Years ago, Congress enacted the “kiddie tax” rules to prevent parents and grandparents in high tax brackets from shifting income (especially from investments) to children in lower tax brackets. And while the tax caused some families pain in the past, it has gotten worse today. That’s because the Tax Cuts and Jobs Act (TCJA) made changes to the tax rate structure. These changes may mean the "kiddie tax" hurts families more than ever. History of the tax The kiddie tax used to apply only to children under age 14. This provided families with plenty of opportunity to enjoy significant tax savings from income shifting. In 2006, the tax was expanded to children under age 18. And since 2008, the kiddie tax has generally applied to children under...