Texas IFTA Tax Rates for 2026 Q3
The official Texas diesel and gasoline rates for your quarterly IFTA return — with Webfile filing steps, the $50-or-10% penalty rule, and why the flat 20¢ rate makes Texas a fuel-stop magnet.
Texas IFTA Rates for Q3 2026 (Jul - Sep 2026): What Carriers Need to Know
Texas charges a flat $0.2000 per gallon on gasoline, gasohol and special diesel, and $0.1500 per gallon on LNG and CNG — the figures printed in the IFTA Inc. Tax Matrix for Q3 2026, effective July 1, 2026. The table below shows the last four quarters: the 20¢ rate has not moved once, which is exactly why owner-operators who write per-state rates on a notepad tend to circle Texas on their fuel-stop plan.
The Texas Comptroller of Public Accounts administers IFTA for Texas-based carriers. Texas steers applicants toward its Webfile system — the Comptroller's online channel for IFTA license applications and quarterly return filings — rather than mailing paper forms. Before starting an application, pull together what Webfile asks for: Social Security numbers for sole proprietors, officers or directors; your Texas Taxpayer Number if the business is already registered in Texas; your IRP cab card number (or the license plate number of each qualified motor vehicle if you have no IRP account); and your USDOT number.
The Texas Comptroller publishes the Texas IFTA Guidebook (Publication 96-336) as the official state reference for IFTA carriers. The guidebook covers qualified motor vehicle definitions, record-keeping duties, how to file amended returns, and the Comptroller's audit procedures — it is the document auditors cite when examining a Texas-based carrier's records. Carriers new to Texas IFTA are encouraged to download a current copy from the Comptroller's website before submitting their first return.
For IFTA purposes, the tax accrues where you burn the fuel, not where you buy it. Texas’s flat 20¢ per-gallon rate is low relative to neighboring states like New Mexico and Louisiana, which means the miles you drive inside Texas carry a lighter tax charge on your quarterly return than miles logged in higher-rate states. That gap shows up clearly in any multi-state return that runs through Texas corridors — the I-10, I-20 and I-35 lanes that account for a large share of cross-country diesel mileage.
Texas Quarterly Fuel Tax Rates — Last 4 Quarters
1. Filing TX IFTA Returns: Essentials & Deadlines
2. Why Texas Shows Up on Every Fuel-Stop Map
A flat, unmoved rate is rare in the current IFTA table — several jurisdictions changed rates on July 1, 2026, but Texas did not. That stability has real planning value for fleets modeling quarterly cash flow.
Across the four quarters in the table above, the Texas diesel rate has held at $0.2000 — no seasonal adjustments, no mid-year surprises to split across a filing period. Texas also prices LNG and CNG at $0.1500 per gallon, which matters for natural-gas fleets planning lanes through the state. A fleet budgeting Texas at 20 cents will not be wrong for this quarter, and recent history suggests that assumption will hold into at least Q4 2026.
The Pub 96-336 guidebook puts the record-keeping expectation in plain terms: every trip must show the vehicle unit number, date, origin and destination, route of travel, beginning and ending odometer readings, total trip miles, and jurisdictional miles. Fuel records must show date, seller, location, product type, price and gallons. Keeping those records current prevents an auditor from substituting estimated miles — which are rarely favorable to the carrier.
For IFTA purposes the tax accrues where you burn the fuel, not where you buy it — but a low pump-plus-tax state still shortens the distance your tax-paid gallons have to stretch. Run your own lanes through the IFTA calculator on this site to see the full quarterly picture, keeping this table open beside it.
TX IFTA Tax Rates — Frequently Asked Questions
The IFTA Inc. Tax Matrix prints $0.2000 per gallon of special diesel for Texas in Q3 2026 (effective July 1, 2026). Gasoline and gasohol carry the same 20-cent rate. LNG and CNG are printed at $0.1500 per gallon.
No. The Tax Matrix flags no separate surcharge for Texas — the 20-cent rate is the complete figure, unlike states such as Kentucky or Virginia that print a separate surcharge line on top of the base rate.
Texas-based carriers file quarterly through the Texas Comptroller using the Webfile online system. Returns are due the last day of the month after each quarter ends; weekend or holiday due dates roll to the next business day.
The greater of $50 or 10 percent of the delinquent taxes — assessed for failing to file, filing late, or underpaying. Interest also applies to all delinquent amounts from the original due date.
Apply through the Comptroller’s Webfile system. Have ready: SSNs for sole proprietors, officers or directors; a Texas Taxpayer Number for registered entities; your IRP cab card or vehicle plate numbers; and your USDOT number. Paper applications use Form AP-133.
Publication 96-336 is the Texas Comptroller’s official IFTA carrier reference. It covers qualified vehicle definitions, filing procedures, amended return instructions, record-keeping requirements, and what auditors look for. It is available on the Comptroller’s website.
Not in the last four quarters. The Tax Matrix shows $0.2000 for Q4 2025 through Q3 2026. That stability is why the table above looks flat — and why it is worth re-checking every October and July when rate changes cluster across IFTA jurisdictions.
Four years of trip records (unit number, dates, origin, destination, route, odometer readings, total and jurisdictional miles) and fuel receipts (date, seller location, product type, price, gallons). Pub 96-336 sets the standard Texas auditors apply.
Done looking up rates? Run the numbers.
The rate table tells you what Texas charges per gallon. The calculator turns that into your actual quarterly return, and the mileage tracker splits your miles state by state.
Browse the full 48-state rates table