Counsel with Managing Partner Steven Farley Bliss helping families from our coastal office, provides a view at drafting ready for testators handling complex validity details discussing: Does A Codicil Have To Follow The Same Execution Rules As A Will In California?

Does A Codicil Have To Follow The Same Execution Rules As A Will In California?

John, a successful tech entrepreneur, drafted his will ten years ago, meticulously outlining his wishes for his estate. Last year, he decided to update the beneficiaries of a small trust fund within his will, creating a codicil. He signed it in his kitchen, with only one friend present as a witness. Unfortunately, John‘s friend was out of state during the signing. When his estate went through probate in San Diego, the codicil was challenged, and the court ultimately invalidated it, leading to a costly and protracted legal battle for his family—costing them $123,849 in legal fees and lost investment opportunities.

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A codicil is a legal document that amends an existing will. While it’s a simpler alternative to rewriting an entire will, it’s crucial to understand that a codicil must adhere to the same strict execution requirements as the original will. In California, this means it must be signed by the testator (the person making the will) in the presence of two simultaneous witnesses, both of whom must also sign the codicil. An experienced wills attorney can help ensure your codicil is legally valid and avoids similar pitfalls. Failing to meet these requirements can render the codicil invalid, potentially leading to the estate being distributed according to the original will, or even under California’s intestacy laws if the original will is also deemed invalid.

The reason for these stringent requirements stems from the potential for fraud and undue influence. A will, and any codicil modifying it, represents a significant transfer of wealth and control. The law demands a high level of certainty that the testator’s wishes are genuine and not the result of coercion or mistake. A comprehensive estate planning strategy should address not only the creation of a will but also the proper execution and potential amendment of testamentary documents to minimize risk and ensure your estate plan reflects your current intentions.

With over 35 years of experience as both an Estate Planning Attorney and a Certified Public Accountant, I’ve seen firsthand how seemingly minor errors in execution can have devastating consequences for families. The CPA advantage is particularly relevant here. Understanding the tax implications of changes made in a codicil—such as the step-up in basis for inherited assets, potential capital gains taxes, and accurate asset valuation—is critical. A CPA-attorney can integrate these considerations into the drafting process, ensuring your codicil not only reflects your wishes but also optimizes your estate’s tax position.

What happens if a codicil isn’t properly witnessed in California?

Counsel with Managing Partner Steven Farley Bliss helping families from our coastal office, provides a view at drafting ready for testators handling complex validity details discussing: Does A Codicil Have To Follow The Same Execution Rules As A Will In California?

If a codicil isn’t properly witnessed according to California Probate Code requirements, it is generally considered invalid. This means the changes outlined in the codicil will not be legally recognized. The estate will be distributed according to the terms of the original will, or if the original will is also invalid, according to California’s intestacy laws. This can lead to unintended consequences and potentially costly legal battles. It’s essential to consult with an attorney in San Diego to review the validity of any codicil and understand your options.

Can I use the same witnesses for my will and my codicil?

Yes, you can use the same witnesses for your will and your codicil, as long as they meet the legal requirements at the time of each signing. However, it’s generally advisable to use different witnesses for each document to avoid any potential challenges to the validity of either one. If a witness has a personal interest in the estate, or if there are questions about their competency, it could create issues during probate.

What is the difference between a codicil and a new will?

A codicil is an amendment to an existing will, while a new will completely replaces the old one. A codicil is suitable for minor changes, such as updating beneficiaries or adding a small bequest. However, if you’re making significant changes to your estate plan, it’s generally better to create a new will. This ensures clarity and avoids any potential conflicts between the original will and the codicil.

What if I want to revoke a codicil I’ve already created?

You can revoke a codicil by creating a new codicil that expressly revokes the previous one, or by creating a new will that is inconsistent with the terms of the old codicil. The revocation must be done with the same formalities as the original codicil—meaning it must be signed by you in the presence of two simultaneous witnesses. It’s important to keep a record of the revocation to avoid any confusion during probate.

