What is a Codicil to a Will

Emily just called, frantic. Her mother passed away last week, and Emily discovered a handwritten note—apparently a codicil to her mother’s will—altering who received the family lake house. The problem? The note wasn’t properly witnessed, and the lawyer says it’s likely invalid. Now, Emily faces a costly legal battle to determine her mother’s true intentions, a battle that could easily exceed $10,000 in legal fees, and potentially disrupt the carefully planned distribution of her mother’s estate. This scenario is all too common, and highlights the critical need to understand the power – and potential pitfalls – of codicils.

A codicil is essentially an amendment to an existing will. Think of it as a “will update” rather than a complete rewrite. It allows you to make relatively minor changes without the expense and effort of drafting an entirely new estate plan. Common changes addressed in a codicil include updating beneficiaries, adding or removing specific bequests, or changing the executor of your estate. However, it’s not a tool for making sweeping revisions. If your circumstances have changed dramatically, a new will is almost always the better approach.

What distinguishes a valid codicil from a mere scrap of paper? Strict adherence to the same formalities required for executing a will. In California, this means the codicil must be:

Signed by the testator (the person making the will), or someone signing on their behalf and under their direction.
Witnessed by at least two people, each of whom understands that they are witnessing a codicil to a will. These witnesses must be present at the same time and observe the testator signing.
In writing. Oral amendments are not valid.

A failure to meet any of these requirements can invalidate the codicil, meaning your estate will be distributed according to the original will—potentially frustrating your current wishes. 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.

What happens if I try to handwrite a Codicil?

Many people believe they can simply jot down changes on their existing will. While California law does recognize holographic wills and codicils – those written entirely in your own handwriting – the requirements are stringent. Under Probate Code 6111, handwritten codicils are valid in California, 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. However, a poorly worded or ambiguous holographic codicil can still be challenged in court. The handwriting must be clearly legible and demonstrate a clear intent to amend the original will. Furthermore, relying solely on a holographic codicil significantly increases the risk of probate disputes.

How do Codicils affect tax planning with older Wills?

When incorporating a codicil into an older estate plan, it’s crucial to review potential tax implications. Often, wills drafted years ago contain outdated provisions regarding estate tax exemptions. The 2026 ‘tax cliff’ was averted by the OBBBA, which permanently increased the Federal Estate Tax Exemption to $15 million per person effective Jan 1, 2026. Old formula clauses should be reviewed to ensure they don’t over-fund trusts under these new limits. As a CPA as well as an attorney, I see this mistake frequently; proper tax planning requires careful consideration of current laws and potential future changes. Failing to do so can result in unnecessary taxes and a reduced inheritance for your beneficiaries.

What about changes to my business entities and a Codicil?

If your estate plan includes assets held within a Limited Liability Company (LLC) or other business entity, any codicil must reflect current ownership and control structures. The beneficial ownership information (BOI) reporting requirements have shifted significantly. 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. Ensure your codicil accurately reflects any changes in entity ownership to avoid potential legal issues and ensure a smooth transfer of assets.

What about Digital Assets and a Codicil?

In today’s digital age, many estates include significant digital assets – online accounts, cryptocurrency, and other virtual property. 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. Without proper authorization, accessing these assets can become a legal nightmare. Your codicil needs to specifically address how these digital assets should be managed and distributed, including the authority to access necessary accounts and passwords.

For over 35 years, I’ve helped families in Temecula navigate these complex estate planning issues. My dual background as an Estate Planning Attorney and a Certified Public Accountant allows me to offer a uniquely comprehensive approach, ensuring not only that your wishes are legally documented but also that your estate is administered in the most tax-efficient manner possible. The step-up in basis afforded to inherited assets is a significant tax benefit, and requires careful planning. Valuation of business interests or real property may also require a CPA’s expertise.

How do probate courts in California evaluate intent when a will is challenged?

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.

For California residents, understanding how intent, authority, and compliance interact is one of the most effective ways to protect family harmony and estate integrity. A will that anticipates probate scrutiny is far more likely to be honored as written and far less likely to become the source of unnecessary conflict.

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 via the court’s designated platform for 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 (IOLTA).
• Judicial Council Forms & Self-Help:
  
  California Courts – Wills, Estates, and Probate
  
  State-issued probate forms and guidance, including small estate procedures ($208,850 limit), primary residence transfers under AB 2016 ($750,000 limit), and executor responsibilities.
• Federal Estate & Gift Tax Law:
  
  IRS Estate Tax Guidelines
  
  Federal rules governing estate and gift tax filing, including the permanent 2026 exemption of $15 million per individual (indexed for inflation).