What Is a Codicil to a Will? (2026 Guide)

What Is a Codicil to a Will?

A codicil is a formally executed legal document that amends specific provisions of an existing will without replacing the whole document. It must satisfy the same execution formalities as a new will — typically your signature plus two adult disinterested witnesses. A validly executed codicil carries the same legal authority as the original will and is read alongside it as a single testamentary plan during probate.

Key takeaways

• A codicil amends specific provisions of your will without revoking the whole document, but it must be signed and witnessed with the same formalities as a new will in almost every state.
• Signing a codicil legally "republishes" your entire will as of the codicil's execution date — a hidden re-dating that can shift anti-lapse calculations, allow incorporation of newer documents by reference, and potentially revive a prior revoked will.
• Louisiana is the only U.S. state that requires both two witnesses and a notary (La. Civ. Code Art. 1577). Colorado allows a notary to substitute for two witnesses (Colo. Rev. Stat. § 15-11-502).
• When you have two or more existing codicils, estate planning practitioners recommend restating everything in a single new will to prevent contradictions and executor confusion.
• A codicil stored separately from the original will may be treated as if it never existed by a probate court.

The Hidden Legal Consequence Nobody Mentions: Republication by Codicil

Every article about codicils explains what they do — amend a clause, swap a beneficiary, replace an executor. Almost none explain what a codicil silently does to the whole document the moment you sign it.

Under the common law doctrine of republication by codicil — codified in states including Florida at Fla. Stat. § 732.509 — signing a valid codicil re-executes your entire will as of the codicil's date. Courts treat the will as if it were signed on the day the codicil was signed, not on the original execution date. This invisible clock reset has three practical consequences that can directly affect who inherits.

Consequence 1: Anti-lapse statute calculations shift forward.

Anti-lapse statutes step in when a named beneficiary dies before the testator, redirecting the gift to that beneficiary's descendants in some circumstances. The statute's eligibility rules run from the will's effective date. If a beneficiary was alive when you originally signed your will but died before you signed a codicil years later, republication can reset which point in time governs the analysis. This is a narrow but real edge case — worth flagging with your estate planning attorney any time you add a codicil and a named beneficiary's circumstances have changed since the original will was signed.

Consequence 2: Documents created after the original will can be incorporated by reference.

Suppose you wrote your will in 2019 and later created a detailed tangible personal property memorandum in 2022, listing who gets specific items like jewelry, furniture, or collectibles. Under the original 2019 date, that 2022 document could not be incorporated by reference because it did not exist yet. When you sign a codicil in 2026, your will is republished to 2026 — and that 2022 document can now potentially be incorporated by reference in states that require a referenced document to exist as of the will's effective date.

Consequence 3: A previously revoked will can be accidentally — or intentionally — revived.

Under UPC § 2-509, a codicil that expressly republishes and reaffirms an older will can revive it, even if that will was previously displaced by a newer document. This is intentional when a testator wants to restore an earlier estate plan. It becomes a costly surprise when sloppy language in a codicil inadvertently references the wrong will, resurrecting a testamentary scheme the testator believed was long gone. Courts in states following the Uniform Probate Code look to the codicil's express language and the testator's evident intent when evaluating revival claims.

None of these consequences appear in any standard "what is a codicil" article. If you are weighing a codicil against writing a new will, the republication doctrine is worth understanding — and worth a conversation with your attorney — before you sign.

Codicil vs. New Will: Which One Do You Need?

The honest answer is that a codicil saves very little effort compared to a new will, because both require identical formalities: a written document, your signature, and two witnesses. The question isn't really about effort — it's about risk and clarity.

A practical cost note that surprises most people: an attorney must read and understand your entire existing will before drafting a codicil, so professional fees for a codicil often approach the cost of a fresh document. If your estate has evolved since your last will was drafted, create your will online and start with a clean, current document rather than layering amendments onto a structure that may no longer fit your life.

For a broader look at all the ways to update your estate plan, see how to change a will and how to update or revoke a will.

A Fully Worked Example: What Valid Codicil Language Looks Like

The situation: Eleanor J. Whitfield signed her will on March 14, 2019. Article III, Section 2 reads: "I give my sterling silver tea set to my sister, Margaret Chen, of San Francisco, California." Margaret died in 2023. Eleanor wants to redirect that specific bequest to her niece, Sofia Chen. Nothing else in the will needs to change.

Why a codicil is appropriate here: One isolated clause. No change to any other beneficiary, to the executor, or to the residuary distribution. The original will otherwise reflects Eleanor's current intentions.

The codicil (Colorado, November 5, 2026):

I, Eleanor J. Whitfield, of Denver, Colorado, declare this to be the First Codicil to my Last Will and Testament dated March 14, 2019.

1. Amendment. Article III, Section 2 of my Will is deleted in its entirety and replaced with the following: "I give my sterling silver tea set to my niece, Sofia Chen, of Portland, Oregon."

2. Republication. In all other respects I ratify, confirm, and republish my Last Will dated March 14, 2019.

Signed on November 5, 2026, in Denver, Colorado.

____________________ Eleanor J. Whitfield (Testator)

We, the undersigned witnesses — each at least 18 years old and not named as a beneficiary in the Will or this Codicil — declare that Eleanor J. Whitfield signed this instrument as her Codicil in our presence, and appeared to be of sound mind and free of undue influence.

Witness 1: _______________   Date: ______   Address: _______________

Witness 2: _______________   Date: ______   Address: _______________

Notice the three structural elements every valid codicil needs: (1) a precise reference to the original will's exact execution date; (2) language that specifies exactly which provision is being replaced — article number, section number, and the new text in full; and (3) a republication clause confirming everything else survives unchanged. After both witnesses sign in Eleanor's presence, she should add a notarized self-proving affidavit under UPC § 2-504, which eliminates the need for her witnesses to testify before a probate court years later.

