Codicils for Wills Created in Another State

Emily just discovered her mother’s Will was drafted in Texas, and she needs to add a beneficiary for a recently born grandchild. She wants to use a simple codicil, but she’s concerned it won’t be valid in California. Sadly, Emily isn’t alone. Many Californians inherit out-of-state Wills, and updating them presents unique challenges, often resulting in unintended disinheritance and costly litigation.

The short answer is yes, a codicil to a Texas Will can be valid in California, but it depends on whether the codicil itself, and the original Will, meet California’s requirements for a valid testamentary document. Specifically, California courts will uphold a Will (and any codicils) if it was validly executed under the laws of the jurisdiction where it was created, and if it doesn’t violate California public policy. This is known as the “sister state” rule.

However, this isn’t a free pass. Texas and California have distinct requirements for witnesses, signature blocks, and even the way changes are made to a Will. If the original Texas Will didn’t meet California standards, the codicil could be deemed invalid, even if it was perfectly acceptable in Texas. For example, Texas requires two witnesses to a Will, whereas California allows for self-proving affidavits that can simplify probate. A codicil drafted without adhering to California’s evidentiary standards creates substantial risk.

Furthermore, a properly executed codicil doesn’t automatically make the entire out-of-state Will California-compliant. It only alters the specific provisions addressed in the codicil. The remainder of the document is still subject to scrutiny under California law. This can lead to complexities, especially if the original Will contains formula clauses related to estate tax exemptions. As of Jan 1, 2026, the OBBBA permanently increased the Federal Estate Tax Exemption to $15 million per person, a change that may render older formula language in Emily’s mother’s Will ineffective or unintentionally disadvantageous.

One often overlooked issue is the inclusion of digital assets. A standard codicil often fails to include the specific RUFADAA language (CPC § 870) required to bypass federal privacy laws, potentially leaving your heirs locked out of crypto-wallets and email accounts. This is a critical component in today’s estate planning landscape, especially given the increasing value of these intangible assets. Without it, accessing these accounts can require a separate court order, adding significant time and expense.

Another concern arises with testamentary trusts and business interests. If the original Will establishes an LLC, it’s crucial to review the operating agreement and ensure it aligns with current California law regarding Beneficial Ownership Information (BOI) reporting. As of March 2025, FinCEN has exempted domestic U.S. LLCs from BOI reporting; however, foreign-registered entities in the U.S. still face mandatory filing requirements and potential penalties. Updating the codicil to reflect the correct entity structure and compliance needs is paramount.

Finally, consider the possibility of an invalidation attempt. Even with a valid codicil, the original Will is still vulnerable to challenge. If a codicil is invalidated, assets may force full probate; however, for deaths on or after April 1, 2025, estates under $208,850 (per CPC § 13100) may still qualify for simplified procedures. This limit is set until 2028. This is particularly relevant for handwritten codicils. While California allows for holographic codicils under Probate Code 6111, but only if the signature and material provisions (who gets what) are in your own handwriting. No witnesses or notary are required for this specific format.

As an estate planning attorney and CPA with over 35 years of experience, I’ve seen firsthand the pitfalls of relying on outdated or improperly executed estate planning documents. The CPA advantage lies in understanding the intricacies of step-up in basis, capital gains tax implications, and the accurate valuation of assets – critical elements that often get overlooked but can significantly impact your beneficiaries’ inheritance. I recommend a thorough review of any out-of-state Will and codicil by a qualified California attorney to ensure its validity and effectiveness.

How do California courts decide whether a will reflects true intent or creates ambiguity?

In California, a last will and testament operates within a probate system that emphasizes intent, clarity, and procedural compliance. When properly drafted, a will does more than distribute property—it creates legally enforceable instructions that guide courts, fiduciaries, and beneficiaries through administration with fewer disputes and less uncertainty.

When a will is drafted with California probate review in mind, it becomes a stabilizing roadmap rather than a source of conflict. Clear intent, proper authority, and compliant execution protect both families and estates.

Primary Legal Authorities Governing Probate and Estate Administration

• Probate & Local Court Rules:
  
  Riverside Superior Court – Probate Division
  
  Official Riverside County probate rules (Title 7), filing procedures, examiner notes, and specific protocols for remote appearances and non-evidentiary hearings.
• Attorney Licensing & Ethical Standards:
  
  State Bar of California
  
  The authoritative source to verify attorney license status, disciplinary history, and current ethical rules governing California attorneys and client trust accounts.
• Judicial Council Forms & Self-Help:
  
  California Courts – Wills, Estates, and Probate
  
  State-issued probate forms and guidance, including small estate procedures, primary residence transfers under AB 2016, and executor responsibilities.
• Federal Estate & Gift Tax Law:
  
  IRS Estate Tax Guidelines
  
  Federal rules governing estate and gift tax filing, including the permanent 2026 OBBBA exemption of $15 million per individual.