How does a codicil affect the step-up in basis for inherited assets?

A codicil can affect the step-up in basis for inherited assets if it changes the beneficiaries of assets. The step-up in basis is a tax benefit that allows beneficiaries to inherit assets at their current fair market value, reducing potential capital gains taxes. If a codicil changes the beneficiaries, it’s important to understand how this will impact the tax implications for each beneficiary. A CPA-attorney can help you navigate these complexities and ensure your codicil is structured to maximize tax benefits.

California Wills: Execution, Capacity, Contests & Revocation Authority (2025–2026)
Execution, Codicils & Validity
Probate Code § 6110

Formal Execution: Two witnesses required; applies equally to codicils.

Probate Code § 6111

Holographic Wills/Codicils: Material provisions must be in the testator’s handwriting.

Probate Code § 6112

Interested Witness Presumption: Gift invalid unless rebutted.

Probate Code § 6113

Choice of Law: Recognition of out-of-state or foreign wills.

Capacity & Undue Influence
Probate Code § 6100.5

Testamentary Capacity: “Sound mind” standard for executing a will or codicil.

WIC § 15610.70

Undue Influence Defined: Four-factor excessive persuasion test.

Probate Code § 21384

Certificate of Independent Review: Required to validate certain donative transfers.

Evidence Code § 500

Burden of Proof: Contestant bears evidentiary burden unless statute shifts it.

Will Contests & No-Contest
Probate Code § 8270

120-Day Deadline: Contest must be filed within statutory window after probate admission.

Probate Code § 21310

Direct Contest Grounds: Forgery, fraud, duress, undue influence, lack of capacity or due execution.

Probate Code § 21311

No-Contest Enforcement: Enforceable only if contest lacks probable cause.

Probate Code § 48

Standing: Defines “interested person” eligible to bring contest.

Revocation, Revival & Lost Wills
Probate Code § 6120

Revocation Methods: Subsequent instrument or physical act.

Probate Code § 6122

Automatic Revocation: Divorce revokes gifts to former spouse.

Probate Code § 6123

Revival: Revoked will not revived unless intent established.

Probate Code § 6124

Presumption of Revocation: Missing will presumed destroyed.

Probate Code § 8223

Lost Will Procedure: Proving contents through testimony and evidence.

Attorney Advertising, Legal Disclosure & Authorship
ATTORNEY ADVERTISING. This content is provided for general informational and educational purposes only and does not constitute legal, financial, or tax advice. Under the California Rules of Professional Conduct and State Bar advertising regulations, this material may be considered attorney advertising. Reading this content does not create an attorney-client relationship or any professional advisory relationship. Laws vary by jurisdiction and are subject to change, including recent 2026 developments under California’s AB 2016 and evolving federal estate and reporting requirements. You should consult a qualified attorney or advisor regarding your specific circumstances before taking action.
Responsible Attorney: Steven F. Bliss, California Attorney (Bar No. 147856).
Local Office:
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San Diego, CA 92123
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San Diego Probate Law is a practice location and trade name used by Steven F. Bliss, Esq., a California-licensed attorney.
About the Author & Legal Review Process
This article was researched and drafted by the Legal Editorial Team of the Law Firm of Steven F. Bliss, Esq., a collective of attorneys, legal writers, and paralegals dedicated to translating complex legal concepts into clear, accurate guidance.
Legal Review: This content was reviewed and approved by Steven F. Bliss, a California-licensed attorney (Bar No. 147856). Mr. Bliss concentrates his practice in estate planning and estate administration, advising clients on proactive planning strategies and representing fiduciaries in probate and trust administration proceedings when formal court involvement becomes necessary.
With more than 35 years of experience in California estate planning and estate administration, Mr. Bliss focuses on structuring enforceable estate plans, guiding fiduciaries through court-supervised proceedings, resolving creditor and notice issues, and coordinating asset management to support compliant, timely distributions and reduce fiduciary risk.

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