Qualified motor vehicles used/designed to transport people or property may require IFTA registration if they:
Have three or more axles
Have two axles and a gross vehicle or registered gross vehicle weight of more than 26,000 pounds or 11,797 kilograms
Are used in a combination that has a combined or registered gross vehicle weight of more than 26,000 pounds or 11,797 kilograms.
Just to confuse you… There are vehicles that fall under this definition but do not require an IFTA licence, like an intrastate vehicle.
To be licensed for tax reporting, these vehicles must use diesel, propane, or natural gas. Some jurisdictions even require gas-powered vehicles to be licensed.
Documents and applications — IFTA requirements
All carriers must keep fuel use records. Either a digital or hard copy will do. An annual licence is required for every vehicle that qualifies. Each year, your base jurisdiction may send you a reminder to file your IFTA. But the responsibility falls to each carrier to remember to apply and to store the licence properly once they get it.
Vehicles with active licences are given two decals to display. Each carrier registers a base state that their vehicles operate out of. But the single licence and one set of decals allows operation through all member jurisdictions. Only the base jurisdiction performs audits.
Why must interstate carriers file IFTA reports?
Under IFTA, carriers only need to report inter-jurisdictional fuel use to their base state. The state, in turn, will collect the taxes on net fuel use, process fuel tax returns, and distribute the funds to all the other states. The base state is also responsible for enforcing compliance through scheduled IFTA audits

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Simple ifta is Authorized IRS IFTA or International Fuel Tax Agreement Tax Filing Service Provider Simple IFTA is performs a calculation based on your mileage and fuel data provided by you. In the end, you can generate the report and submit it to your base jurisdiction.