A codicil is a formal document that changes, adds to, or republishes part of an existing will.
In plain language, it is an amendment to a will rather than a completely new will. It usually must satisfy the legal formalities required for will changes.
Why it matters
Codicils matter because small changes to a will still need legal care. A poorly executed codicil can create confusion about which provisions control, whether the will was validly changed, or whether older language remains in effect.
The term is common when a person wants to update beneficiaries, executors, gifts, or instructions.
Where it appears
Codicils appear in estate-planning files, probate proceedings, will contests, beneficiary disputes, and document-review checklists.
Practical example
A testator signs a codicil changing the executor named in an earlier will while leaving the rest of the will unchanged.
How it differs from nearby terms
A codicil differs from a will. The will is the main testamentary document; the codicil amends it.
It also differs from a pour-over will, which directs property into a trust.
Related terms
Quick knowledge check
Question: What does a codicil do?
Answer: It formally amends or adds to an existing will.