A codicil to a will is a separate legal document that changes specific parts of a will you already have, without replacing the entire document. The original will and the codicil are read together during probate as one set of instructions. Codicils work well for small, targeted updates like swapping an executor or adding a bequest, and poorly for major rewrites or attempts to work around protections the law gives to spouses and after-born children.
What a Codicil Can Change
Codicils are built for limited, specific edits. The most common uses:
- Replacing an executor after your original choice has died, moved, or fallen out of favor.
- Adding a new bequest or removing one that no longer makes sense.
- Correcting a beneficiary’s name or address after a marriage, divorce, or legal name change.
- Naming a different guardian for minor children.
- Adding a charitable gift or adjusting the amount of an existing one.
One newer use is worth calling out. Under the Revised Uniform Fiduciary Access to Digital Assets Act, adopted in every state and the District of Columbia, online service providers can refuse to release account contents unless the account holder explicitly authorized access. A codicil that says your executor may access all your digital accounts satisfies that requirement. Without such language, providers fall back on their own terms-of-service agreements, which often lock executors out of email, social media, and cloud storage.
What Makes a Codicil Legally Valid
A codicil has to meet the same formalities as the will it amends. There is no relaxed standard because the document is shorter or because it only changes one thing. In most states, that means the codicil must be in writing, signed by you, and signed by at least two witnesses who watched you sign or heard you acknowledge your signature. The witnesses should be disinterested, meaning they inherit nothing under the will or the codicil, and everyone should be together in the same room for the entire signing.
You also need testamentary capacity at the moment you sign. In plain terms: you understand you are changing your will, you have a general sense of what you own, and you know who your closest relatives and intended beneficiaries are. If someone later shows you lacked that understanding, a court can throw out the codicil while leaving the original will intact.
Undue influence is the other frequent basis for a challenge. Courts scrutinize situations where a beneficiary who gains from the change pressured you into signing. A codicil signed in a hospital room with only the new beneficiary present is the kind of setting that invites litigation. Independent witnesses and an unremarkable signing help.
Attach a Self-Proving Affidavit
A self-proving affidavit is a sworn statement, signed by you and your witnesses in front of a notary, confirming that the signing followed the legal requirements. Without one, the probate court may need to locate your witnesses years later and have them testify that the signing was legitimate, which can be difficult or impossible if witnesses have moved or died. With one attached, the court can accept the codicil on its face. Most estate planning attorneys include the affidavit as a matter of course, and it adds only a few minutes to the process.
What a Codicil Cannot Override
A codicil can change what your will says, but it cannot rewrite protections the law places outside the will. Drafting an amendment that a court will simply ignore is the biggest avoidable mistake in this area.
Your Spouse’s Elective Share
Nearly every state gives a surviving spouse the right to claim a minimum share of the estate regardless of what the will provides. This elective share typically ranges from one-third to one-half. A codicil that leaves everything to your children and nothing to your spouse will be overridden when the spouse files an election with the probate court, unless the spouse signed a valid prenuptial or postnuptial agreement waiving that right.
Children Born After the Original Will
Most states have pretermitted heir statutes that protect children born or adopted after a will was signed. If your will predates a child’s birth and no later document mentions that child, the child may be entitled to a share as though no will existed. The point of these statutes is to distinguish an intentional omission from an oversight. If you actually want to leave a child out, the codicil needs to say so in plain terms.
There is a trap embedded in this rule. Executing a codicil triggers the republication doctrine in most states, which treats the original will as if it were re-signed on the date of the codicil. A child born between the original will and the codicil now has a stronger argument that you had a chance to address them and did not. If you are signing a codicil for any reason and a child is unmentioned in the will, deal with that child’s status in the codicil itself.
When a New Will Is the Better Choice
Both a codicil and a new will require the same writing, signatures, and witnesses. There is no procedural shortcut. The only genuine advantage of a codicil is that it is a shorter document to draft when the changes are small.
