Indiana IFTA Tax Rates for 2026 Q3
Indiana’s Q3 2026 split gasoline rate, the $0.63 special-fuel diesel rate, and exactly how the Gas Tax Holiday changes your quarterly return.
Indiana Gas Tax Holiday — Q3 2026 split rate: gasoline and gasohol file at $0.00/gal for July 1–September 5, 2026, then $0.37/gal for September 6–30, 2026. Diesel is NOT affected: $0.6300 all quarter. Source: IFTA Inc. Important Notices bulletin (Aug 18, 2026) and Indiana DOR.
Indiana IFTA Rates for Q3 2026 (Jul - Sep 2026): What Carriers Need to Know
Indiana is this quarter’s special case. Under Executive Orders 26-13, 26-16 and 26-20, the Governor’s energy emergency suspends Indiana’s gasoline use tax and gasoline excise tax through September 5, 2026. For IFTA filers that means one quarter carrying two gasoline rates — the “split rate” the Indiana Department of Revenue’s amended bulletin directs carriers to apply: $0.00 for July 1 through September 5, then $0.37 for September 6 through 30.
Diesel stays simple: $0.6300 per gallon of special fuel for the entire quarter, the rate Indiana DOR set for the fiscal year running July 1, 2026 through June 30, 2027. The IFTA Tax Matrix flags Indiana as a surcharge state, but prints one combined special-fuel figure rather than a separate surcharge line — do not add anything on top of the 63 cents. Filing $0.63 diesel and the split gasoline rate is the correct treatment for Q3 2026.
The IFTA Inc. Important Notices bulletin dated August 18, 2026 formalized the split-rate treatment and provided the specific filing instructions: carriers must prorate Indiana gasoline and gasohol miles into the pre-holiday window (July 1–September 5) and the post-holiday window (September 6–30), then apply the respective rates to each window separately. Total miles in Indiana for the quarter are the same as always — it is the rate applied to those miles that splits across the two windows.
Indiana DOR’s Motor Carrier Services (MCS) division administers IFTA for Indiana-based carriers, including account registration, credential issuance, and quarterly return processing. New accounts start with the IFTA-1A application and require a scheduled appointment with MCS — a requirement that sets Indiana apart from states that allow walk-in or fully online first-time registration.
Indiana Quarterly Fuel Tax Rates — Last 4 Quarters
1. Filing IN IFTA Returns: Essentials & Deadlines
2. Indiana’s Rates Have Been Moving Quarter to Quarter
The table above shows the drift: diesel climbed from $0.6100 to $0.6300 with Q2 2026, and the Q3 gasoline holiday is the second suspension window in six months.
Indiana raised the special-fuel diesel rate from $0.6100 to $0.6300 and the standard gasoline rate from $0.3600 to $0.3700 starting Q2 2026 — both figures confirmed by Indiana DOR’s fuel tax page for the fiscal year through June 30, 2027. If your filing templates still carry $0.61 for Indiana diesel, every gallon is being miscounted by two cents. On a 10,000-gallon Indiana quarter, that is a $200 error in accrued tax.
The Q3 gasoline split is not the first holiday window of 2026. The IFTA Inc. Fuel Tax Holiday Chart also lists an Indiana gasoline suspension running from approximately May 7 through June 30, covering Q2. That earlier window had its own amended rate bulletin. Filing a holiday quarter means reading the IFTA Important Notices page before you assume any rate — a habit worth keeping until the executive orders lapse.
Filing two separate Indiana gasoline rate windows on one return is supported by standard IFTA return instructions. The return should show Indiana gasoline miles divided between the two periods, with separate rate lines for each. If your IFTA software does not natively support split rates, the manual override approach is to file two Indiana gasoline rows — one for the 67-day $0.00 window and one for the 25-day $0.37 window — with the miles for each period assigned accordingly.
IN IFTA Tax Rates — Frequently Asked Questions
The Gas Tax Holiday: Executive orders suspend Indiana’s gasoline use tax and excise tax through September 5, 2026. Filers report $0.00 for July 1–September 5, then $0.37 for September 6–30 — the split rate from IFTA’s amended bulletin of August 18, 2026.
No. The suspension covers gasoline and gasohol only. Special fuel (diesel) stays at $0.6300 per gallon for the whole quarter — diesel filers use a single rate for the entire Q3 period.
$0.6300 per gallon of special fuel, effective from Q2 2026 and holding for the fiscal year July 1, 2026–June 30, 2027, per Indiana DOR’s Motor Carrier Services fuel tax page and the Tax Matrix.
The Tax Matrix flags Indiana as a surcharge state, but prints a single combined special-fuel rate rather than a separate surcharge line. File the $0.6300 figure as printed — do not add a surcharge on top.
File the IFTA-1A application with Indiana DOR Motor Carrier Services. New accounts require a scheduled appointment — online scheduling is available on the DOR site, or call 317-615-7200 (Monday–Friday, 8 a.m.–4:30 p.m. ET). Questions go to IndianaMotorFuel@dor.in.gov.
Yes. The DOR bulletin requires returns for all quarters affected by the Gas Tax Holiday, with all Indiana miles and gasoline purchases reported so fleet MPG calculates correctly. Keep the supporting records from the holiday window.
Use trip records to assign each Indiana gasoline mile to either the July 1–September 5 window (rate $0.00) or the September 6–30 window (rate $0.37). File two separate Indiana gasoline rows on the return. Enter them manually if your software lacks split-rate support.
The Motor Carrier Fuel Tax (MCFT) is Indiana’s intrastate fuel tax for carriers operating only within Indiana. Interstate carriers — those crossing into at least one other IFTA jurisdiction — use IFTA instead. A fleet with both IRP plates and Indiana-only plates licenses the whole fleet under IFTA.
Done looking up rates? Run the numbers.
The rate table tells you what Indiana 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