Yes, under California law, wills can be challenged in probate court, including in Southern California counties like Los Angeles, Orange, and San Diego. Only someone with a legal stake in the estate (an “interested person,” such as an heir or beneficiary) may bring a contest. Contested wills are one type of probate litigation in California, usually arising from family inheritance disputes or claims of wrongdoing. California’s Probate Code lays out both the process to challenge a will and the legal grounds for doing so.

The bottom line: if you suspect a will isn’t valid, say it was made under duress or by someone lacking capacity, you may petition the probate court to revoke the will’s admission to probate. But you must act quickly (generally within 120 days after the will is admitted) and prove one of the specific legal grounds the law requires.

Below we unpack who can contest a will, when and how to do it, and the seven core grounds for contesting a will under California law.

Who Can Contest a Will in California?

Not everyone can file a will contest; you must be an interested person. California defines an interested person as someone with a direct financial stake in the estate. In practice, the following people typically have standing:

• Named beneficiaries. Anyone who is named in the will (or a prior version) to receive something can object.
• Heirs-at-law. If the will is invalidated, the estate would pass by intestacy (to spouse, children, parents, etc.), so those heirs can contest it.
• Creditors. A person with a valid claim against the decedent’s estate can challenge a will if it affects payment of debts.
• Executor (Personal Representative). Ironically, the executor named in the will also has standing, sometimes to defend the will or even object if needed.
• Financial dependents. Anyone who was dependent on the decedent for support (e.g. a stepchild) may qualify to contest if they stand to lose that support.

If the court finds you lack standing, your challenge is dismissed before it’s ever heard. So the first step is confirming you are an “interested person” under Probate Code rules. (In practice this means a person who would inherit differently if the will were changed or invalidated.)

When and How to File: Contesting Before or After Probate

A will contest begins with a formal objection in the probate court. Technically this can happen before or after the will is admitted to probate:

• Pre-Admission Contest (Before Probate Hearing). In California you can (and often should) object to the will as soon as you get notice of the petition to admit it. This means filing a written objection and appearing at the initial probate hearing. By objecting before the court admits the will, you force the court to treat the proceeding as a contest from the start. There is no fixed deadline in this phase; you just must file your objection before the hearing date (typically 30–45 days after the petition is filed).
• Post-Admission Contest (Revoking Probate). If you missed the hearing or the will was admitted unopposed, you still have a narrow window to challenge it. California law gives interested parties 120 days after the will is admitted to probate to petition the court to revoke probate and contest the will. In other words, once the court signs the order admitting the will, the 120-day clock starts. (If notice of admission was mailed, you have 60 days after that notice instead, whichever is later.)
  There are very limited exceptions that may extend the deadline (for example, if you had no notice or were a minor/incompetent at the time). But as a rule, failing to act in that 120-day window generally means you lose the right to contest. In fact, courts have held that filing even one day late can be fatal (see Meiri v. Shamtoubi, 2022).

In summary, yes, you can contest a will in California, but you must do it properly: by filing an objection/petition (Probate Code §8250) and serving a summons on all interested persons. The court then sets the contest for trial or hearing.

Grounds to Contest a Will in California

Crucially, you cannot contest a will just because you don’t like its terms. California law requires a legal basis to attack the will’s validity. Probate Code §8252(a) sets out the statutory grounds: a contest must allege one of the following defects:

• Lack of Testamentary Capacity. The testator (the person who made the will) did not have the mental ability to understand the nature of making a will, the extent of their assets, or who the beneficiaries were. In practice, this often means the person had serious cognitive impairment (e.g. dementia, delirium) when they signed. California has a low bar; people can be quite ill but still validly make a will if they were lucid at signing.
• Undue Influence. Another person used excessive pressure or manipulation to override the testator’s free will. This could involve isolating the testator, threatening them, or exploiting vulnerabilities. If someone else essentially dictated the will’s contents, that can void it. Note: California even presumes undue influence in certain situations, for example, if a beneficiary drafted the will or was a close caregiver to the testator.
• Fraud or Forgery. The will (or parts of it) were based on lies or outright fabrication. Examples include tricking the testator into signing something else, forging the testator’s signature, or altering the will after signing. A fraudulent scheme to misrepresent the will’s contents can invalidate it.
• Duress. This is similar to undue influence but specifically involves threats or force. If the testator was coerced under threat of harm or confinement to sign the will, that overcomes consent. (Unlike undue influence, duress doesn’t rely on persuasion but on actual coercion.)
• Improper Execution (Lack of Due Execution). California law requires specific formalities for a will to be valid (Probate Code §6110). A will must be in writing, signed by the testator (or someone at their direction), and attested by at least two witnesses who are present together. If these requirements weren’t met, for example, if the signature or witness formalities were flawed, the will is invalid. (Handwritten “holographic” wills have slightly different rules but must be entirely in the testator’s handwriting and signed.)
• Mistake. If the testator made the will under a mistake of fact, and that mistake directly caused them to distribute their estate differently, the will can be attacked. For example, signing a will believing an heir had died (when they hadn’t) could be a ground for contest.
• Revocation by a Later Will or Act. If a newer valid will exists that revokes the old one, or if the testator intentionally destroyed (burned, tore up) the will with the intent to revoke it, the earlier will is invalid. In practice, having a more recent will supersedes the older one.

