In the United States, a vehicle may be considered a commercial vehicle if:
It is titled or registered to a company or a corporation.
Is used for business, but is under the name of a sole proprietor for that business.
Is a leased vehicle and in the name of the financial institution that owns it.
Exceeds a certain weight or class, even if it is not used commercially or company owned. Generally, any vehicle with a weight rating of 26,001 pounds or more is considered a commercial vehicle, regardless of use or ownership.
Is used in the transportation of hazardous materials.
Note that a vehicle used for business may remain privately licensed depending on the amount of time it is used for business.