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. And the Executor Is The right executor may help ensure the distribution of your assets is done with as little upheaval as possible. What Is My Life Expectancy? Estimate how many years you may need retirement assets or how long to provide income to a surviving spouse or children.