Codicil to Will: How to Amend an Existing Will, Requirements & Practical Guide
What Is a Codicil to a Will?
A codicil to a will is a formal document used to amend an existing will.
Instead of replacing the entire will, a codicil can change particular provisions while leaving the remaining provisions of the original document in place.
For example, imagine that someone has a valid will that names their brother as executor. Several years later, they decide that their sister should serve instead.
If the applicable law permits it and the change is properly documented, a codicil could be used to modify the executor provision without necessarily rewriting the entire will.
The key idea is simple:
A codicil changes an existing will; it does not normally function as a completely separate replacement will.
Cornell’s Legal Information Institute defines a codicil as a supplement that can amend or revoke a will in whole or in part and explains that it does not replace the underlying will.
That relationship with the original will is what makes a codicil useful—but also what makes careful drafting important.
Legal information notice: This article is for general educational purposes only. Requirements for wills and codicils differ by jurisdiction. It is not legal advice.
How Does a Codicil to a Will Work?
A codicil generally operates alongside the existing will.
Think of the documents as a set:
Original Will + Valid Codicil = Original Will as Legally Modified by the Codicil
Suppose an original will says:
“I leave my vehicle to Alex.”
A later codicil could change that provision so that the vehicle goes to Jordan instead.
The codicil does not necessarily rewrite every other provision of the original will.
The remaining provisions may continue to apply.
This is why a codicil should clearly identify the will being amended and the exact provision being changed.
A vague amendment can create uncertainty about whether the testator intended to change one sentence, an entire section, or something broader.
What Can a Codicil to a Will Change?
The exact scope depends on applicable law and the drafting of the document, but a codicil can potentially modify several types of testamentary provisions.
Change an Executor
A codicil can potentially change the person nominated to administer the estate.
For example, the original will may name one individual as executor, but that person may later:
- Become unable to serve
- Move away
- Decline the appointment
- Die before the testator
- No longer be the testator’s preferred choice
A properly executed amendment may address that change.
Change a Specific Gift
A testator may want to change who receives a particular asset.
For example:
- A vehicle originally left to one beneficiary could be given to another.
- A piece of jewelry could be left to a different family member.
- A cash gift could be increased or reduced.
The amendment should identify the gift clearly.
Add a Gift
A codicil can potentially add a new testamentary gift.
For instance, a person who acquired a valuable personal item after creating the original will might want to provide a specific gift involving that item.
Remove or Revoke a Gift
A testator may also want to cancel a particular gift.
A codicil can potentially revoke a specified provision, provided the amendment is legally effective.
Change Other Specific Provisions
Other limited changes may also be possible.
The critical issue is whether the codicil clearly expresses the intended amendment and satisfies the applicable legal requirements.
What a Codicil Does Not Automatically Change
One of the biggest practical mistakes is assuming that a codicil changes the entire will.
It normally does not.
If a codicil changes only one provision, the other provisions of the original will generally remain relevant.
For example:
Original Will
- House → Child A
- Vehicle → Child B
- Executor → Brother
Codicil
- Vehicle → Child C
The codicil may alter the vehicle provision while leaving the house and executor provisions unchanged.
The exact legal result depends on the wording and applicable law, but this example demonstrates the basic concept.
Codicil to Will vs. New Will
One of the most important decisions is whether to prepare a codicil or create an entirely new will.
A Codicil May Make Sense When:
- Only a small number of provisions need changing
- The existing will is otherwise current
- The original document is clear
- The proposed amendment is straightforward
- The applicable jurisdiction permits the intended amendment
A New Will May Be Better When:
- Many provisions need to change
- The overall estate plan has changed
- The original will is outdated
- Several codicils already exist
- The original language is difficult to interpret
- Family circumstances have changed substantially
- The estate has become significantly more complicated
The practical advantage of a new will is consolidation.
Instead of asking the executor to interpret an original will together with several amendments, a new will can place the current testamentary plan into one document.
That can reduce confusion.
How Do You Add a Codicil to a Will?
If you are asking how do you add a codicil to a will, the process should begin with the law governing the original will.
A practical sequence is:
Step 1: Identify the Existing Will
Determine exactly which will you want to amend.
Record information such as:
- Date of the will
- Testator’s full legal name
- Relevant document version
- Existing codicils, if any
This prevents uncertainty about which document the amendment is intended to modify.
Step 2: Identify the Exact Change
Write down precisely what needs to change.
