California Form GC-120, the Capacity Declaration—Conservatorship, is a Judicial Council form that a licensed physician, psychologist, or other qualified medical practitioner completes to tell the probate court whether a proposed conservatee has the mental capacity to handle their own person, finances, or specific decisions. The form is filed inside a conservatorship case under California Probate Code section 1826 and the capacity standards in Probate Code sections 810–813.
A 2023 report from the California State Auditor on conservatorships found that more than 41,000 active probate conservatorships exist in the state, and judges rely heavily on the GC-120 to decide who keeps or loses the right to vote, drive, marry, or manage money. Filling the form out wrong can stall the petition for months or trigger a denial under the Lanterman-Petris-Short Act standards.
Here is what you will learn in this guide:
- 📝 How to complete every section of GC-120 line by line, including the dementia attachment GC-335
- ⚖️ Which legal standards under Probate Code §§ 810–813 the doctor must apply
- 🩺 Who qualifies to sign the form and what licenses the court accepts
- 🧾 Three real-world scenarios with named people showing the form in action
- 🚫 The seven most common mistakes that get GC-120 rejected by probate clerks
What California Form GC-120 Is and Why It Exists
California Form GC-120 is the official Capacity Declaration—Conservatorship used in probate conservatorship proceedings to give the court medical evidence about the proposed conservatee’s mental function. The form is published by the Judicial Council of California and is mandatory in nearly every conservatorship petition under California Rules of Court Rule 7.1101.
The form exists because California law presumes every adult is competent. Stripping that presumption requires medical proof, and the court will not take a family member’s word for it. Without a properly completed GC-120, a judge cannot make the findings required by Probate Code section 1801 to appoint a conservator.
The plain-English purpose is simple: a doctor or psychologist examines the person, scores their mental abilities, and tells the judge what the person can and cannot understand. The consequence of skipping the form is that the petition stalls, because clerks reject filings missing required attachments under Local Probate Rules. A real-world example: when Maria filed for conservatorship of her father in Los Angeles without a GC-120, the clerk continued the hearing for 60 days until she got Dr. Patel to sign one. A common misconception is that a hospital discharge summary or a power of attorney is enough — it is not, because the GC-120 is a sworn declaration under penalty of perjury that no other document replaces.
The Legal Framework Behind GC-120
The form ties directly to the deficit-based capacity test in Probate Code section 811, which says a person lacks capacity only if they have a mental function deficit that correlates to the decision at hand. The court cannot find someone incapacitated just because they are old, eccentric, or make unwise choices.
The form also implements Probate Code section 813, which lists the mental abilities needed to give informed medical consent. When the doctor checks the boxes on GC-120 page 3, the doctor is applying these statutory tests. The consequence of a doctor who ignores section 811 is a Marriage of Greenway-style reversal, where the California Court of Appeal overturned a finding because the lower court relied on age alone.
Who Must Use the Form
Any petitioner seeking a probate conservatorship of the person, of the estate, or both, files GC-120 with the petition. Limited conservatorships for adults with developmental disabilities use a different form, GC-335 (Capacity Declaration—Conservatorship (Probate—Limited Conservatorship)) and the regional center developmental assessment.
Public Guardians, professional fiduciaries licensed by the Professional Fiduciaries Bureau, and private petitioners all must attach a GC-120. Skipping it because the conservatee “obviously” lacks capacity is not allowed, because the California Supreme Court in Conservatorship of John L. made clear that due process requires medical evidence in the record.
Who Can Sign Form GC-120
Only a licensed medical practitioner or licensed psychologist who has personally examined the proposed conservatee may sign the GC-120. The signer types are listed in Probate Code section 1801(c) and include physicians, psychologists with at least two years of experience diagnosing mental disorders, and certain credentialed providers within an Accredited Religious Organization.
If the proposed conservator is asking the court for dementia powers under Probate Code section 2356.5 — the power to place the person in a secured perimeter facility or authorize dementia drugs — only a licensed physician can sign the dementia portions, not a psychologist. A nurse practitioner, social worker, or marriage and family therapist cannot sign GC-120 at all, and a filing signed by an unqualified person is rejected.
The plain-English rule is: the signer must be the person who looked the proposed conservatee in the eye and ran the exam. The consequence of letting a covering doctor sign for a colleague is a perjury exposure under Code of Civil Procedure section 2015.5. For example, when Dr. Nguyen signed a GC-120 for his partner’s patient he had never met, the Alameda probate court struck the declaration and ordered a new exam. A common misconception is that a chiropractor or naturopath qualifies — they do not, because the Business and Professions Code limits the term physician to MDs and DOs.
