What is the Difference Between a Will and a Codicil? A last will and testament, often simply referred to as a “will,” is a legal document that outlines the distribution details of one's possessions, including investments and other interests, upon their death. A codicil is used to update and amend a will.

Does a codicil override a will?

A codicil is a legal document that is used to make specific changes to a last will and testament. Codicils should be used for minor changes. But if they are unclear, they could invalidate the entire will. Anything beyond the correction of a name or other small changes is likely better served by creating a new will.

Should I do a codicil or a new will?

To determine if a client should use one, Randall uses this simple litmus test: “If the testator is just making one or two simple changes, then a codicil is the best way to go,” she says. “But if they're going to be making six, seven, eight changes, […] they might as well just get a brand new will.