For example:
- Change executor
- Change a specific gift
- Add beneficiary
- Remove a beneficiary
- Change a particular provision
Avoid starting with vague language such as “I want to change my will.”
The amendment should identify the actual provision being changed.
Step 3: Check the Applicable Formalities
A codicil is not simply an informal note attached to a will.
The execution requirements depend on the applicable jurisdiction.
The American Bar Association explains that a later amendment to a will is called a codicil and should be signed with the same formalities applicable to the will.
Those formalities may involve:
- The testator’s signature
- Witnesses
- Attestation
- Notarization or self-proving procedures
- Other jurisdiction-specific requirements
Step 4: Draft the Amendment Clearly
The codicil should identify the existing will and clearly state the amendment.
The goal is to make the intended change understandable when the codicil is read together with the original will.
Step 5: Execute the Codicil Properly
The testator and required witnesses should follow the applicable signing procedure.
Do not improvise the execution process.
A defective execution can create probate problems later.
Step 6: Store the Codicil With the Will
The original documents should be stored securely and in a location where the person responsible for estate administration can locate them.
A missing codicil can create serious practical questions about which version of the estate plan controls.
Does a Codicil Need the Same Formalities as a Will?
In many jurisdictions, a codicil must satisfy the formalities applicable to wills.
The American Bar Association specifically states that a later amendment to a will is a codicil and must be signed with the same formalities.
However, the exact requirements are jurisdiction-specific.
Possible requirements can include:
- Written document
- Testator’s signature
- Witness signatures
- Proper attestation
- Notarization
- Self-proving affidavit
- Other statutory requirements
Cornell’s discussion of will validity likewise notes that execution requirements depend on the governing jurisdiction.
Therefore, there is no universal “codicil signing rule” that applies everywhere.
Does a Codicil Have to Be Notarized?
Not necessarily.
Whether notarization is required depends on the applicable jurisdiction and the particular procedure being used.
This distinction is important because people sometimes assume:
“If the codicil is notarized, it must be legally valid.”
That is not necessarily true.
Notarization and testamentary validity are separate legal concepts.
A jurisdiction may require witnesses for the underlying testamentary document, while notarization may be used for a self-proving affidavit or another purpose.
The correct procedure should be verified under the law governing the will.
Does a Codicil Need Witnesses?
In many jurisdictions, witnesses are required for a codicil, particularly where the codicil is executed with the same formalities as a will.
The precise requirements can vary.
Questions may include:
- How many witnesses are required?
- Must they be adults?
- Can beneficiaries act as witnesses?
- Must everyone sign in each other’s presence?
- Does the jurisdiction recognize electronic signatures?
- Is a self-proving affidavit available?
The safest approach is to follow the exact statutory requirements applicable to the document.
A codicil should not be treated like an ordinary contract amendment.
Codicil to Will Template: What Should It Contain?
People frequently search for a codicil to will template because they want to understand what the document should look like.
A codicil will commonly identify:
- The testator
- The existing will
- The provision being amended
- The new provision
- Any provision being revoked
- Confirmation concerning unaffected provisions
- The date
- Required signatures
- Required witnesses
- Any required affidavit or notarization
The exact language should depend on the applicable jurisdiction.
A generic online template should therefore not be assumed to be legally sufficient everywhere.
Why Template Language Matters
A template may look professional while still being unsuitable for a particular jurisdiction or estate.
For example, it might:
- Use the wrong execution language
- Refer to witnesses incorrectly
- Fail to identify the original will adequately
- Create ambiguity
- Omit a required provision
- Conflict with another part of the will
Templates can be useful for understanding structure, but legal effectiveness depends on more than appearance.
Will Codicil Form vs. Informal Amendment
A will codicil form is designed to function as a formal testamentary amendment.
An informal note is something entirely different.
Consider these two examples.
Informal Note
“I want my car to go to Sarah instead of John.”
That statement may express a person’s wishes, but it does not automatically satisfy the legal requirements for a codicil.
Formal Codicil
A properly drafted codicil identifies the existing will, states the specific provision being changed, provides the replacement language, and is executed according to applicable law.
The difference is not merely formatting.
It is legal effect.
Codicil to Will Sample: What Does the Structure Look Like?
A codicil to will sample may typically follow a structure similar to this:
Identification
The document identifies the testator and the existing will.
Amendment
It identifies the specific provision being changed.
Replacement
It states the new provision that should apply.
Confirmation
It confirms that the remaining provisions of the original will continue unless specifically changed.
