Key Takeaways

• Only someone with standing — generally an heir or a beneficiary affected by the will — can contest it.
• The recognized grounds include lack of capacity, undue influence, fraud, duress, improper execution, and revocation.
• Deadlines are strict. A contest after the will is admitted generally must be filed within a set window, and missing it can end the challenge.
• A contest filed too late is treated as lacking probable cause, which matters for no-contest clauses.
• Contesting a will is serious litigation with real risks, including possible disinheritance under a no-contest clause.

Who Can Contest a Will

Not just anyone can challenge a will. A contestant needs standing — a direct financial interest that the will affects. In practice, that usually means:

• An heir who would inherit under California’s intestacy rules if the will were invalid, or
• A beneficiary under the current will or a prior will whose share is reduced or eliminated.

A neighbor, a distant relative with no inheritance interest, or someone simply unhappy with the outcome generally can’t contest. The threshold question is always: does this person stand to gain if the challenge succeeds? If not, they lack standing.

The Grounds for Contesting a Will

A will can’t be challenged just because someone thinks it’s unfair. There has to be a recognized legal ground. The main ones:

• Lack of testamentary capacity. The person didn’t understand what they were doing when they signed — what they owned, who their natural heirs were, or that they were making a will. Covered in depth in our guide on challenging a will on capacity grounds.
• Undue influence. Someone exerted such pressure or control that the will reflects their wishes, not the deceased person’s free will. See undue influence in California estates.
• Fraud. The person was deceived into signing, or about what they were signing.
• Duress or menace. The will was procured by threats or coercion.
• Improper execution. The will wasn’t signed and witnessed the way the law requires (a handwritten “holographic” will has its own rules).
• Revocation. A later will or other act revoked the one being offered.
• Forgery. The will or signature isn’t genuine.

Each ground has its own elements and evidence requirements. The strongest contests are built on documentation and witnesses, not just suspicion — capacity and undue-influence claims in particular turn heavily on medical records, the circumstances of the signing, and the relationships involved.

The Deadlines — and Why They’re Unforgiving

Timing is where many would-be contests die. California sets strict deadlines, and they depend on the posture:

• Before the will is admitted: an interested party can object at or before the hearing on the petition to admit the will.
• After the will is admitted to probate: a contest generally must be filed within a limited window after admission. Miss it, and the contest is typically barred.

These windows are short by design — the law wants estates settled, not reopened indefinitely. The practical lesson: if you’re considering a contest, the time to act is immediately, not after the estate is well underway. Waiting is one of the most common ways a legitimate challenge gets lost.

If you’re thinking about contesting a will, the clock is already running. The deadlines are short and unforgiving. Bay Legal can assess your options quickly. Call (650) 668-8000 or reach us here.For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

The Probable-Cause Trap for Late Contests

There’s a specific reason deadlines matter beyond just losing the right to contest. California courts have held that a will contest filed after the deadline automatically lacks probable cause. That has a sharp consequence when the will contains a no-contest clause (more below): bringing a late, barred contest can itself trigger the clause and cost the contestant their inheritance, because the safe harbor for contests brought with probable cause doesn’t protect an untimely one.

In other words, missing the deadline isn’t just fatal to the contest — it can be affirmatively dangerous. This is one of several reasons not to go it alone on a will challenge.

No-Contest Clauses: The Risk of Losing

Many wills include a no-contest clause — language designed to disinherit anyone who challenges the will and loses. California limits when these clauses can actually be enforced (they generally apply to a “direct contest” brought without probable cause), but they’re far from toothless. A beneficiary who brings a weak or untimely contest can end up with nothing, having forfeited what they would otherwise have inherited.

This changes the calculus entirely. Before contesting, a beneficiary has to weigh not just the odds of winning, but what they stand to lose if they don’t. Our guide on no-contest clauses explains how they work and when they bite.

A no-contest clause can turn a failed challenge into total disinheritance. Before you risk it, get a clear read on your odds and exposure. For guidance on your specific situation, call (650) 668-8000 or schedule a consultation at baylegal.com/contact.

What a Contest Actually Involves

A will contest is full litigation: filing the contest, conducting discovery (gathering medical records, deposing witnesses, examining the drafting attorney and the circumstances of signing), and either settling or trying the case. Capacity and undue-influence cases especially can be evidence-intensive and expensive. They can also be emotionally brutal, since they often pit family members against each other and require airing a loved one’s final months in detail.

That weight is exactly why the threshold decision — is this contest worth bringing? — deserves careful, candid analysis before anyone files.

How This Fits With the Rest of Probate

A will contest is one form of contested probate. It often overlaps with capacity challenges, undue influence, and no-contest clauses, and may run alongside claims of financial elder abuse. For the underlying process, see our complete guide to California probate.

Frequently Asked Questions

Who can contest a will in California?

Someone with standing — generally an heir who would inherit without the will, or a beneficiary under the current or a prior will whose share the will affects. A person with no inheritance interest usually can’t contest.

What are the grounds to contest a will in California?

Lack of testamentary capacity, undue influence, fraud, duress, improper execution, revocation, and forgery. Each has specific elements and evidence requirements.

What is the deadline to contest a will in California?

It depends on the posture. A challenge can be raised at or before the hearing to admit the will, and a contest after admission must be filed within a limited statutory window. The deadlines are strict, and missing them generally bars the contest.

Can you be disinherited for contesting a will?

Yes, potentially. If the will has a no-contest clause and the contest is a direct contest brought without probable cause — including a contest filed too late — the challenger can forfeit their inheritance.

Is it worth contesting a will?

It depends on the strength of the evidence, the amount at stake, the cost, and the risk of a no-contest clause. A candid early assessment of those factors is the most important step before filing.