To see which fuel credits are still available, go to IRS Instructions for Form 4136 Credit for Federal Tax Paid on Fuels. Go to IRS Publication 510 Excise Taxes (Including Fuel Tax Credits and Refunds) for definitions and information on nontaxable uses.

Note that any link in the information above is updated each year automatically and will take you to the most recent version of the webpage or document at the time it is accessed.