A client called me last week. Years ago, he had named his daughter as the executor of his will. She had since moved across the country, while his son, a CPA here in Brooklyn, had become his primary caretaker. “Do I need to go through the expense of a whole new will just to swap their names?” he asked. His question involves one of the oldest tools in estate law—the codicil.
A codicil is a legal amendment to an existing will. Instead of revoking the entire document and starting from scratch, it modifies specific parts while reaffirming the rest. For a minor, unambiguous change, this can be an efficient path. But in my practice, I have seen codicils become the source of bitter family disputes and costly probate litigation.
The core issue is that a codicil must be executed with the exact same legal formalities as a will. This is not a sticky note or a handwritten margin comment. In New York, it must comply with Estates, Powers and Trusts Law (EPTL) § 3-2.1, which requires the document to be signed by the testator at the end, in the presence of at least two attesting witnesses who also sign.
Failing to observe these strict formalities is the most common way a codicil fails. If the execution is flawed, the Surrogate’s Court will invalidate the codicil. The terms of the original will—the very terms you sought to change—will stand.
The Hidden Dangers of a “Simple” Codicil
Beyond execution requirements, the greater risk of a codicil is confusion. When you create an amendment, you create a second document that must be read alongside the first. Now your executor and the court have two or more documents to interpret, which can create ambiguity.
Consider a will that leaves the residuary estate “to my children, in equal shares.” A later codicil leaves a $50,000 specific bequest to one child. Is that $50,000 in addition to their equal share of the residue, or is it an advance on that share? The language must be perfectly clear to avoid this conflict. If it is not, you leave your family a legal puzzle, and the cost of solving it will come directly from the estate you intended for them.
Another practical risk is that the codicil gets lost or separated from the original will. If your executor finds the will but not the codicil, they will submit the will to probate in good faith. The intended changes will never take effect. A new will contains language that explicitly revokes all prior wills; a codicil must be kept and presented with the original. It is another moving part in a process that prizes clarity.
When a New Will is the More Prudent Path
So, when does a codicil make sense? I find they are most appropriate for a single, isolated change that is unlikely to be misinterpreted. Examples include:
- Changing an Executor or Trustee: This is perhaps the most common and appropriate use, as in my client’s case. It is a simple substitution of one fiduciary for another.
- Adding or Removing a Small Bequest: A codicil can work well if you want to add a modest cash gift to a friend or remove one for a beneficiary who has passed away.
- Clarifying an Ambiguity: In rare cases, a codicil can clear up confusing language in the original will, though this must be done with extreme care.
If your circumstances have changed significantly, drafting an entirely new will is almost always the better choice. We recommend a new will for major life events. A marriage or divorce dramatically changes your legal and familial landscape. The birth of a new child or grandchild requires rethinking the entire distributive plan, not a patch on the old one.
Furthermore, if you are making substantial changes to who gets what—for example, disinheriting a child or significantly altering beneficiary percentages—a new will is far safer. A codicil that makes a dramatic change can look like a red flag to a court, potentially inviting a will contest on the grounds of undue influence or lack of capacity, especially if the testator was elderly or ill when it was signed.
Stewardship. That is the goal of a well-crafted estate plan. It is about creating a clear, legally resilient plan that transfers your legacy with minimal friction and cost. While a codicil can seem like a shortcut, it sometimes introduces the very friction you are trying to avoid. A new will, by contrast, consolidates your wishes into one clear, authoritative document. It revokes all that came before it, leaving no room for doubt about your final intentions.
If your life has changed since you signed your will, the first step is not to decide between a codicil and a new will. It is to discuss those changes with your estate counsel. We can then review the existing document and determine whether a simple amendment is sufficient or if a complete restatement is the most prudent course to protect your family and your legacy.