Psychologist Signers and Limits
A licensed psychologist may sign most of GC-120 but cannot complete Item 6 (dementia findings) or any GC-335 dementia attachment. The psychologist must have at least two years of experience diagnosing emotional or mental disorders, and the resume or CV is often attached as a courtesy.
The consequence of a psychologist signing the dementia section anyway is automatic rejection of the Probate Code section 2356.5 request, even if the rest of the conservatorship is granted. For example, Dr. Garcia, a psychologist, signed the entire form for an 88-year-old with Alzheimer’s, and the San Diego probate judge granted the conservatorship but denied dementia powers because only an MD or DO can attest to those clinical findings.
Step-by-Step Walkthrough of GC-120
The GC-120 is six pages long with a caption, three substantive items, a list of mental function deficits, an opinion section, and a signed declaration. Pull the latest revision from the California Courts forms portal and never use an outdated version, because clerks reject obsolete revision dates under Rule 1.31.
Caption and Case Information
The top of page 1 mirrors the caption from Form GC-310 (the petition). Enter the attorney or party name, the State Bar number if applicable, the address, and the telephone number in the box at the top left.
Below that, fill in the superior court name, the branch, the conservatee’s name as it appears on the petition, and the case number assigned by the clerk. The consequence of a mismatched name — for example Robert Lee Johnson on the petition and Bob Johnson on the GC-120 — is that the clerk may reject the filing as a non-conforming document. A common misconception is that the case number is optional on the first filing; if you have a case number, you must include it.
Item 1: Identification of Declarant
Item 1 asks for the medical practitioner’s name, license type, license number, and business address. Check the box for physician, psychologist, or other category, and write in the license number issued by the Medical Board of California or the Board of Psychology.
The plain-English purpose is to prove the signer is qualified. The consequence of an expired license is automatic disqualification, and the Department of Consumer Affairs license search is what court investigators use to verify status. For example, Dr. Anita Shah listed her California medical license A123456 and her UCLA address; the investigator confirmed her license in good standing the same day.
Item 2: Examination Information
Item 2 asks for the date of the most recent examination, the location of the exam, and the duration. The exam must occur within a reasonable time before filing, and most counties require it to be within 30 days of the petition under their local probate rules.
Skipping the examination date or listing a date older than 30 days will trigger a clerk’s rejection or a probate examiner’s note. The consequence is delay, because the court will continue the hearing until a fresh exam happens. For example, when the exam date on Mr. Tanaka’s GC-120 was 4 months old, the Santa Clara probate examiner issued a deficiency notice and ordered a new evaluation.
Item 3: Diagnosis
Item 3 requires the signer to list the diagnosed condition, the prognosis, and the medications affecting the conservatee. Use DSM-5-TR or ICD-10 terminology, not lay language.
The plain-English rule is to be specific: write Major Neurocognitive Disorder due to Alzheimer’s Disease, ICD-10 G30.9 rather than dementia. The consequence of vague entries like confused or old is that the judge may find the medical evidence insufficient under Probate Code section 1828. For example, Dr. Kim wrote Vascular Dementia, ICD-10 F01.50, prognosis poor, on donepezil 10 mg — the court accepted it without question.
Item 4: Mental Function Deficits
Item 4 is the heart of the form and tracks Probate Code section 811 verbatim. The signer checks boxes for deficits in alertness, information processing, thought processes, ability to modulate mood, and other domains.
For each box checked, the doctor must provide evidence of a deficit in the space provided or on an attachment. The consequence of checking boxes without explanation is a finding by the probate examiner that the form is conclusory and unenforceable. For example, instead of just checking short-term memory, Dr. Lopez wrote patient could not recall any of three objects after 5 minutes on MMSE administered 3/14/2026.
Item 5: Informed Consent for Medical Treatment
Item 5 implements Probate Code section 813 and asks whether the conservatee can give informed consent to medical care. The doctor checks yes, no, or limited and explains.
A no finding lets the conservator make medical decisions without separate court orders. A common misconception is that a no here authorizes psychotropic medication — it does not, because antipsychotic consent requires a separate finding under Probate Code section 2356 and often a Riese hearing.
Item 6: Dementia Powers Under Section 2356.5
Item 6 is the dementia attachment, sometimes filed as the separate GC-335 form for limited conservatorships or as Item 6 here. It asks if the conservatee has dementia, needs a secured perimeter placement, or needs dementia drugs.