That advantage disappears when the changes are substantial. If you are reshuffling how the bulk of your estate is divided, adding a trust, cutting out someone who was previously a primary beneficiary, or making changes that touch more than two or three provisions, a new will is cleaner and safer. A codicil that tries to do too much forces the probate court to read two documents together and reconcile inconsistencies. Where a codicil directly contradicts the original will, the codicil controls on that point, but ambiguous overlaps invite fights.
Multiple codicils compound the problem. Nothing limits how many you can attach, but experienced estate planners rarely recommend more than one or two. Each additional codicil adds another layer for the court to parse, and the risk of contradictions grows with every one. If you already have a codicil and need another round of changes, a fresh will that folds everything into a single self-contained document is usually the smarter move.
Drafting the Document
Start by reading your current will and noting the exact provisions you want to change. You need the date the original will was signed, because the codicil must reference it specifically. A codicil that says “I amend my will” without identifying which will is immediately vulnerable if you have ever signed more than one.
Open with a header along the lines of “Codicil to the Last Will and Testament of [Your Full Legal Name], dated [Date of Original Will].” Then give clear instructions for each change. If you are replacing a provision, state which article or section you are revoking and provide the replacement language. If you are adding something new, specify where it fits. Vague instructions like “I want my niece to get something nice” create the exact ambiguity that stalls probate. Identify every new beneficiary or executor by full legal name and current address; misidentifying someone, especially where family members share similar names, can cause a gift to fail entirely. Close with a statement that all other provisions of the original will remain in effect. That sentence does real work by telling the court that anything not specifically changed still stands.
A Lighter Alternative for Personal Items
If the only thing you want to update is who gets specific physical items like furniture, jewelry, or artwork, you may not need a codicil at all. A majority of states recognize a personal property memorandum: a separate written list, signed and dated by you, saying which tangible items go to which people. Your will must contain a clause referencing this list for it to be effective, but once that clause is in place, you can revise the list anytime without witnesses, a notary, or any formal execution.
The limits matter. A personal property memorandum cannot transfer money, bank accounts, stocks, real estate, or other intangible property. It also should not list items already specifically bequeathed in the will, because contradictions between the two create the kind of conflict that slows probate. For tangible items of sentimental rather than substantial financial value, the memorandum avoids the cost and formality of a codicil entirely.
What a Codicil Costs
Attorney fees for drafting a codicil generally fall between $100 and $500, depending on complexity and the attorney’s hourly rate. A brand-new simple will from the same attorney has a median cost of roughly $600 or more. For a clean single change like swapping an executor, the codicil is meaningfully cheaper. For changes extensive enough that the attorney has to review and reconcile the whole estate plan, the savings shrink quickly, and a new will can end up costing about the same once you factor in the time spent making sure nothing contradicts.
Notary fees for the self-proving affidavit are minor, typically $5 to $15 per signature. Some states cap notary fees by statute; about a dozen set no maximum. Filing a codicil with the probate court for safekeeping carries fees that vary significantly by jurisdiction.
Storing and Revoking a Codicil
A codicil nobody can find is the same as no codicil at all. Worse: if the original was known to exist but is missing at your death, many states presume you destroyed it intentionally and treat it as revoked. That presumption can be overcome only by clear evidence, and the burden falls on whoever wants to enforce the missing document. Attach the codicil physically to the original will and store them together, usually in a fireproof home safe or a bank safe deposit box. Tell your executor where the documents are and how to get to them. A safe deposit box the executor cannot access without a court order defeats the point.
You can revoke a codicil in three ways. Execute a new codicil that explicitly revokes the earlier one. Sign a new will, which replaces everything before it. Or, in most states, physically destroy the codicil with the intent to revoke it: tearing, burning, or shredding all count.
One nuance is worth holding onto. Revoking a codicil does not revoke the original will; it just removes the amendment and restores the will to its pre-codicil state. Revoking the will itself generally revokes all codicils attached to it, because a codicil cannot stand on its own without the underlying will. If you want to cancel the codicil but keep the will, say so in plain terms in the revoking document.