Let’s say you have an unincorporated sideline activity that you consider a business. Perhaps you offer photography services, create custom artwork or sell handmade items online. Will the IRS agree that your venture is a business, not a hobby? It’s an essential question for tax purposes. If the expenses from an activity exceed the revenues, you have a net loss. You may think you can deduct that loss on your personal federal income tax return with no questions asked. Not so fast! The IRS often claims that money-losing sidelines are hobbies rather than businesses — and the federal income tax rules for hobbies aren’t in your favor. TCJA made tax rules worse Old rules: Before the TCJA rules kicked in in 2018, if an activity was deemed to...