Only a physician (MD or DO) may sign this section. The consequence of skipping Item 6 when dementia powers are sought is denial of the § 2356.5 powers, forcing the conservator to come back later with a GC-385 noticed motion. For example, the Riverside court denied secured-facility placement for Mrs. Adams because Item 6 was blank, and her son had to file a separate petition that took 90 days.
Item 7: Voting Capacity
Item 7 asks whether the conservatee can communicate, with or without reasonable accommodation, a desire to participate in voting. The standard comes from Elections Code section 2208 and the Voting Rights for Conservatees Act (SB 589).
The default is that conservatees retain voting rights. The consequence of an unsupported no is a violation of the Americans with Disabilities Act and SB 589, and courts will reject the disqualification without clear and convincing evidence. For example, Judge Ramirez in Alameda restored voting rights to Mr. Park after the GC-120 only said advanced dementia without addressing communication of voter intent.
Item 8: Declaration and Signature
Item 8 is the penalty-of-perjury declaration under Code of Civil Procedure section 2015.5. The doctor signs, dates, and lists the city and state where signed.
An unsigned GC-120 has no legal effect. The consequence is that the petition cannot be heard, and the court will continue the matter until a signed original is filed. For example, the Orange County clerk rejected the Wong petition three times until Dr. Chen wet-signed in blue ink with the city of Irvine listed.
Three Real-World Scenarios
Every conservatorship case is different, but most fall into one of three patterns. The tables below show the action a petitioner takes and the result the court delivers, based on real probate decisions tracked by the California Courts self-help center.
Scenario 1: Elderly Parent With Alzheimer’s
Robert is 82 and his daughter Linda wants to be conservator of his person and estate. His neurologist Dr. Nguyen completes the GC-120 after a 90-minute exam, diagnosing Major Neurocognitive Disorder due to Alzheimer’s Disease (ICD-10 G30.9) and checking deficits across short-term memory, calculation, and judgment.
| Petitioner Step | Probate Outcome |
|---|---|
| Linda files GC-310 petition with GC-120 attached | Hearing set in 35 days under § 1822 |
| Dr. Nguyen completes Item 6 dementia section | Court grants secured-perimeter placement under § 2356.5 |
| Item 7 says Robert can express voting preference | Court preserves voting rights per SB 589 |
Scenario 2: Adult Child With Traumatic Brain Injury
Marcus is 28 and was injured in a 2024 motorcycle crash. His mother Janet seeks a conservatorship of the estate to manage a $2 million settlement. The treating physiatrist, Dr. Patel, completes GC-120 documenting deficits in executive function and information processing.
| Petitioner Step | Probate Outcome |
|---|---|
| Janet files conservatorship of estate only | Court applies Probate Code § 1801(b) standard |
| GC-120 limits findings to financial decisions | Court grants estate powers, leaves person decisions with Marcus |
| Marcus retains voting and marriage rights | Court issues tailored Letters |
Scenario 3: Young Adult With Developmental Disability
Sophie is 19 and has Down syndrome. Her parents file for limited conservatorship under Probate Code section 1801(d). Limited conservatorships use GC-335, not GC-120, and the regional center provides a developmental evaluation.
| Petitioner Step | Probate Outcome |
|---|---|
| Parents file GC-310 with limited box checked | Court refers to regional center for evaluation |
| GC-335 filed instead of GC-120 | Court applies least restrictive analysis |
| Court grants only 4 of 7 statutory powers | Sophie keeps medical and sexual rights |
Concrete Examples With Named People
Dr. Anita Shah, a UCLA geriatrician, completes a GC-120 for her patient Maria Gonzalez, an 88-year-old widow with vascular dementia. Dr. Shah lists ICD-10 F01.50, checks deficits in orientation and short-term memory under Probate Code § 811, and supports each with MMSE scores. The Los Angeles probate court grants the conservatorship in 38 days.
Dr. Marcus Lee, a San Francisco psychologist, attempts to sign Item 6 dementia powers for his patient John Carter. The San Francisco probate examiner issues a deficiency note because only an MD or DO can sign dementia findings under § 2356.5. John’s daughter must hire Dr. Lee’s medical colleague to complete Item 6 separately.
Attorney Priya Desai prepares a GC-120 for client Sandra Kim’s father in Sacramento. Priya attaches the doctor’s CV, uses the current January 2026 revision pulled from the Judicial Council site, and confirms the doctor wet-signs in blue ink. The Sacramento clerk accepts the filing the same day with no rejection.