Execution
The testator signs according to applicable legal requirements, along with any required witnesses or other formalities.
This is a structural explanation—not a universal legal form.
The correct wording and execution procedure can differ by jurisdiction.
Why You Should Not Simply Write on the Original Will
A common mistake is physically crossing out words in the original will and writing replacement language in the margins.
That may create significant uncertainty.
The issue is not whether the testator clearly intended to make a change.
The issue is whether the change was legally executed in the manner required by the applicable law.
A formal codicil—or a new will where appropriate—creates a clearer documentary record.
It also makes it easier for an executor and probate court to determine what the testator intended.
Can You Have More Than One Codicil?
Potentially, yes.
But multiple codicils can make an estate plan more difficult to interpret.
Imagine:
- Original will — 2015
- Codicil #1 — 2018
- Codicil #2 — 2020
- Codicil #3 — 2025
An executor may need to read all four documents together.
If one codicil changes a provision that another codicil previously changed, the resulting interpretation can become complicated.
For that reason, repeated amendments may be a signal that a new will would provide a cleaner solution.
What Happens If a Codicil Conflicts With the Will?
A conflict between an original will and a codicil can create interpretation issues.
The intended relationship between the documents should therefore be as clear as possible.
For example, suppose the will says:
“I leave my house to David.”
A codicil later says:
“I leave my property to Sarah.”
What exactly does “my property” mean?
Does it refer to the house?
All real estate?
All personal property?
Only a particular asset?
Poorly drafted amendments can leave questions like these for the estate-administration process.
The American Bar Association specifically warns that ambiguities between a codicil and the prior will can cause problems.
What Happens to a Codicil During Probate?
A codicil may become part of the probate record because it modifies the will being offered for probate.
Probate is the court process through which a testamentary document may be established as a valid will and through which estate administration may be supervised.
The executor may therefore need to locate and present:
- The original will
- All relevant codicils
- Other required estate documents
This makes document preservation extremely important.
A codicil should not be treated as an independent piece of paper that can safely be separated from the estate’s primary testamentary documents.
What If the Original Will Is Lost?
A missing original will can complicate matters further when a codicil exists.
The legal treatment of lost wills varies by jurisdiction.
A probate court may have specific requirements for proving the existence, contents, execution, or legal effect of a missing testamentary document.
This is another reason to keep the original will and codicils together and stored securely.
Can a Codicil Revoke Part of a Will?
Yes, a codicil can potentially revoke provisions of an existing will.
Cornell defines a codicil as a supplement that may amend or revoke a will in whole or in part.
However, revocation language should be specific.
Compare:
“I revoke my previous gift.”
with:
“I revoke Article IV, Paragraph 2 of my will dated [date], which provides for the distribution of [specific property].”
The second approach is generally clearer because it identifies the exact provision involved.
The appropriate drafting language depends on the circumstances and governing law.
Can a Codicil Add a New Beneficiary?
Potentially, yes.
A codicil can be used to modify beneficiary provisions where permitted.
However, beneficiary changes deserve particular care.
The amendment should clearly identify:
- The beneficiary being added
- The property or benefit involved
- The relevant provision
- Any percentage or amount
- Whether the original beneficiary designation is being changed or supplemented
Where beneficiary designations outside the will are involved, the broader estate plan should also be reviewed.
The American Bar Association notes that beneficiary designations should be reviewed when a codicil or new will is prepared because changes can inadvertently create inconsistencies.
Can a Codicil Change the Executor?
Yes, a codicil may be used to modify an executor provision where permitted.
For example:
Original Will:
“John Smith shall serve as executor.”
Codicil:
“John Smith is removed as executor, and Mary Smith shall serve instead.”
The actual legal wording should be drafted carefully.
An alternate executor may also be identified in case the primary nominee cannot serve.
When Should You Use a New Will Instead?
A new will may be more practical when the amendment is not truly “limited.”
Consider creating a new will rather than relying on another codicil when:
- Multiple beneficiaries need to be changed
- The executor and alternate executor both need changing
- The residuary clause needs substantial revision
- The family structure has changed
- Several codicils already exist
- The original will is difficult to understand
- Major assets have been acquired or sold
- The overall estate plan has changed
The question is not simply:
“Can this be done with a codicil?”
It is:
“Which approach will leave the clearest legally effective estate plan?”
Common Codicil Mistakes
1. Treating a Codicil as a Casual Note
A codicil is a testamentary amendment, not merely a personal memo.
