Codicil to a Will: How to Amend Your Will

You wrote your will years ago, and most of it still reflects what you want. Then something changes. The executor you named has moved across the country, a grandchild is born, or you sell the house that a specific clause left to a specific person. You don't need to start over. You need a codicil.

A codicil is the legal tool for amending a will without rewriting it. Done correctly, it slots cleanly into your existing estate plan. Done carelessly, it creates contradictions that can tie up your estate in probate court. This guide walks through what a codicil can change, how to sign one so it holds up, the mistakes that get codicils thrown out, and when you're better off drafting a new will instead.

What Is a Codicil?

A codicil is a written document that amends, adds to, or revokes part of an existing will. It works alongside the original will rather than replacing it. When you die, the probate court reads the will and any valid codicils together as a single set of instructions.

The word comes from the Latin codicillus, meaning a short writing. That's the idea: a codicil handles a narrow change, while the will remains the main document. If your will leaves everything to your spouse and names your brother as executor, a codicil might change only the executor to your daughter. Everything else in the will stays exactly as written.

Because a codicil carries the same legal weight as the will it amends, it has to be executed with the same formality. A note scribbled in the margin of your will or a signed letter tucked into a drawer usually won't qualify. The law treats amending a will as seriously as making one.

What a Codicil Can and Can't Change

Codicils are flexible, but they work best for discrete, unambiguous changes.

Good uses for a codicil

• Naming a new executor or successor executor after the original one dies, moves, or declines to serve
• Changing a guardian for minor children
• Adjusting a specific gift, such as leaving a piece of jewelry or a sum of money to a different person
• Adding a beneficiary, like a new grandchild or a charity
• Removing a beneficiary who has passed away or from whom you've become estranged
• Updating names or addresses after a marriage, divorce, or move
• Correcting a small error in the original will, such as a misspelled name

When a codicil is the wrong tool

A codicil is not the place for sweeping change. If you're rethinking how the whole estate is divided, restructuring around a trust, or responding to a major life event like a divorce or remarriage, a codicil creates more problems than it solves. Each amendment has to be read against the original text, and the more you change, the more likely two clauses will conflict.

Some states also restrict what a codicil can do with jointly owned property or assets that pass outside the will, such as retirement accounts and life insurance policies with named beneficiaries. Those assets are controlled by beneficiary designations, not by your will or any codicil, so updating them means contacting the account custodian directly.

Codicil vs. Writing a New Will

The choice between a codicil and a new will comes down to scope.

A codicil makes sense when:

• You have one or two simple changes
• The changes don't contradict other parts of the will
• The original will is still fundamentally sound

A new will makes sense when:

• You're making several changes at once
• The changes affect how the estate is divided overall
• You've already added one or more codicils (stacking them gets messy)
• A major life event has changed your intentions

Historically, codicils existed because retyping an entire will on a typewriter was tedious and expensive. That's no longer true. Today, drafting a fresh will is often just as fast as writing a codicil, and it produces one clean document instead of two or three that a court has to reconcile. Many estate attorneys now lean toward a new will for anything beyond the smallest change. If you do decide the will needs a broader overhaul, our guide on changing a will after signing covers the full process.

How to Write a Codicil: Step-by-Step

Step 1: Identify yourself and the original will

Start by stating your full legal name and address, and identify the will you're amending by its date: "This is a codicil to my Last Will and Testament dated March 12, 2020." This ties the codicil unmistakably to the correct document. If you've made prior codicils, reference them too.

Step 2: Declare your capacity and intent

Include a sentence confirming that you are of sound mind and making the codicil freely, without pressure from anyone. This mirrors the language in a will and helps counter any later claim that you were coerced or incapacitated.

Step 3: State the changes clearly

Reference the exact clause you're changing by its article or paragraph number, then state what happens to it. Use plain, direct language:

• To revoke a clause: "I revoke Article IV, Paragraph 2 of my Will in its entirety."
• To replace a clause: "I revoke Article III and replace it with the following: ..."
• To add something new: "I add the following provision to my Will: ..."

Spell out names, amounts, and relationships in full. Ambiguity is what gets estates litigated.

Step 4: Confirm the rest of the will stands

Add a clause stating that, except for the changes made in the codicil, you ratify and confirm your original will in all other respects. This makes clear you intend the untouched portions to remain in force.

Step 5: Sign and date in front of witnesses

Sign and date the codicil in the presence of witnesses, following your state's rules (covered in the next section). The date matters: if two documents conflict, the later-dated one usually controls.

Step 6: Store it with the will

Keep the signed codicil with the original will, not in a separate location. A codicil the executor never finds does nothing. Tell your executor where both documents are, and consider giving a copy to your attorney.

