While it is definitely a good idea to consider hiring one, especially if you have no absolutely no knowledge on taxes, you do not definitively need an accountant or tax preparer to file your affiliate marketing taxes. You can use online resources such as tax calculators that are available for free. Alternatively, you can use a program (such as Turbotax) or a spreadsheet that will automatically calculate everything for you. Just make sure to keep track of all income and expenses!