When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Share | Related Content Estate Management 101 A will may be only one of the documents you need—and one factor to consider—when it comes to managing your estate A Living Trust Primer Living trusts are popular, but their appropriateness will depend upon your individual needs and objectives. What's My Potential Estate Tax? This calculator helps estimate your federal estate tax liability.