What Is a Codicil in New York?

Clients come into my office at 15 Maiden Lane with all kinds of reasons for wanting to change their will: a new grandchild, a falling-out with a named executor, a charitable bequest they want to add, or a second thought about who should get a specific piece of jewelry. The question I hear most often is whether they need to redo the entire will or whether there is a simpler fix. In New York, that simpler fix has a name: a codicil. But "simpler" does not mean "informal." A codicil is a fully executed legal document, and if it is not signed and witnessed correctly, it can be worthless, or worse, create a mess a Surrogate's Court judge has to sort out after you are gone.

What Is a Codicil Under New York Law?

A codicil is a separate written instrument that amends, supplements, or partially revokes an existing, validly executed will. It does not stand on its own. Instead, it is read together with the original will as a single testamentary plan once both documents are admitted to probate. If you think of your will as the master document expressing your overall estate plan, a codicil is a formal edit to one or more specific provisions in that document, not a replacement for the whole thing.

New York's Estates, Powers and Trusts Law (EPTL) has no separate article devoted exclusively to codicils. Instead, codicils are governed by the same statutory framework as wills generally, most importantly EPTL 3-2.1, which sets out the execution formalities for wills, and EPTL 3-4.1, which addresses how a will can be revoked or altered. A codicil is one of the mechanisms EPTL 3-4.1 allows for changing a prior will without revoking it outright.

In practical terms, a codicil typically does one or more of the following:

• Changes or adds a beneficiary for a specific bequest
• Names a new executor, trustee, or guardian, or changes the order of succession among alternates
• Updates a specific dollar amount or item left to someone
• Adds a new provision, such as a charitable gift, that was not in the original will
• Formally revokes one clause of the will while leaving the rest intact

What a codicil does not do is rewrite your will from scratch. It operates as a targeted amendment, layered on top of a document that otherwise remains in force.

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

This is the decision point where I spend most of my time with clients, because choosing the wrong tool creates real risk. There is no bright-line statutory rule for when a codicil is appropriate versus when a new will is required. It comes down to judgment, and a few practical guideposts hold up well.

When a Codicil Makes Sense

A codicil is generally the right tool when you are making one discrete, well-defined change to a will that otherwise still reflects your intentions. Common examples include:

• Replacing an executor or successor executor who has died, moved away, or is no longer a good fit
• Adjusting a single specific bequest, such as increasing a cash gift to a grandchild
• Adding a new charitable beneficiary without disturbing the rest of the distribution scheme
• Correcting a factual error, such as a misspelled name or an outdated address, that does not affect substantive terms

In these situations, the will as a whole still works. You are not trying to overhaul your estate plan; you are making a surgical edit.

When a New Will Is the Better Choice

A full new will, sometimes drafted as a "restated will" that expressly revokes all prior wills and codicils, is usually the better approach when:

• You have already executed one or more codicils and want to make another change (stacking codicils gets messy fast)
• You have had a major life event: marriage, divorce, a new child, the death of a beneficiary or executor, or a significant change in net worth
• You want to change the overall distribution scheme, not just one gift or appointment
• Your existing will is old, was drafted in another state, or does not clearly reflect New York's execution standards
• You are revising provisions that interact, where changing one clause could create ambiguity about the rest of the document

If you are unsure which category your situation falls into, that uncertainty is itself a signal to talk to an attorney rather than guess. Our wills and trusts practice regularly handles exactly this kind of triage, reviewing an existing will to determine whether a codicil, a restatement, or an entirely new document is the right path forward.

Execution Requirements: EPTL 3-2.1 Formalities Apply to Codicils Too

This is the part people underestimate most often. Because a codicil amends a will, New York law requires it to be executed with the exact same formalities as a will itself. There is no shortcut and no handwritten note in the margins that will legally change your will. Under EPTL 3-2.1, a codicil must satisfy each of the following:

• Signed at the end. The testator must sign at the physical end of the document. A signature anywhere else does not satisfy the statute and can invalidate the entire codicil.
• Signed or acknowledged before witnesses. The testator must sign in the presence of each witness, or acknowledge that the existing signature is theirs.
• Two attesting witnesses. New York requires at least two, neither of whom should be a beneficiary under the codicil if it can be avoided.
• Witnesses sign within a 30-day window. Both witnesses must sign within thirty days of each other, at the testator's request.
• Declaration that the document is a codicil. The testator should tell the witnesses, before they sign, that the document is a codicil to their existing will.
• Attestation clause and self-proving affidavit. A well-drafted codicil includes an attestation clause and a notarized affidavit of the witnesses, making it "self-proving" so witnesses generally will not need to testify in Surrogate's Court.

These are the same formalities you would need to satisfy if you were executing a brand-new will, which is exactly why our article on New York will requirements is worth reviewing alongside this one. If you are going to go through the trouble of assembling witnesses and following statutory formalities anyway, it is worth pausing to confirm that a codicil, rather than a fresh will, is truly the more efficient route for your circumstances.

