IFTA report says you only burned fuel for 22,000 Texas miles, you flag yourself for audit.
The fix is simple: use the same source data for both (your ELD's GPS distance report). Do not let your accountant reconstruct one from receipts and the other from logs.
The 2290: Heavy Vehicle Use Tax
Separate but always discussed alongside IFTA/IRP. The Heavy Vehicle Use Tax (HVUT) is a federal annual tax of $550 per truck over 75,000 GVW, due August 31 each year. File IRS Form 2290. You need a stamped Schedule 1 to renew your IRP plates.
Filing Yourself vs Hiring It Out
Owner-operators have three options:
1. Self-file with state DMV portals and IFTA tax software (TruckLogics, FreshFleet, ExpressIFTA all run $20–$60/month)
2. Pay a permit/tax service like ATBS, TruckingOffice, or local CPAs ($100–$250 per quarter for IFTA, similar for IRP renewal)
3. Run through your factoring/dispatch company's services (often included in their fee)
Most owner-operators in their first year use a service. After 6–12 months, many switch to self-file with software because the recurring cost is much lower.
Common Mistakes That Trigger Audits
- Reporting "estimated" miles instead of actual GPS data
- Mismatched fuel receipts and gallons claimed — if you claim 1,400 gallons but receipts only total 1,200, the audit finds the gap
- Forgetting one state where you ran a single load
- Bulk fuel without documentation — keep your tank's monthly inventory log
- Late filings — 10% penalty plus interest from due date
- Filing zero miles when GPS shows movement — automatic red flag
Trip Permits: When You Can Skip IRP/IFTA Temporarily
Single-trip permits exist for rare cross-state runs without full IRP/IFTA registration. Costs $20–$100 per state, valid 5–10 days, single-trip only.
Trip permits make sense when:
- A new authority is awaiting IRP plates and needs to move
- A driver typically operates intrastate but has one out-of-state run per year
- A relocating owner-operator needs to bridge between base states
Trip permits do NOT make sense as a regular substitute for IRP. The cost per trip becomes punitive within a few months, and DOT will eventually flag the pattern.
Audit Defense
If you get audited (5–7% of IFTA filers per year), the auditor will:
1. Pull 3 random months from the past 4 years
2. Request all source records (ELD GPS data, fuel receipts, dispatch logs, IRP records)
3. Recalculate your miles per state and fuel purchases
4. Compare to what you filed
If the recalculated owed amount is within 5% of what you filed, you usually pass. Beyond that, you owe the difference plus penalties and interest.
The owner-operators who survive audits cleanly are the ones who:
- Use ELD GPS data as the single source of truth
- Keep digital fuel receipts (most fuel cards do this automatically)
- Reconcile every quarter before filing, not at audit time
- Match IRP and IFTA mile totals to within 100 miles per state per quarter
The Bottom Line
IFTA and IRP are not optional and they are not casual. Owner-operators who treat them as a quarterly chore — pull the ELD distance report, match it to fuel receipts, file on time — never have problems. Those who reconstruct after the fact, "estimate" miles, or mix bulk fuel into retail records get hit with audit findings that wipe out years of profit. The systems are a fixed cost of running interstate commerce, and the math is straightforward when your records are clean. Pair this with our Owner-Operator Cost Breakdown for the full operating-cost picture.