Hawaii Fuel Tax Compliance and Reporting Requirements

Hawaii is not a member of the International Fuel Tax Agreement (IFTA). Because the state is an island chain with no land borders connecting to other U.S. states or Canadian provinces, the reciprocal tax collection system used by the 48 contiguous states does not apply. Instead, motor carriers operating in Hawaii must comply with the Hawaii Revised Statutes (HRS) Chapter 243, which governs the taxation of liquid fuels. All fuel consumed within the state is subject to both federal and state taxes, as well as specific county-level surcharges that vary significantly between Honolulu, Maui, Kauai, and Hawaii County. Motor carriers must manage their fuel expenses and tax liabilities through the Hawaii Department of Taxation (DOTAX). While you do not need an IFTA decal to operate within the islands, you must still maintain rigorous records of fuel purchases and mileage for state audit purposes and federal heavy vehicle use tax compliance. DispatchTool simplifies this process by allowing operators to digitize fuel receipts and track precise mileage within each county, ensuring that local surcharges are accounted for during quarterly settlements. Create a DispatchTool account to centralize your Hawaii fuel records and expense tracking.

Exclusion from IFTA and IRP

Hawaii is the only U.S. state that does not participate in the International Fuel Tax Agreement (IFTA) or the International Registration Plan (IRP). Under the federal definition provided by the IFTA Articles of Agreement, a 'Member Jurisdiction' must be a state of the United States, the District of Columbia, or a province or territory of Canada. Since Hawaii has no interstate highway connections, there is no risk of fuel tax evasion through cross-border travel. Consequently, trucks registered in Hawaii do not require IFTA stickers or cab cards, and out-of-state carriers cannot 'drive' into Hawaii, negating the need for trip permits or reciprocity agreements.

State and County Liquid Fuel Tax Rates

Fuel taxes in Hawaii are composed of three distinct layers: the federal excise tax, the state liquid fuel tax, and the county fuel tax. As of 2024, the state tax rate for diesel is $0.16 per gallon. However, the county surcharges add a significant burden. For example, the City and County of Honolulu adds $0.165 per gallon, Maui adds $0.23, Hawaii County adds $0.23, and Kauai adds $0.17. When combined with the federal diesel tax of $0.244 per gallon, carriers in Maui can expect to pay a total tax of approximately $0.634 for every gallon of diesel pumped at the terminal or retail station.

Hawaii DOTAX Form M-18 Reporting

Liquid fuel distributors and certain large-scale consumers are required to file Form M-18, the Monthly Return of Liquid Fuel Tax, with the Hawaii Department of Taxation. This form must be filed by the 20th day of the month following the reporting period. While most small fleet owner-operators pay the tax at the pump, those who maintain bulk storage tanks or import fuel must report every gallon. Failure to file or pay the required tax can result in a penalty of 5% per month of the unpaid tax, up to a maximum of 25%, as specified under HRS Section 231-39.

Record Keeping for Audit Compliance

Even without IFTA, Hawaii motor carriers must maintain detailed records for at least 3 years to satisfy Department of Taxation audits. These records must include the date of purchase, the name and address of the seller, the number of gallons purchased, and the specific vehicle into which the fuel was placed. Because the tax rates differ between the four major counties, carriers moving equipment via barge between islands must document the specific county where the fuel was consumed to ensure the correct local surcharge was applied. Documentation must be clear and legible to avoid the disallowance of tax-paid credits.

Off-Highway Fuel Tax Refunds

Under Hawaii Revised Statute 243-7, motor carriers may be eligible for a refund of a portion of the liquid fuel tax if the fuel was used for off-highway purposes. This typically applies to power take-off (PTO) units, such as those used on concrete mixers or refrigerated trailers (reefers) while idling at a facility. The refund is generally the difference between the highway fuel tax and the 1-cent-per-gallon off-highway rate. Carriers must submit Form N-188 to the Department of Taxation to claim these refunds, providing evidence of the gallons consumed while not on public roads.

Federal Heavy Vehicle Use Tax (Form 2290)

While Hawaii is exempt from IFTA, vehicles with a gross weight of 55,000 pounds or more are still subject to the Federal Heavy Vehicle Use Tax (HVUT). The Internal Revenue Service (IRS) requires the filing of Form 2290 annually between July 1 and August 31. The tax amount starts at $100 plus $22 per 1,000 pounds over 55,000, capping at $550 per year for vehicles over 75,000 pounds. Hawaii fleet owners must provide a stamped Schedule 1 as proof of payment when renewing their commercial vehicle registrations with the local county DMV.

Sources

Hawaii Department of Taxation (2024) — https://tax.hawaii.gov/forms/a1_b2_3fuel/ International Fuel Tax Association (2025) — https://www.iftach.org/manuals/2025/Articles%20of%20Agreement%20February%202025.pdf Internal Revenue Service - Form 2290 (2024) — https://www.irs.gov/instructions/i2290

Frequently asked

Do I need an IFTA sticker to drive a commercial truck in Hawaii?

No, Hawaii does not participate in IFTA. You do not need to display IFTA decals or carry an IFTA license, as the state has no land borders with other jurisdictions.

What is the total tax per gallon of diesel in Honolulu?

In Honolulu, the total tax is approximately $0.569 per gallon, which includes the $0.16 state tax, the $0.165 county tax, and the $0.244 federal excise tax.

How long should I keep my fuel receipts in Hawaii?

You should keep all fuel receipts and mileage records for at least 3 years to remain compliant with Hawaii Department of Taxation audit requirements.

Is reefers fuel taxed differently in Hawaii?

Yes, fuel used for non-highway purposes like refrigeration units may be eligible for a refund of the highway portion of the tax, reducing the state rate to 1 cent per gallon via Form N-188.