A bill for an act modifying the sales or use tax refund for biodiesel production.

This bill increases Iowa's tax refund for biodiesel producers from 4 cents to 5 cents per gallon of biodiesel produced. It directly affects biodiesel manufacturers in Iowa by raising their quarterly refund amount based on total annual production. The refund calculation method remains unchanged - multiplying gallons produced by the rate - but extends the program's expiration from January 1, 2028, to January 1, 2031. The bill modifies existing tax provisions without altering eligibility or production requirements.