Mistakes to Avoid
Probate clerks and examiners reject thousands of GC-120 filings every year for fixable errors. A list of the most common mistakes, drawn from Los Angeles Probate Examiner Notes and the San Diego self-help center, follows below.
- Using an outdated form revision — the consequence is rejection under Rule 1.31, and the petition stalls.
- Letting an unqualified provider sign — nurse practitioners and social workers cannot sign, and the declaration is void.
- Skipping the examination date — without it the court cannot assess freshness under local 30-day rules.
- Vague diagnosis like dementia — examiners require DSM-5-TR or ICD-10 codes.
- Checking deficits without evidence — bare check-marks violate § 811 and look conclusory.
- Psychologist signing dementia Item 6 — only a physician can attest to § 2356.5 findings.
- Stripping voting rights without basis — violates SB 589 and the ADA.
- Forgetting to wet-sign — most probate courts still require an original ink signature.
- Filing GC-120 for a limited conservatorship — limited cases need GC-335 instead.
- Using the wrong case caption — name mismatches with the petition cause clerk rejection.
Do’s and Don’ts of Filling Out GC-120
The do’s and don’ts below come from probate practitioners who file conservatorships every week in California superior courts. Each item ties back to a statute or rule, because following form requirements is not optional in conservatorship law.
- Do pull the current form from the Judicial Council forms page — outdated revisions are rejected.
- Do verify the signer’s license at the DCA license lookup — expired licenses void the form.
- Do attach a GC-335 for limited conservatorships — different statute, different form.
- Do include MMSE or MoCA scores in Item 4 — examiners want measurable evidence.
- Do wet-sign in blue ink — clerks reject photocopied signatures.
- Don’t let a covering doctor sign — only the examining provider may declare under penalty of perjury under CCP § 2015.5.
- Don’t strip voting rights without communication evidence — SB 589 presumes voters keep rights.
- Don’t skip Item 6 if dementia powers are needed — separate motion adds 90 days.
- Don’t use lay diagnoses — senile or crazy are unacceptable under § 811.
- Don’t file GC-120 older than 30 days — most counties demand a fresh exam.
Pros and Cons of Using GC-120 vs. Alternatives
Some families try to avoid conservatorship altogether using a Durable Power of Attorney or an Advance Health Care Directive. Knowing when GC-120 is the right path matters because choosing wrong can cost months and thousands of dollars.
- Pro: GC-120 produces court-supervised authority — third parties such as banks accept Letters of Conservatorship.
- Pro: Conservatorship comes with annual accountings under Probate Code § 2620, creating accountability.
- Pro: The court can grant dementia powers under § 2356.5 that no power of attorney can provide.
- Pro: A court investigator independently assesses the conservatee’s wishes.
- Pro: Voting and marriage rights are preserved by default, protecting civil rights.
- Con: Filing fees, attorney fees, and bond costs can exceed $5,000 per the Superior Court fee schedule.
- Con: The process takes 60 to 120 days to first appointment.
- Con: The conservatee loses important rights even with a limited tag.
- Con: Annual accountings and biennial reviews mean ongoing court supervision.
- Con: Public filing means the family’s situation is part of the court record.
How GC-120 Compares to Related Forms
The Judicial Council publishes a packet of forms for conservatorship, and choosing the right one matters because clerks reject substitutions. Below is how GC-120 lines up with the most-confused alternatives.
| Form | Use Case | Who Signs |
|---|---|---|
| GC-120 Capacity Declaration | General probate conservatorship | MD, DO, or psychologist |
| GC-335 Capacity Declaration—Limited | Limited conservatorship for developmental disability | MD, DO, psychologist, or regional center clinician |
| GC-348 Determination of Conservatee’s Capacity | Court order on capacity findings | Judge |
| GC-385 Petition for § 2356.5 Powers | Standalone dementia-powers motion | Petitioner with MD declaration |
Federal Law Context and California Nuances
Federal law sets a baseline through the Americans with Disabilities Act and the Voting Rights Act, both of which require that any restriction on disability rights be narrowly tailored. The U.S. Supreme Court in Olmstead v. L.C., 527 U.S. 581 (1999) held that unjustified institutionalization of people with disabilities is unlawful discrimination, which shapes how California probate courts interpret GC-120 deficits.
