Grandparents love helping their grandkids financially, whether it is a birthday check, help with college tuition, or money for a first home. But what feels like a generous family gesture can sometimes create unexpected paperwork, tax reporting issues, or long-term estate planning problems. The good news is that most gifts do not trigger an immediate tax bill, but understanding the rules matters. Knowing how grandparent gift tax rules work can help families avoid costly mistakes while still supporting the next generation.