How to Execute a Valid Codicil: Step by Step

1. Confirm you need a codicil, not a new will. Use the decision table above. If the change is isolated and doesn't cascade through other provisions, a codicil is appropriate. If you already have two codicils, strongly consider a restatement instead.

2. Obtain and carefully read the original will. You cannot accurately draft a codicil without reading the exact language — including the article number and section number — of the clause you're changing. Misquoting the reference creates an ambiguity that a probate court will have to resolve.

3. Draft the codicil. Include: your full legal name and address; the original will's exact execution date; a numbered amendment that states precisely which clause is deleted, modified, or replaced and what the new text is; and a republication clause affirming everything else remains in force.

4. Choose two disinterested witnesses. "Disinterested" means they receive no benefit under the will or the codicil. If a witness is also a beneficiary in some states, their gift — not the codicil itself — becomes voidable or void. When in doubt, choose neighbors, friends, or colleagues who are not in the will.

5. Sign in the witnesses' simultaneous presence. All three parties — testator and both witnesses — must be in the same room at the same time. Sequential witnessing (you sign, then one witness later, then the other the next day) can invalidate the document in strict-compliance jurisdictions.

6. Consider adding a self-proving affidavit. Under UPC § 2-504, a notarized affidavit signed by the testator and both witnesses converts the codicil into a self-proving instrument that probate courts can admit without calling witnesses to testify. This is the one step that requires a notary in most states. It is optional but strongly recommended — witnesses become hard to locate as years pass.

7. Attach the codicil to the original will and store both together. Physically attach the codicil or place it in the same envelope or secure location as the will. Tell your executor exactly where both documents are. See will safekeeping: where to store your will for storage best practices. A codicil that cannot be found is, legally, a codicil that does not exist.

Pactlio Wills generates a complete, state-specific will draft with built-in execution guidance for all 50 states, so you start with the right foundation before you ever need to think about amendments.

Codicil Requirements by State

State laws change. If you're preparing a codicil in California, Texas, Florida, or New York, check the current witnessing rules — and read will witness requirements for a full breakdown. For the most complete picture of what your state requires, review your state's current probate code or consult an estate planning attorney.

One point that surprises people who move between states: the state where the codicil is executed (signed) governs its formal validity, not the state where the original will was drafted. If you wrote your will in California and you sign a codicil in Florida, Florida's formalities apply to the codicil.

Common Mistakes to Avoid

• Writing changes directly on the original will. Crossing out a clause, writing "void" in the margin, or initialing a correction does not legally amend a will in almost any U.S. state. Any amendment requires a separately executed codicil — or a new will.

• Using vague language about which provision is changed. "I want my niece to have the silver instead" gives a probate court nothing to work with. Cite the article number, section number, and full replacement text. Precision is the whole point of a codicil.

• Not verifying witness eligibility. A witness who stands to benefit under the will or codicil may lose their gift — or invalidate the codicil — depending on the state. Choose witnesses who have no connection to the document's dispositions.

• Skipping the self-proving affidavit. Witnesses move, die, or become impossible to locate over time. Without a notarized self-proving affidavit, the probate court may require live witness testimony to admit the codicil, which creates delays and legal costs for your family.

• Storing the codicil anywhere but with the will. A codicil in a separate drawer, a different safe, or held exclusively by an attorney who predeceases you is a codicil that may never surface. Keep the original will and all codicils together, and confirm that your executor knows exactly where they are.

• Ignoring the republication effect when it matters. If your circumstances have changed significantly since the original will was signed — a beneficiary's death, major new assets, a move to a new state — republishing the original will's terms through a codicil can lock in stale provisions. When change is broad rather than surgical, what is a will and a fresh start is almost always the cleaner answer.

Sources

• Uniform Probate Code § 2-507 (Execution; Witnessed or Notarized Wills; Holographic Wills): https://www.uniformlaws.org/committees/community-home?CommunityKey=a539920d-c477-44b8-84fe-b0d7b1a4cca8
• Uniform Probate Code § 2-509 (Revival of Revoked Will): https://www.uniformlaws.org/committees/community-home?CommunityKey=a539920d-c477-44b8-84fe-b0d7b1a4cca8
• Uniform Probate Code § 2-504 (Self-Proved Will): https://www.uniformlaws.org/committees/community-home?CommunityKey=a539920d-c477-44b8-84fe-b0d7b1a4cca8
• California Probate Code § 6111 (Holographic Wills): https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PROB&sectionNum=6111
• Texas Estates Code § 251.052 (Holographic Wills): https://statutes.capitol.texas.gov/Docs/ES/htm/ES.251.htm
• Florida Statutes § 732.502 (Execution of Wills; Codicils): https://www.flsenate.gov/Laws/Statutes/2026/732.502
• Florida Statutes § 732.509 (Republication of Wills by Codicil): https://www.flsenate.gov/Laws/Statutes/2026/732.509
• New York Estates, Powers and Trusts Law § 3-2.1 (Execution and Attestation of Wills): https://www.nysenate.gov/legislation/laws/EPT/3-2.1
• Louisiana Civil Code Article 1577 (Notarial Testament): https://legis.la.gov/legis/Law.aspx?d=109341
• Colorado Revised Statutes § 15-11-502 (Execution; Witnessed or Notarized Wills; Holographic Wills): https://leg.colorado.gov/sites/default/files/images/olls/crs2023-title-15.pdf
• Vermont Statutes Annotated 14 V.S.A. § 5 (Execution of Will; Requisites): https://legislature.vermont.gov/statutes/section/14/001/00005

This article is general information, not legal advice. Laws vary by jurisdiction. Pactlio generates professional drafts for review — have a licensed attorney review anything important.