Signing and Witnessing Requirements

A codicil has to be executed with the same formalities as a will, and those formalities are what make it legally valid.

Witnesses. Most states require two adult witnesses. They must watch you sign the codicil (or watch you acknowledge your signature), then sign it themselves. Critically, witnesses should be disinterested, meaning they don't inherit anything under the will or codicil. A beneficiary who serves as a witness can, in many states, forfeit their gift or cast doubt on the whole document.

Notarization and self-proving affidavits. A codicil generally doesn't have to be notarized to be valid. But you can attach a self-proving affidavit, a notarized statement signed by you and the witnesses confirming the codicil was properly executed. This spares your executor from having to locate the witnesses years later to testify in probate. It's a small step that saves real hassle.

Capacity. You must have testamentary capacity when you sign, meaning you understand you're amending your will, you know roughly what you own, and you recognize who your beneficiaries are. Signing while seriously ill or under heavy medication invites challenges.

Requirements vary from state to state, so confirm your local rules before you sign. Holographic (handwritten) codicils are accepted in some states without witnesses but rejected in others.

What a Simple Codicil Looks Like

Seeing the structure makes the pieces click. A basic codicil to change an executor might read like this:

FIRST CODICIL TO THE LAST WILL AND TESTAMENT OF JANE A. DOE

I, Jane A. Doe, of Austin, Texas, declare this to be the First Codicil to my Last Will and Testament dated March 12, 2020. I am of sound mind and make this codicil freely.

First: I revoke Article V of my Will, which named my brother, Robert Doe, as Executor.

Second: In place of the revoked provision, I appoint my daughter, Sarah Doe, as Executor of my Will. If she is unable or unwilling to serve, I appoint my sister, Linda Doe, as successor Executor.

Third: In all other respects, I ratify and confirm my Will dated March 12, 2020.

Signed this [date], in the presence of the witnesses below.

Underneath, you'd have your signature line and blocks for two witnesses, plus an optional self-proving affidavit if your state offers one. Notice how tightly it's scoped: one clause revoked, one clause added, and an explicit statement that the rest of the will stands. That precision is the whole point. Anyone reading it, including a probate judge, can see exactly what changed and what didn't.

Compare that to a codicil that tries to do too much: changing the executor, redistributing three gifts, and adding a trust provision all at once. By the third amendment, you're no longer clarifying the will, you're rebuilding it in a separate document. That's the signal to write a new will instead.

Common Mistakes to Avoid

Stacking too many codicils. Each codicil adds a document the court must read against the will. After two or three, the estate becomes a puzzle. If you're on your second codicil, write a new will instead.

Creating contradictions. If a codicil leaves the car to your son but an untouched clause in the will leaves the same car to your daughter, you've handed the court a dispute. Always check the codicil against the full text of the will before signing.

Using a beneficiary as a witness. This is one of the most frequent and costly errors. It can void the witness's inheritance or expose the document to a challenge. Choose neutral witnesses.

Failing to reference the original will. A codicil that doesn't clearly identify the will it amends can be treated as a standalone document or ignored entirely.

Storing the codicil separately. If the executor finds the will but not the codicil, your changes never take effect. Keep them together.

Trying to amend non-probate assets. A codicil can't override a beneficiary designation on a 401(k), IRA, or life insurance policy. Those pass outside the will regardless of what any codicil says.

After You Sign: Keeping Your Estate Plan Current

A codicil is one piece of a larger plan. Once it's executed, review the rest of your documents to make sure everything lines up. If you changed an executor, confirm that the person you named is willing and able to serve, and understands what the role involves. Our overview of executor and trustee duties explains what you're asking of them.

It's also worth revisiting who inherits and how. If your codicil added or removed a beneficiary, check that the change doesn't unintentionally disinherit someone or leave a gift undefined. The guide to common types of beneficiaries in a will is a useful reference, and if you're weighing how assets move through probate, avoiding probate strategies covers tools that work alongside a will.

Estate plans aren't meant to sit untouched for decades. Marriages, births, deaths, moves, and changes in what you own all warrant a fresh look. A codicil handles the small updates; a periodic review makes sure the small updates still add up to the plan you actually want.

Related guides

• How to Amend a Contract
• How to Change a Will After Signing
• Do Doctors Have to Follow a Living Will?
• Living Will vs Power of Attorney: Navigating the Differences
• Should I Make or Revise My Living Will for COVID-19 Care?

Generate Your Codicil with Contractable

A codicil is a short document, but the formalities around signing, witnessing, and referencing the original will are where people slip up. Contractable drafts a clean, properly structured codicil that identifies your existing will, states your changes in unambiguous language, and includes the signature and witness blocks your state expects. You answer a few questions, and you get a document ready to sign, no legal background required.