When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Share | Related Content When Special Care Is Needed: The Special Needs Trust A special needs trust helps care for a special needs child when you’re gone. When Heirs are Imperfect The money problems or bad lifestyle habits of adult children could lead to the squandering of any inheritance they receive. Principles of Preserving Wealth How federal estate taxes work, plus estate management documents and tactics.