To amend the Internal Revenue Code of 1986 to provide tax incentives for the use of biodiesel as a fuel.

Amends the Internal Revenue Code to establish a credit to promote the production and usage of biodiesel fuel. Requires a taxpayer to obtain a certification from the producer of the biodiesel which identifies the product produced in order to utilize the credit. Imposes a tax for biodiesel not used as fuel, but for which a credit was granted. Reduces motor fuel excise taxes on biodiesel mixtures. Provides for transfers of funds from the Commodity Credit Corporation to the Highway Trust Fund in amounts equivalent to the reductions that would occur but for this Act.