Wills are the most common way for people to state their preferences about how their estates should be handled after their deaths. Many people use their wills to express their deepest sentiments toward their loved ones. A well-written will eases the transition for survivors by transferring property quickly and avoiding many tax burdens. Despite these advantages, many estimates figure that at least seventy percent of Americans do not have valid wills. While it is difficult to contemplate mortality, many people find that great peace of mind results from putting their affairs in order.

Wills vary from extremely simple single-page documents to elaborate volumes, depending on the estate size and preferences of the person making the will (the "testator"). Wills describe the estate, the people who will receive specific property (the "devisees"), and even special instructions about care of minor children, gifts to charity, and formation of posthumous trusts. Many people choose to disinherit people who might usually be expected to receive property. For all these examples, the testator must follow the legal rules for wills in order to make the document effective.

Trusts are estate-planning tools that can replace or supplement wills, as well as help manage property during life. A trust manages the distribution of a person's property by transferring its benefits and obligations to different people. There are many reasons to create a trust, making this property distribution technique a popular choice for many people when creating an estate plan.