You've committed to a life partner but aren't legally married. For you, a will is essential if you want your property to pass to your partner at your death. Without a will, state law directs that only your closest relatives will inherit your property, and your partner may get nothing. If you share certain property, such as a house or car, you may consider owning the property as joint tenants with rights of survivorship. That way, when one of you dies, the jointly held property will pass to the surviving partner automatically.