I would use Schedule F, which is the best form for Farmers and Fishermen.  While some of the expense item lines will not be applicable, there is Line 32: Other Expenses where you can list anything that doesn't fit lines 10 through 31 by category of expense.  Fishing business refers to the catching, taking or harvesting of finfish, mollusks, crustaceans, marine animal and plant life, except marine mammals and birds. You also have the choice to use Schedule J, Income Averaging and possibly reduce what could be the tax liability for the current year.  Yes, income from fishing is considered self-employment and is subject to self employment tax. Using Sch F will allow you to flow from 1099-G to Schedule F seamlessly and be the correct form to use.