What Is a Codicil to a Will? How to Update Your Will in 2026

Life does not stand still after you sign a will. A grandchild is born, an executor moves away, a charity becomes important to you, or a beneficiary changes their name. The instinct is to reach for the whole document and start over. In many cases you do not have to. A short amendment called a codicil can make the change — if you follow the same legal rules that made the original will valid.

This guide explains what a codicil is, when it is the right tool and when it is a trap, the formalities that make one enforceable in 2026, how it differs from a new will or a living trust, and the mistakes that quietly invalidate an amendment.

What Is a Codicil to a Will?

A codicil is a formal amendment to an existing will. It does not replace the will; it modifies, adds to, or revokes specific provisions of it. Once properly executed, the codicil carries the same legal weight as the will itself and is read alongside it during probate.

Three characteristics define a valid codicil:

It is subordinate to the will. The original will remains the governing document; the codicil only changes the parts it specifically addresses.
It must reference the will it amends. A codicil that does not identify the original will by date can create ambiguity about which document it modifies — and ambiguity is what probate litigation is made of.
It must be executed with the same formalities as a will. The law will not accept a lower standard for an amendment than for the document it changes.

One practical point families overlook: keep the codicil with the original signed will. If the codicil is filed somewhere else and nobody finds it, the estate is administered as though it never existed.

When a Codicil Makes Sense — and When It Does Not

A codicil is a tool for narrow edits. Used outside that range, it creates more risk than it removes. The table below draws the line.

Change You Want to Make	Codicil Is Appropriate	Write a New Will Instead
Rename an executor after they move or decline	Yes	—
Update a beneficiary’s last name after marriage or divorce	Yes	—
Add a modest gift to a charity or a new grandchild	Yes	—
Change the guardian named for minor children	Yes, if isolated	If combined with other changes
You got married, divorced, or had a new child	—	Yes
You moved to a different state	—	Yes
You want to disinherit an heir or remove a living beneficiary	—	Yes
Several provisions need to change at once	—	Yes
You already have two or more codicils	—	Yes
Your assets or estate size changed substantially	—	Yes

The pattern is simple: one or two isolated edits favor a codicil; anything touching marital status, children, domicile, or the overall plan favors a clean rewrite. A stack of codicils is a well-known probate hazard because later amendments can contradict earlier ones and the court must guess at intent.

Legal Requirements for a Valid Codicil

Requirements vary by state, but the core elements are consistent:

In writing. An oral instruction to change a will has no effect in virtually every state. A few jurisdictions accept digital or electronic documents, but treat those as the exception.
Signed by the testator. You must sign it yourself, or direct someone else to sign in your presence if you are physically unable.
Two disinterested witnesses. Most states require two witnesses who are not beneficiaries under the will or the codicil. Witnesses should be able to testify later that you appeared competent and acted voluntarily.
Clear reference to the original will. State your full name, identify the codicil as an amendment, and cite the date of the will it changes.
Plain, unambiguous language. Describe exactly which clause you are revoking and what replaces it, ideally using the will’s own numbering.
Notarization where required. Some states require a notary or a self-proving affidavit, which lets the will and codicil be admitted without witness testimony later.
Voluntariness. The codicil must be your free act, without undue influence or coercion. Courts scrutinize amendments made late in life or while you are dependent on a caregiver.

If any element is missing, the codicil can be declared invalid, and the will is then carried out exactly as originally written — as though the amendment never existed.

Codicil vs. New Will vs. Living Trust

A codicil is one of three ways to change your plan. Each has a different cost, risk profile, and effect on probate.

Approach	Typical Cost (2026)	Effort	Probate Effect	Best For
Codicil	$75 – $400	Low; one short document	None — still probated	One or two isolated edits
New will	$300 – $1,500	Moderate; full redraft and re-execution	None — still probated	Marriage, divorce, children, moves, multiple changes
Living trust	$1,500 – $3,500	High; must fund the trust	Avoids probate entirely	Large or complex estates, privacy, incapacity planning
Holographic will	$0 – $100	Handwritten, signed, dated	None — still probated	Emergency use only where state permits

The trade-off is clarity versus effort. A codicil saves money but leaves you with two documents that must agree. A new will costs more but leaves a single coherent instrument. A living trust costs the most but removes the estate from probate altogether — which matters most when privacy or speed is the priority. For an unexecuted handwritten alternative, see holographic wills and their limits.