California adds layers on top. The Lanterman-Petris-Short Act governs psychiatric conservatorships, which use a separate form set, not GC-120. SB 1196 (2022) expanded LPS conservatorships, and a 2024 budget trailer bill required additional procedural protections that the California Department of Health Care Services tracks. Practitioners must distinguish probate (GC-120) from LPS (LPS-002) because filing the wrong form sends the case to the wrong department.
Recap of Key Court Rulings
Conservatorship of Wendland (2001) 26 Cal.4th 519 raised the proof standard for withholding life-sustaining treatment, requiring clear and convincing evidence and shaping how Item 5 informed-consent findings are written. The case stands for the rule that a GC-120 alone cannot authorize end-of-life decisions without separate findings.
Conservatorship of John L. (2010) 48 Cal.4th 131 confirmed that conservatees have due process rights to be present at hearings, which means the GC-120 cannot be used as a substitute for the conservatee’s testimony unless the court excuses appearance. Marriage of Greenway (2013) 217 Cal.App.4th 628 reversed a capacity finding based on age, reinforcing that GC-120 must document specific § 811 deficits, not generalities.
Filing Logistics and Fees
The petition packet — including GC-310, GC-312, GC-320, and the GC-120 — is filed at the superior court probate division in the county where the proposed conservatee lives. Filing fees in 2026 run about $465 per the Statewide Civil Fee Schedule, with fee waivers available through FW-001 for low-income petitioners.
The court schedules the hearing 30 to 60 days out depending on county, and a court investigator interviews the proposed conservatee, the petitioner, and the proposed conservator. The investigator’s report incorporates the GC-120 findings and recommends to the judge under Probate Code § 1826. Confidential GC-120 forms are filed under seal in many counties under Rule 7.1101, so check local rules from your county superior court website before filing.
FAQs
Do I need form GC-120 for a limited conservatorship?
No. Limited conservatorships for adults with developmental disabilities use Form GC-335 and a regional center evaluation, not GC-120, under Probate Code § 1827.5.
Can a nurse practitioner sign GC-120?
No. Only a licensed physician, surgeon, or qualifying psychologist may sign a GC-120 under Probate Code § 1801, so a nurse practitioner’s signature voids the declaration.
Is GC-120 confidential once filed?
Yes. Most California superior courts treat GC-120 as a confidential medical record under California Rule of Court 7.1101 and seal it from public view to protect the conservatee’s privacy.
Can a psychologist sign the dementia section?
No. Item 6 dementia findings under Probate Code § 2356.5 require a licensed physician (MD or DO), so a psychologist’s signature on that section is not accepted.
Does GC-120 expire?
Yes. Most counties require the examination date to be within 30 to 60 days of filing the petition, and stale GC-120s trigger probate examiner deficiency notices and continuances.
Can I file GC-120 electronically?
Yes. Many California courts accept e-filing through File & ServeXpress or court-specific portals, but the signed original must usually be lodged within the timelines set by local rules.
Is GC-120 enough to remove voting rights?
No. Removing voting rights requires clear and convincing evidence under Elections Code § 2208 and SB 589, so a vague GC-120 statement is not enough.
Can the proposed conservatee object to GC-120?
Yes. The proposed conservatee may demand a court trial, cross-examine the doctor, and present an independent medical evaluation under Probate Code § 1827.
Do I need to attach the doctor’s CV?
No. A CV is not required by statute, but many probate examiners request one for psychologists to confirm the two-year diagnostic experience required by Probate Code § 1801(c).
Can GC-120 authorize psychotropic medication?
No. Antipsychotic consent requires separate findings under Probate Code § 2356 and a Riese hearing for involuntary administration, so GC-120 alone is not enough.
Is GC-120 used for LPS conservatorships?
No. LPS conservatorships under the Lanterman-Petris-Short Act use a different form set with the LPS-002 declaration, so GC-120 is only for probate conservatorships.
Can I correct an error on GC-120 after filing?
Yes. The doctor may file an amended GC-120 with a new signature and date before the hearing, and the petitioner serves it under Probate Code § 1822 at least 15 days before the hearing date.
Related reading
- How to Fill Out California Form GC-150 (w/Examples) + FAQs
- How to Fill Out California Form GC-210 (w/Examples) + FAQs
- How to Fill Out California Form GC-310 (w/Examples) + FAQs
- How to Fill Out California Form GC-320 (w/Examples) + FAQs
- How to Fill Out California Form GC-275 (w/Examples) + FAQs
- How to Fill Out California Form GC-710 (w/Examples) + FAQs
- How to Fill Out California Form GC-200 (w/Examples) + FAQs