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

H.R. 4843 aims to encourage the production and use of biodiesel by creating new federal tax credits for businesses that produce or use this renewable fuel. The bill would lower the cost of biodiesel mixtures by reducing the excise taxes typically applied to motor fuels, potentially making cleaner energy options more affordable at the pump. Additionally, the legislation includes a mechanism to ensure that the Highway Trust Fund remains fully funded despite these tax reductions, protecting the budget used for road and infrastructure repairs.