Definition
A codicil is a legal document that amends, supplements, or partially revokes an existing will without replacing it entirely. It must be executed with the same formalities required for a will—typically signed by the testator and witnessed—so that it is read together with the original will as a single, integrated estate plan. A codicil lets a person make targeted changes without rewriting the whole document.
Legal Meaning
A codicil functions as a formal addendum to a last will and testament. Rather than discarding the original will, the codicil modifies specific provisions—such as naming a different executor, adding or removing a gift, or updating a beneficiary—while leaving the rest of the will in force. The will and the codicil are interpreted together; where they conflict, the more recent codicil generally controls because it reflects the testator's latest intent.
Crucially, a codicil is not a casual note. Because it alters a legally binding document, it must satisfy the same execution requirements as a will. In most states this means the testator must sign the codicil (or direct someone to sign at their direction and in their presence) and the signing must be witnessed by the statutorily required number of disinterested witnesses. Some states recognize holographic (handwritten) codicils under limited conditions, but the safer course is full formal execution.
Like a will, a codicil takes effect only at the testator's death and can be revoked or superseded at any time before then by a later codicil, a new will, or physical destruction with intent to revoke. After death, the codicil is admitted to probate alongside the will. Because even small drafting errors can create costly ambiguity, many estate planners now favor executing a fresh will over patching an old one with a codicil. Our estate planning overview explains how these tools work together.
Key Points
- A codicil amends an existing will rather than replacing it
- The will and codicil are read together as one integrated plan
- A codicil must meet the same execution formalities as a will
- Most states require the testator's signature and the proper number of witnesses
- Where a will and codicil conflict, the later codicil generally controls
- A codicil is best for small, isolated changes
- It can be revoked by a later codicil, a new will, or destruction with intent
- Many attorneys now recommend a new will instead of a codicil to avoid conflicts
Real-World Example
Margaret signed a valid will five years ago naming her brother as executor and leaving her coin collection to a niece. The brother has since moved overseas, and Margaret wants to name her longtime friend as executor instead. The rest of her wishes are unchanged.
Rather than rewrite the entire will, Margaret's attorney prepares a short codicil that revokes the original executor appointment, names the friend as executor, and expressly confirms that all other provisions of the will remain in effect. Margaret signs the codicil in front of two witnesses, exactly as she did with the will. At her death, both the will and the codicil are submitted to probate and read together. Because the codicil is the more recent document, the friend serves as executor, while the coin-collection gift and everything else in the will stand unchanged.
Codicil vs. New Will
| Consideration | Codicil | New Will |
|---|---|---|
| Best For | Small, isolated changes | Major or multiple changes |
| Execution Formalities | Same as a will (signature and witnesses) | Same as a will (signature and witnesses) |
| Risk of Conflict | Higher—two documents must be read together | Lower—one clean, integrated document |
| Effect on Old Will | Amends specific provisions only | Revokes prior wills if it so states |
| Probate | Will and codicil admitted together | Single document admitted |
| Clarity | Can create ambiguity if poorly drafted | Generally clearer and easier to interpret |
Common Uses and Cautions
Codicils serve specific, limited purposes, and they carry some risks.
Typical Reasons for a Codicil
- Changing the named executor or successor executor
- Adding, removing, or adjusting a specific bequest
- Updating a guardian nomination for minor children
- Correcting a minor error, such as a misspelled name
- Reflecting a change in circumstances like a move or a new asset
Risks to Watch For
The chief danger of a codicil is inconsistency. If the codicil's language conflicts with the will or with a prior codicil, the resulting ambiguity can spark a will contest and delay probate. Multiple codicils layered over the years can become especially confusing. Improper execution is another frequent problem—an unwitnessed or improperly signed codicil may be thrown out, leaving the original will in effect and frustrating the change the testator intended.
Revoking a Codicil
A testator can revoke a codicil the same way they revoke a will: by executing a later document that revokes it, by making a new will, or by physically destroying it with the intent to revoke. Simply crossing out provisions without following the proper formalities may not be effective.
When You Need a Lawyer
An estate planning attorney can help you decide between a codicil and a new will and ensure your changes are valid when you:
- Want to update your executor, guardian, or a specific gift
- Have experienced a major life change such as marriage, divorce, birth, or death
- Are unsure whether your existing will still reflects your wishes
- Have already made one or more codicils and worry about conflicts
- Need to confirm your documents meet your state's execution formalities
- Want to coordinate your will with trusts and other estate planning tools
Because an invalid or conflicting codicil can undo your intentions, professional drafting is a small investment that protects the entire plan.
Related Terms
Need to Update Your Will?
An estate planning attorney can prepare a valid codicil or a fresh will for you
Explore Estate PlanningFrequently Asked Questions
What is a codicil to a will?
A codicil is a separate legal document that changes, adds to, or revokes part of an existing will without rewriting the entire will. It is read together with the original will, and the two documents operate as one. Codicils are commonly used for small updates, such as changing an executor or adjusting a specific gift, while leaving the rest of the will intact.
Does a codicil have to be signed and witnessed like a will?
Yes. A codicil generally must be executed with the same formalities as a will, which in most states means it is signed by the testator and witnessed by the required number of witnesses. Because a codicil amends a binding legal document, courts hold it to the same standards. If the formalities are not followed, the codicil may be invalid even if the change clearly reflects the testator's wishes.
When should I use a codicil instead of a new will?
A codicil is best for small, isolated changes, such as updating an executor, adding a single bequest, or correcting a minor error. For significant changes, multiple revisions, or anything that could create inconsistencies, drafting a new will is usually safer. Many attorneys now recommend a new will rather than a codicil because word processing makes it easy to produce a clean, single document that avoids conflicts.
Can a codicil be challenged or revoked?
Yes. A codicil can be contested on the same grounds as a will, including lack of capacity, undue influence, fraud, or improper execution. A codicil can also be revoked by the testator through a later codicil, a new will, or physical destruction with the intent to revoke. Because a codicil is part of the overall testamentary plan, a successful challenge to it can affect how the entire estate is distributed.
What happens if my codicil conflicts with my will?
When a validly executed codicil conflicts with the original will, the codicil generally controls because it is the more recent expression of the testator's intent. Provisions of the will that are not changed by the codicil remain in effect. Conflicting or poorly drafted codicils, however, can create ambiguity that leads to disputes in probate, which is why careful drafting and, often, a new will are preferred.