These grounds align with §8252(a): the contestant bears the burden to prove one of these defects. (Conversely, the proponent of the will must prove it was properly executed.) In plain English, you must show a problem like incapacity, pressure, fraud, or a technical flaw; you can’t just argue “this distribution is unfair.”

Examples of Common Grounds

• A 90-year-old widower signed a will leaving his house to his new caretaker instead of his two children. If the children prove Dad had dementia or that the caretaker isolated him during the will signing, they may contest it (lack of capacity or undue influence).
• A will was signed without any witnesses because the testator couldn’t find people to come over. A disappointed heir can challenge on “improper execution,” since California requires two witnesses (or a holographic will exception).
• A recent will benefits the same person who drafted it. California law presumes fraud or undue influence in that scenario. The challenger would get a “presumption” that the will is invalid, shifting the burden to the proponent to disprove undue influence.
• A person signs a will thinking it’s a power-of-attorney. That’s fraud; the document is void if the signer misunderstood what they were signing.

No-Contest (In Terrorem) Clauses

Many California wills include a no-contest clause: a provision that says if a beneficiary contests the will, they forfeit their inheritance. These clauses are generally enforceable but only if the contest truly lacked probable cause. Importantly, if you have solid evidence of undue influence, fraud, etc., you likely have “probable cause," and the clause won’t punish you. (However, filing a contest after the deadline creates a separate problem: late contests are deemed without probable cause, nullifying the clause’s protection.) In short, if you’re considering a contest, it’s wise to consult an attorney about any no-contest clause and whether your case is strong enough to avoid its penalty.

Timing, Deadlines, and Process

Timeline: From start to finish, a will contest can be a lengthy process. One probate litigation firm estimates that contested estate cases often take 18–24 months or more to resolve. Early stages include filing paperwork and serving notice (1–3 months), a lengthy discovery phase gathering evidence (6–12 months), and usually mediation/settlement talks around 9–15 months. If the case goes to trial, preparation and trial can push it beyond two years. Many cases do settle earlier; roughly 80–85% of contested will cases settle through negotiation or mediation before reaching a judge.

Starting the Contest: To launch a contest, file an objection to probate with the court (Probate Code §8250). The court will issue a summons to all parties who should have been given notice of the probate petition (usually heirs and devisees) and order them to respond within 30 days. At trial (or hearing), evidence will be presented on both sides. Contested will trials in probate court are bench trials (no jury). Under §8252, the will’s proponent must prove the will was properly executed, and the contestant must prove one of the defects (incapacity, undue influence, etc.).

Deadlines: As noted, you have 120 days after formal probate admission to file a petition revoking the probate (i.e. contesting the will). If the contest is pre-admission, you must file before the hearing date (no strict numeric deadline). There is no leniency for missing the 120-day post-admission window. Even if, say, you only discover evidence of fraud on day 121, the law says you waited too long. The only exceptions are very limited (e.g. you never got notice, or you were a minor/incompetent; see Code §8270(b)).

Costs of Probate Litigation

Contesting a will can be expensive and time-consuming. Because probate litigation often involves extensive evidence gathering (medical records, witness interviews, forensic experts, etc.), legal fees can add up quickly. One summary of California probate suits notes costs can range from a few thousand dollars to well into six figures: roughly $5,000 on the low end for simple disputes up to $150,000+ for complex cases. The factors driving cost include the need for document collection (depositions, subpoenas, experts) and how aggressively the other side litigates.

Time is also a concern. Even a straightforward contest typically takes at least several months, and often a year or two. The estate remains in limbo during that period. Under pressure, many families settle before trial. (Data from one law firm’s experience: about 85% of will contests settle once discovery shows each side’s hand.) But if no agreement is reached, expect a multi-step legal process: pleadings → discovery → mediation → (if needed) trial. Recovery of fees can be tricky; courts generally do not shift attorney fees in will contests unless an opposing party acted in bad faith (a “wasted costs” sanction). Thus, each party usually pays their own way unless the court orders otherwise.

What Happens Next (Settlement or Trial)

Often, contested will cases settle. Settlements might involve redistributing assets, updating the will, or replacing an executor. If a settlement isn’t reached, the case goes to trial. In a trial, each side presents evidence: for example, medical or psychiatric testimony on capacity, handwriting analysis, or testimony about suspicious behavior. Under the law, the court (judge) will decide. If the court invalidates the will, the estate will then pass either under an earlier valid will (if one exists) or by California’s intestacy rules (to spouse, children, etc.).

