How to Contest a Will in California

Harvey received a frantic call from his daughter. His estranged brother, recently deceased, had left everything – the family cabin, the savings, even a cherished antique clock – to a new girlfriend Harvey barely knew. His daughter suspected undue influence and insisted they fight it. But Harvey, understandably overwhelmed, didn’t know where to begin. Contesting a Will is complex, expensive, and often emotionally draining, but sometimes necessary to protect your rightful inheritance.

The first step is understanding when a contest is viable. California law isn’t simply about whether you disagree with the distribution; it requires a valid legal ground. The most common challenges fall into three categories: improper execution, lack of testamentary capacity, and undue influence.

What Constitutes Improper Execution?

A Will must adhere strictly to California’s formal requirements. This isn’t merely a suggestion; failing to meet these standards can invalidate the entire document. The testator (the person making the Will) must sign it, or someone must sign on their behalf in their presence and under their direction. Critically, it needs to be witnessed by two adults, who must also sign the document simultaneously alongside the testator. While California allowed temporary remote witnessing during the pandemic, the law (CPC § 6110) has reverted to requiring strict simultaneous presence; remote signatures are generally invalid for Wills unless they meet the narrow ‘Electronic Will’ standards of AB 298. A seemingly minor flaw – a witness signing after the testator, for example – can be grounds for contest. Additionally, if a codicil (an amendment to a Will) is improperly executed, it’s as if it never existed, and the prior Will controls.

How Does Lack of Testamentary Capacity Factor In?

Even a perfectly executed Will can be challenged if the testator lacked the mental capacity to understand what they were doing. California law requires that the testator understand the nature of the act (making a Will), the nature and extent of their property, and who their natural heirs are. This doesn’t mean they need to be in perfect health; cognitive decline due to age alone isn’t enough. But conditions like severe dementia, delirium, or the effects of powerful medication can demonstrate a lack of capacity. Proving this often requires medical records, testimony from treating physicians, and potentially, opinions from forensic psychiatrists.

What About Undue Influence?

This is often the most emotionally charged, and difficult to prove, ground for a Will contest. Undue influence occurs when someone exerts such control over the testator that the Will reflects their wishes, not the testator’s. It’s more than just persuasion; it’s coercion that destroys the testator’s free will. Establishing undue influence requires demonstrating a confidential relationship between the influencer and the testator, that the influencer had the opportunity to exert influence, and that the Will’s provisions are unnatural or inconsistent with the testator’s prior intentions. If a beneficiary is a witness to the Will, California Probate Code § 6112 creates a legal presumption of undue influence, unless there are two disinterested witnesses.

What Happens if the Will is Invalidated?

If a Will is successfully contested, the estate will be distributed according to California’s intestacy laws – as if the testator died without a Will. This may not be what the testator intended, and can lead to protracted family disputes. If a Will is invalidated, assets fall under intestacy; however, for deaths on or after April 1, 2025, estates with personal property under $208,850 (per CPC § 13100) may still bypass full probate via affidavit.

Can I Avoid a Costly Court Battle?

Often, a strong letter from an attorney outlining the grounds for contest can encourage the executor or beneficiaries to negotiate a settlement. Mediation is another effective way to resolve disputes outside of court. However, be prepared for the possibility of litigation. Successfully contesting a Will requires gathering evidence, preparing legal documents, and potentially appearing in court.

The Advantage of a CPA-Attorney

After 35+ years of practicing as both an Estate Planning Attorney and a Certified Public Accountant, I’ve seen firsthand the intricate interplay between legal and financial consequences. A CPA understands the tax implications of contesting a Will – the potential loss of a step-up in basis for inherited assets, the impact on capital gains, and the necessity of accurate valuation. These considerations are critical when evaluating the cost-benefit analysis of a legal challenge.

What About Mistakes in the Will?

Sometimes a Will contains errors that don’t completely invalidate it, but still create ambiguity. Probate Code § 6110(c)(2) allows the court to validate a signature-defective Will if there is ‘clear and convincing evidence’ of the testator’s intent; however, this requires a costly court petition and is not a guaranteed safety net. A well-drafted Will, reviewed and updated regularly, is the best protection against these issues. Furthermore, including a self-proving affidavit, per Probate Code § 8220, allows the Will to be admitted to probate without the testimony of the subscribing witnesses, significantly accelerating the court’s approval process. Finally, modern estate plans need to account for digital assets, and effective 2025, California law (CPC § 871) was expanded to grant fiduciaries power over digital accounts; however, you must still grant explicit RUFADAA powers in your Will or Trust to bypass federal privacy blocks.

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.

• Leadership: Define executor responsibilities clearly.
• Protection: Establish guardian nominations for minors.
• Jurisdiction: Confirm residency rules.

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.

Resources for Legal Standards & Probate Procedure

• Riverside Local Rules: Riverside Superior Court – Probate Division
  Access the essential “Local Rules” (Title 7) effective January 1, 2026. This includes mandatory usage of the eSubmit Document Submission Portal, current Probate Examiner notes, and specific requirements for remote appearances via the court’s designated platform.
• Attorney Verification: State Bar of California
  The official regulatory body for California attorneys. Use this to verify a lawyer’s “Certified Specialist” status in Estate Planning or to access 2026 guidelines on the ethical handling of Client Trust Accounts (IOLTA).
• Self-Help & Forms: California Courts – Wills, Estates, and Probate
  The Judicial Council’s official portal. It includes the updated 2026 forms for the $208,850 personal property threshold and the $750,000 “Primary Residence” simplified transfer procedure (AB 2016).
• Federal Estate Tax Exemption: IRS Estate Tax Guidelines
  The authoritative federal resource for estate and gift tax filing. It reflects the permanent exemption of $15 million per individual (effective Jan 1, 2026), replacing the previously scheduled Tax Cuts and Jobs Act (TCJA) sunset.