The Risks of DIY Codicils

I understand the appeal of a do-it-yourself codicil. It feels like a small change, so it seems reasonable to handle with a downloaded form or a few typed sentences stapled to the original will. In practice, this is where I see some of the most avoidable estate litigation. A few recurring problems:

• Contradicting the original will. A codicil drafted without the original will's exact language on hand can create an internal conflict, for example naming a new executor while the original alternate-executor clause is left untouched, leaving it unclear who has priority to serve.
• Revocation by inconsistency. Under EPTL 3-4.1, a later testamentary document can revoke an earlier one, in whole or in part, simply by containing inconsistent provisions, even without an express revocation clause. A poorly worded codicil meant to change one gift can accidentally revoke unrelated provisions.
• Improper execution. DIY codicils are frequently signed without two qualifying witnesses or without the 30-day attestation window being observed. If the formalities are not met, the codicil can be denied probate entirely.
• Lost or separated documents. A codicil is often a single loose page. If it becomes separated from the original will or is not stored with it, it may never be located after death, or its absence may raise questions about intentional revocation.
• Interested witnesses. Using a beneficiary as one of the two witnesses can create complications regarding that beneficiary's gift and invite unnecessary scrutiny during probate.

Every one of these problems is preventable with careful drafting and proper execution, but none of them are obvious to someone without legal training who is simply trying to update a single line in their will.

How Codicils Are Probated Together With the Original Will

When someone dies, their executor petitions the Surrogate's Court to admit the will to probate. A codicil must be offered for probate alongside the original will, and the court examines both documents as a unified whole. The codicil's witnesses, or its self-proving affidavit, establish that the codicil was validly executed, separately from the proof offered for the underlying will.

This is precisely why keeping the original will and any codicils together, in a known and secure location, matters so much. If a codicil cannot be produced or its execution cannot be proven, the court may admit only the original will and disregard the intended changes. I advise clients to store the original will and every codicil together and tell their executor where those documents are kept, since New York law presumes that a will last known to be in the testator's possession, and not found after death, was destroyed with intent to revoke it. That same presumption can complicate matters for a missing codicil.

Why Many Attorneys Prefer a Restated Will Over Stacking Codicils

In my own practice, once a client already has one codicil and is coming back for a second or third change, I almost always recommend a full restated will instead of layering on another codicil. A few reasons this approach has become the norm among experienced estate planning attorneys:

• Clarity. A single, integrated document is far easier for an executor, a court, and family members to interpret than an original will plus two or three codicils, each amending different clauses.
• Reduced litigation risk. Multiple codicils increase the chance of internal inconsistency, which invites a will contest among disappointed heirs.
• Administrative efficiency. Probating one will is simpler than probating a will plus a stack of codicils, each requiring its own proof of due execution.
• Modern circumstances change faster than they used to. Blended families, retirement accounts, and shifting tax law mean a will drafted even five or ten years ago may need more than a patch, and a restatement is a natural opportunity to review the entire plan.

None of this means a codicil is never the right answer. For a single, well-defined change to an otherwise sound and recent will, a codicil remains a legitimate, efficient tool under New York law. But it is not a substitute for periodically reviewing your estate plan. If it has been several years since you looked at your will, our article on how often you should update your will in New York is a useful next read, and our estate planning practice can help you decide whether a codicil, a restatement, or a broader plan review makes the most sense. If you are starting from scratch, our guide on how to create a will in New York is worth reviewing too.

Frequently Asked Questions

What exactly is a codicil in New York?

A codicil is a separate legal document that amends, adds to, or revokes specific provisions of an existing will without replacing the entire document. Under New York's Estates, Powers and Trusts Law, a codicil is treated as part of the will it modifies, and the will and codicil are read together as one testamentary plan once both are admitted to probate.

Does a codicil need to be signed and witnessed like a will?

Yes. New York does not offer a simplified process for codicils. EPTL 3-2.1 requires that a codicil be signed by the testator at the end of the document, in the presence of two witnesses, with both witnesses signing within thirty days of each other and, ideally, an attestation clause and affidavit of the witnesses. A codicil that skips these formalities can be denied probate entirely.

When should I use a codicil instead of writing a new will?

A codicil generally makes sense for a single, discrete change, such as swapping an executor, adjusting one specific bequest, or updating a guardian designation, when the rest of the will still reflects your wishes. If you are making several changes, restructuring how assets pass, or your family circumstances have changed substantially (marriage, divorce, a new child, a death), a full restated will is usually the safer and cleaner option.

Can I just handwrite changes on my existing will instead of preparing a codicil?

No. Handwriting notes, crossing out language, or attaching an unsigned page to your existing will does not amend it under New York law and can create serious problems in Surrogate's Court, including allegations of tampering or partial revocation. Any change to a validly executed will must be made through a properly executed codicil or a new will, not by marking up the original document.

How many codicils can a will have, and is there a downside to stacking several?

There is no fixed legal limit on the number of codicils, but each additional codicil increases the risk of internal contradictions, ambiguous references, and lost or misplaced pages, all of which can delay probate or invite a will contest. Most estate planning attorneys recommend consolidating multiple prior changes into one restated will once a will has accumulated two or more codicils.