Even a “partial” win is possible. A court might find that certain provisions of the will were the result of fraud or undue influence and strike those clauses, rather than throw out the entire document. But often the result is all-or-nothing: either admit the will or revoke it.

Southern California Context

In practice, Southern California probate courts (e.g., Los Angeles, Orange, Riverside, and San Diego counties) follow the statewide rules above. There’s no separate law just for SoCal. However, these courts handle a large volume of estate cases, so contested cases there can become quite involved. If you live in Southern California and are involved in a will dispute, you will typically work through your county’s Superior Court (e.g., L.A. County Probate Court) under California Probate Code rules. Some local attorneys specialize in these contests (often called probate litigation or estate litigation attorneys).

Hiring a Probate Litigation Attorney

Because contested wills involve strict procedures and evidence rules, most people hire a probate or estate litigation lawyer. An experienced attorney will ensure all deadlines are met (for filing objections, discovery, etc.), gather the necessary proof (medical records, expert witnesses), and argue your case in court. An attorney can also advise on no-contest clauses, help negotiate settlements, and represent you through trial if needed.

Keep in mind: a qualified lawyer will focus on whether you meet one of the legal grounds above. Without a solid legal basis, filing a contest can backfire (you could even lose your inheritance if it violated a no-contest clause). But with good cause (for example, evidence of actual fraud or abuse), a contest is a legitimate way to protect what the deceased truly intended.

Key Takeaways

• Yes, it can be contested. California law lets “interested persons” challenge a will in probate court.
• Strict grounds required. Legal reasons include lack of capacity, undue influence, fraud, duress, improper execution, mistake, or revocation.
• Tight deadlines. You generally have only 120 days after probate admission to act. Objecting before admission (at the initial hearing) is often even better.
• Complex process. Contests involve formal pleadings, notice, discovery, and often a bench trial. They can last 1–2 years and cost tens of thousands of dollars.
• Settlement is common. Most will contests settle through negotiation or mediation once both sides see the evidence.
• Outcome matters. If you win, the will is invalidated (replaced by an earlier will or intestacy); if you lose, the existing will stands.

Contesting a will sits at the intersection of inheritance disputes, family dynamics, and strict legal procedure. In Southern California (as elsewhere in California), the same state laws apply. If you believe a loved one’s will is invalid, for instance, made under duress or by someone without capacity, it’s crucial to act promptly. Talk to a California probate litigation attorney right away to review the facts. They can tell you if you qualify as an interested person and if you have the evidence to meet one of the legal grounds. Remember: missing the deadline or lacking a valid ground usually ends the case before it starts.

Stay informed, document everything (medical records, witness statements, etc.), and consult qualified counsel. That way you protect your rights in this uniquely challenging area of California probate law.

When the Truth Matters More Than the Document

At its core, contesting a will in California is rarely just about money. It often reflects something deeper, questions about fairness, trust, and whether a loved one’s true wishes were honored.

If something feels off, that instinct deserves attention. Whether it’s concerns about undue influence in California, doubts about lack of capacity in California, or growing tension around inheritance disputes in California, the law gives you a path to seek clarity.

Still, timing matters. Evidence matters. And understanding the grounds to contest a will in California can make the difference between being heard and being shut out.

If you’re thinking about challenging a will in Southern California, take that next step with care, but don’t wait too long. The window to act is limited, and once it closes, it’s hard to reopen.

Protect What Matters; Take the Next Step With Confidence

Real estate is often one of the most valuable parts of an estate and also one of the most emotionally charged. Whether you're dealing with property tied to California probate disputes or unsure how a will contest may affect a home, guidance can make all the difference.

Jack Ma Real Estate understands how deeply personal these situations can be. With experience in property transitions connected to probate cases, their team can help you make informed decisions during uncertain times.

If you're facing questions about estate property, ownership changes, or what happens next:

• Get clarity on your options
• Understand how probate may impact real estate assets
• Take action with the right support behind you

Reach out to Jack Ma Real Estate today and start moving forward with confidence.

FAQs

1. Can a will be contested in California after probate is closed?

In most cases, no. Once the estate is fully administered and closed, it becomes very difficult to reopen a case. This is why acting within the legal timeframe is critical if you’re considering contesting a will in California.

2. What is the most common reason for probate litigation California?

One of the most common reasons is undue influence will California, where someone pressures or manipulates the person who created the will. This often appears in family conflict situations.

3. How do I prove lack of capacity will California?

You typically need medical records, witness testimony, or expert opinions showing the person did not understand what they were signing at the time the will was created.

4. Is hiring a probate lawyer California will contest necessary?

While not required, working with a probate lawyer California will contest cases can significantly improve your chances. They help gather evidence, meet deadlines, and present your case effectively.

5. Are all inheritance disputes California handled in court?

No. Many inheritance disputes California cases are resolved through negotiation or mediation before reaching trial. Settlement is often encouraged to reduce time, cost, and emotional strain.