One of the things that can affect your tax returns is the income that you report from writing in the form of royalties, advances, etc. Many of you will have literary agents and those agents will report to you what you’ve earned at the end of a year on a 1099. While the IRS says that agencies are supposed to report to their clients the gross income amount that was received, most agencies report on the net basis, and the IRS doesn’t seem to be aware of, or care about that. But as an author, you really need to know on what basis your agent is reporting income because it could potentially affect your tax return.