A will is a written legal document with instructions for distributing an individual’s assets after his or her death. A will must be formally executed as required by state law to be legally valid and enforceable.
A will is typically valid and effective until it is revoked, destroyed, or invalidated by writing a new will. Alterations to an existing will, such as crossing out language or adding a new provision, do not usually meet the legal requirements for executing a valid will and do not affect the terms of an existing will; however, changes or additions to an existing will can be made by codicil. A codicil is a document executed in compliance with applicable state law that modifies an existing will or codicil.