Mobile Machinery Tax Fairness Act

This bill, introduced in 2003, sought to change how certain heavy equipment is taxed by the federal government. It proposed that "mobile machinery"—such as specialized vehicles used for construction, farming, or drilling—should not be classified as highway vehicles, even if they are capable of driving on public roads.

The practical impact of this change would be to exempt these vehicles from federal highway excise taxes, which are typically used to fund road repairs. Proponents of the bill argued that because these machines spend the vast majority of their time working on job sites rather than driving on highways, owners should not have to pay taxes intended for regular road users. While the bill was referred to the House Committee on Ways and Means, it did not advance further during that session of Congress.