How to Write a Codicil: Step by Step

You can draft a simple codicil yourself, though a brief attorney review is cheap insurance. The sequence:

Review the original will. Read it in full and list precisely which provisions you want to change. A codicil cannot fix a will you have not re-read.
Open with identification. State your full legal name, your city and state, and the date of the will you are amending. Example: “I, [name], amend my will dated [original date] as follows.”
Revoke the old clause explicitly. Quote or cite the clause you are removing, then state the replacement in the same numbering used in the will.
Sign and date in front of witnesses. Sign in the presence of two disinterested witnesses, who each sign. Follow your state’s notarization rule.
Attach it to the original will. Store the codicil with the signed original, tell your executor where it is, and give a copy to your attorney.
Consider a self-proving affidavit. If your state allows it, notarizing the signatures now avoids needing witness testimony at probate later.

Common Mistakes That Invalidate a Codicil

These are the failure modes courts see most often:

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Naming a witness who is also a beneficiary. In many states this voids that witness’s gift or puts the codicil’s validity in question.
Failing to reference the original will by date. Without the reference, the court may not know which document the codicil modifies.
Contradicting an earlier codicil. Each amendment should reconcile with prior ones or expressly revoke them.
Signing without witnesses or a notary. An unwitnessed amendment is not a valid codicil in nearly every state.
Making major changes in a minor document. Disinheriting an heir through a codicil invites a contest under a no-contest clause analysis.
Losing the original. If only a copy survives, most states presume the original was revoked.
Drafting while cognitively impaired. Capacity challenges rise sharply with age; get a contemporaneous medical note if capacity could be questioned.

State Variations to Watch in 2026

The formalities are not uniform. Three variations matter most:

Louisiana. A codicil to a notarial will must be executed before a notary and two witnesses. A codicil to an olographic (handwritten) will must itself be entirely handwritten, dated, and signed.
Holographic states. Where handwritten wills are recognized, a handwritten codicil may be valid without witnesses, but it must be entirely in the testator’s hand — any typed or preprinted portion can invalidate it.
Self-proving affidavit states. A growing number of states let you attach a notarized affidavit at signing so the will and codicil are admitted without witnesses appearing in court.

Because these rules differ so much, confirm your state’s requirements before executing anything. A pour-over will is a related instrument that works alongside a trust, and it too must meet the same formality standard.

Watch: What Is a Codicil?

This short explainer covers what a codicil does, when it is used, and why it must be executed the same way as the underlying will.

Frequently Asked Questions

What is a codicil to a will?

A codicil is a formal amendment to an existing will. It modifies, adds to, or revokes specific provisions without replacing the will itself, and it must be executed with the same legal formalities as the will.

Does a codicil have to be notarized?

It depends on your state. Many states require witnesses and allow, but do not require, a notary or self-proving affidavit. Some states require notarization or a specific number of witnesses. Louisiana requires a notarial will’s codicil to be executed before a notary and two witnesses.

How much does a codicil cost in 2026?

A simple attorney-drafted codicil typically costs $75 to $400, compared with $300 to $1,500 for a new will and $1,500 to $3,500 for a living trust. Do-it-yourself forms are cheaper but carry more execution risk.

Can I write my own codicil?

Yes, in most states, provided you sign it in front of two disinterested witnesses and satisfy any notarization requirement. Because a defective execution voids the amendment, a short attorney review is inexpensive insurance.

When should I write a new will instead of a codicil?

Write a new will if you married or divorced, had or adopted a child, moved to another state, want to disinherit an heir, need several changes at once, or already have multiple codicils. A codicil is for one or two isolated edits.

Can a codicil be contested?

Yes. Heirs can challenge a codicil for lack of capacity, undue influence, improper execution, or ambiguity. A properly witnessed and notarized codicil that clearly references the original will is far harder to overturn.

How many codicils can I have?

There is no legal maximum, but two or more codicils create a real risk of conflicting instructions. If you need a second or third amendment, replacing the will with a single coherent document is usually the safer choice.

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