It is certainly not a Sch A charitable contribution deduction. If you feel it is ordinary, necessary and customary and are inclined to make it a deduction, it would be more appropriate as a business expense. Pick the category for which you feel it most closely fits your situation best, in other words is it: professional development that would include continuing education and learning, dues/subscriptions/memberships, software & its licensing if your use is more closely is associated with setting up and utilizing the tax software, books/library/research type items, miscellaneous?