Glossary term
Codicil
A codicil is a separate legal document that amends, supplements, or partially revokes an existing will without replacing the entire will.
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What Is a Codicil?
A codicil is a separate legal document that amends, supplements, or partially revokes an existing will without replacing the entire will. It becomes part of the estate plan and is read together with the original will and any other valid codicils.
Codicils were historically useful because rewriting a will was cumbersome. They still exist, but many estate planners now prefer a new will when changes are significant, because multiple codicils can create confusion, inconsistency, or execution problems.
Key Takeaways
- A codicil changes an existing will without replacing the entire document.
- It usually must be executed with the same formalities required for a will under state law.
- Codicils are often used for narrow updates, such as changing an executor or specific gift.
- Multiple codicils can make an estate plan harder to administer.
- A new will may be cleaner when changes are broad, sensitive, or likely to create conflict.
How a Codicil Works
A codicil identifies the existing will, states the change, confirms the parts of the will that remain in effect, and is signed according to applicable law. Execution rules vary by state, but a codicil commonly needs witnesses and the same level of care as the will itself.
Once valid, the codicil and will operate together. If the codicil changes the personal representative, the original will remains in place except for that change. If the codicil revokes a gift, the rest of the will may remain effective unless the documents conflict more broadly.
Common Uses
Change | Codicil Use |
|---|---|
Executor update | Replacing a deceased or unavailable executor. |
Specific gift | Adding, removing, or changing a bequest. |
Name or address detail | Clarifying identifying information. |
Small administrative update | Adjusting a narrow provision without rewriting the will. |
Financial and Estate-Planning Effects
A codicil can change who receives property, who controls administration, and how estate costs or taxes are handled. Even a short codicil can have large financial effects if it changes a beneficiary, fiduciary, or distribution formula. That is why handwritten edits, informal notes, or unsigned instructions can be dangerous.
Executors and beneficiaries may need to locate both the will and all codicils. A missing codicil can distort the estate plan. A poorly drafted codicil can create ambiguity over whether an old provision was replaced, partly changed, or left in place.
Codicil Versus New Will
A codicil can be efficient for a simple change. A new will is often cleaner when the testator wants to change multiple beneficiaries, alter tax planning, update trust provisions, change guardians, address family conflict, or modernize old language. A new will can revoke prior wills and codicils in one coordinated document.
The risk with codicils is document layering. If a will has several amendments over many years, the estate plan may become a puzzle. That increases administrative cost and can give disappointed beneficiaries more room to contest interpretation.
Execution and Storage
A codicil should be stored with the will or in a place the executor can find. It should not be treated as a casual memo. If state law requires witnesses, notarization, or particular signing language, missing the formality can make the codicil invalid even if the intent was clear.
When someone moves to another state, marries, divorces, has children, acquires major assets, or changes estate-tax exposure, the better step may be a full estate-plan review rather than another small amendment.
The Bottom Line
A codicil is a formal amendment to an existing will. It can handle narrow updates, but because it becomes part of the estate plan, it should be executed carefully and used only when it will not make the will harder to interpret.