Small Biodiesel Producer Tax Credit H.R. 6 also created a new credit for small agri-biodiesel producers equal to 10 cents per gallon on the first 15 million gallons of agri-biodiesel produced at facilities with annual capacity not exceeding 60 million gallons. Historically, small ethanol producers were allowed a similar credit. The tax credit is capped at $1.5 million per year per producer and like the small ethanol producer credit can be passed through to the farmer owners of a cooperative and the credit is allowed to be offset against the alternative minimum tax (AMT).