2. Failing to Identify the Original Will
The amendment should make clear which will it modifies.
3. Changing Only One Side of a Provision
A change to one sentence can accidentally conflict with another provision.
4. Ignoring Execution Formalities
A codicil should be signed according to applicable legal requirements.
5. Assuming Notarization Solves Everything
A notarized document can still have other legal defects.
6. Creating Too Many Codicils
Multiple amendments can make interpretation harder.
7. Forgetting Beneficiary Designations
Changing the will may not automatically change beneficiary designations on accounts or policies.
8. Failing to Preserve the Original Documents
The executor needs to be able to locate the will and all valid codicils.
9. Using a Generic Form Without Checking Local Requirements
A form created for one jurisdiction may not satisfy another jurisdiction’s requirements.
Practical Codicil Checklist
Before relying on a codicil to will, consider these questions:
- Have you identified the exact will being amended?
- Is the date of the original will clear?
- Have you identified the exact provision being changed?
- Is the replacement language unambiguous?
- Are you revoking a provision or simply modifying it?
- Do the remaining provisions still work together?
- Are there previous codicils?
- Does the codicil satisfy the applicable execution requirements?
- Are the required witnesses present?
- Is notarization or a self-proving procedure relevant?
- Are beneficiary designations consistent with the amendment?
- Should a completely new will be prepared instead?
- Will the executor know where the original documents are stored?
This checklist is educational and should not be treated as a substitute for jurisdiction-specific legal advice.
A Codicil Is About Precision, Not Just Convenience
The biggest advantage of a codicil is convenience.
If only one provision of a well-drafted will needs to change, amending that provision may be simpler than rebuilding the entire document.
But convenience should never come at the expense of clarity.
A codicil should make it easier—not harder—for someone to determine the testator’s final intentions.
That means the amendment needs to work logically with the original will.
It also needs to be executed correctly.
And it needs to be stored with the rest of the testamentary documents.
Frequently Asked Questions About a Codicil to a Will
What is a codicil to a will?
A codicil is a formal document used to amend, add to, or revoke provisions of an existing will. It generally supplements the original will rather than replacing it.
How do you add a codicil to a will?
Generally, the intended change is documented in a separate codicil that identifies the existing will and the provision being amended, then executed according to the applicable testamentary formalities.
Does a codicil replace a will?
Generally, no. A codicil modifies or supplements the existing will.
Does a codicil have to be notarized?
Not necessarily. Requirements vary by jurisdiction. Some situations may involve notarization or a self-proving affidavit, while other requirements may focus on witnesses and execution.
Does a codicil need witnesses?
Often, yes, but the exact requirements depend on the applicable jurisdiction.
Can a codicil change an executor?
A properly executed codicil can potentially change the executor named in an existing will.
Can a codicil change beneficiaries?
Yes, a codicil can potentially modify beneficiary provisions, provided the change complies with applicable law.
Can I write a codicil myself?
Whether you can prepare one yourself depends on your jurisdiction and circumstances. The more complicated the estate or amendment, the greater the risk that an improperly prepared document could create problems later.
How many codicils can a will have?
There is not a universal numerical limit. However, multiple codicils can make an estate plan harder to interpret, particularly if provisions conflict.
When should I make a new will instead of a codicil?
A new will may be preferable when substantial portions of the estate plan need to change, the original will is outdated, or multiple codicils already exist.
Final Takeaway
A codicil to will provides a way to make a formal change to an existing testamentary document without necessarily replacing the entire will.
It can potentially change an executor, modify a specific gift, add or remove a beneficiary, revoke a provision, or make another limited amendment permitted by law.
But a codicil is not simply a note attached to the original will.
It is a formal testamentary document that generally needs to be executed according to the applicable legal requirements. The American Bar Association specifically cautions that codicils should be handled carefully because inconsistencies between a codicil and the original will can create problems.
For a small, clearly defined change, a codicil may be an effective solution.
For a major revision, multiple previous amendments, or a complicated estate, a new will may produce a much clearer result.
The objective should always be the same: leave a clear, legally effective record of the testator’s final intentions.
WillMastery provides educational resources covering wills, testamentary documents, probate, letters of testamentary, and estate administration. When you are changing an actual will, consult a qualified attorney familiar with the law governing your estate if you are uncertain about the appropriate document or execution requirements.
Disclaimer: This article is for general educational purposes only. It does not constitute legal advice and does not create an attorney-client relationship. Legal requirements vary by jurisdiction and can change over time.