California Form GC-340 is the Letters of Guardianship document a probate court issues to officially prove a person has legal authority to act as a child’s guardian. You do not technically “fill out” GC-340 like a normal application. Instead, you complete the front page, sign the oath on the back, file it with the court clerk, and the judge signs it after appointing you, turning it into your official badge of authority under California Probate Code § 2310.
Filing this form correctly matters because banks, schools, doctors, and government agencies will refuse to talk to you without certified copies of signed Letters. According to the Judicial Council of California Court Statistics Report, California probate courts handle tens of thousands of guardianship cases each year, and incomplete Letters are a leading reason new guardians get turned away from banks and schools in the first 30 days.
Here is what you will learn in this guide:
- 📋 The exact line-by-line method to fill out the official Form GC-340 from the Judicial Council without rejection.
- ⚖️ How Probate Code §§ 2310–2317 shape every box, oath, and signature on the form.
- 💰 Why bond, filing fees, and Letters expiration dates can void your authority overnight.
- 👨👩👧 Real named-person scenarios covering grandparent, non-relative, ICWA, and limited guardianship use cases.
- 🚫 The seven costliest mistakes that send guardians back to court and how to avoid each one.
What California Form GC-340 Actually Is
California Form GC-340 is the Letters of Guardianship, a one-page two-sided court order that proves a guardian has been appointed and is currently authorized to act. The form is published by the Judicial Council of California and is mandatory in every county Superior Court that hears probate guardianship matters. It is the output of the guardianship process, not the input — meaning the court issues it after granting the petition, but the proposed guardian still has to prepare it and sign the oath before the clerk will certify it.
The form serves three legal functions at once. First, it identifies the minor and the appointed guardian by name. Second, it states whether the guardianship is of the person, of the estate, or both, which controls what powers the guardian holds. Third, it captures the guardian’s sworn oath to faithfully perform the duties under Probate Code § 2311, which is what gives the document its legal weight outside the courtroom.
A common misconception is that GC-340 is interchangeable with GC-350 (Letters of Conservatorship). It is not. GC-340 is for minors only. If the protected person is an adult who lacks capacity, the correct form is GC-350, and filing the wrong one will get your case kicked back at intake. Another misconception is that Letters never expire. They can and do expire, especially temporary Letters under Probate Code § 2250, which typically last only 30 to 60 days unless extended.
The consequence of mislabeling or misusing GC-340 is severe. A bank that spots an expired Letters date will freeze the minor’s account immediately. A school may refuse to release records. A hospital may delay non-emergency care. The California Courts Self-Help Guide on guardianship emphasizes that certified Letters are the single most important document a guardian carries.
For example, imagine Maria Gonzalez, a grandmother appointed guardian of her grandson in Fresno County. Without a properly signed and certified GC-340, Maria cannot enroll the child in kindergarten, open a custodial savings account, or consent to a tonsillectomy. The form is her legal key to all three doors.
When You Need Form GC-340
You need GC-340 anytime a California probate court appoints you as guardian of a minor’s person, estate, or both. The form is filed concurrently with the appointment order, usually Form GC-240, at the hearing where the judge grants the petition. You will also need a fresh GC-340 if the court extends, modifies, or reissues your authority — for example, after a successor guardian is named or after a temporary guardianship converts to a general one.
Three common triggers create a need for GC-340. The first is a general guardianship petition under Probate Code § 1510, filed on Form GC-210. The second is a temporary guardianship petition under Probate Code § 2250, filed on Form GC-110. The third is a guardianship of the estate involving inherited assets, life insurance proceeds, or settlement money for a minor, which often pairs GC-340 with a bond order on Form GC-345.
A common misconception is that you can act as guardian as soon as the judge says “granted” on the record. You cannot. Until GC-340 is signed by the clerk, sealed, and certified copies are issued, your authority is technically incomplete. The consequence is that any contract you sign — a school enrollment form, a lease, a medical consent — could be challenged as unauthorized.
For example, James Becker in Sacramento County was appointed guardian of his nephew but tried to enroll the boy in school the same afternoon using only the minute order. The school district required a certified copy of GC-340, which Mr. Becker did not yet have, delaying enrollment by a week. The lesson is to walk straight from the courtroom to the clerk’s window and request at least three certified copies the same day.
Where to Get the Official Form
Always pull GC-340 directly from the Judicial Council forms library to make sure you have the current revision. The form is updated periodically, and county clerks reject outdated revisions on sight. The current revision is dated January 1, 2024, and is enforceable statewide. You can also pick up a paper copy at any Superior Court clerk’s office, including the Los Angeles Superior Court probate division and the San Diego Superior Court probate page.
A common misconception is that any blank PDF labeled “GC-340” found on a third-party site is acceptable. Many third-party copies are years out of date and missing the current oath language required by California Rules of Court, Rule 7.1015. The consequence of using an outdated form is automatic rejection at filing, which can delay your appointment by weeks.
Step-by-Step: How to Fill Out Form GC-340
The form has two pages. The front side is the Letters itself. The back side is the Affirmation (oath). You fill out everything except the clerk’s signature line and the seal area. Use black ink only, per California Rules of Court, Rule 2.103.
Caption Box (Top of Page 1)
The caption is the rectangle at the top of the form. You enter the attorney or self-represented party name, address, telephone, and email in the upper-left box. If you are filing without a lawyer, write In Pro Per on the attorney line. Then enter the Superior Court name, branch address, and case number on the right.
The consequence of an incorrect caption is that the clerk’s docket may not match your case, causing the form to be filed in the wrong matter. A common mistake is leaving the case number blank because you do not have one yet. If this is your first filing, the clerk will stamp the case number on intake, but you should fill it in immediately on every later copy.
For example, Aisha Patel, filing in Alameda County, listed her attorney’s address but forgot the email line. The clerk accepted it, but later electronic notices bounced, causing her to miss a status conference. Always include the email under California Rules of Court, Rule 2.111.
Item 1: Type of Guardianship
Item 1 has three checkboxes. Check 1a for guardianship of the person, 1b for guardianship of the estate, or both 1a and 1b if the court appointed you to both roles. The choice mirrors the order on GC-240.
Each box carries different powers. Person guardianship covers custody, schooling, medical care, and residence under Probate Code § 2351. Estate guardianship covers money, property, and contracts under Probate Code § 2400.
A common mistake is checking only 1a when the minor receives money, then trying to use the Letters to open a bank account. The bank will refuse because the Letters show no estate authority. The consequence is a return trip to court to amend the order and reissue Letters.
Item 2: Name of Minor
Item 2 asks for the minor’s full legal name exactly as it appears on the birth certificate. Avoid nicknames. If the minor’s name has changed by court order, list the current legal name and attach the order.
The consequence of a mismatched name is identity-verification failure at banks, the Social Security Administration, and the DMV. For example, Daniel Cho listed his ward as “Danny” instead of “Daniel Jr.,” and the bank rejected the Letters until amended.
Item 3: Powers (Optional Independent Exercise)
Item 3 is where you list any independent powers granted under Probate Code § 2590. These let an estate guardian act without separate court approval — for example, to invest funds, sell property, or operate a business.
Leave Item 3 blank unless the court actually granted independent powers. The consequence of listing powers the court did not grant is that the Letters misrepresent your authority, exposing you to surcharge under Probate Code § 2401.
Item 4: Conditions and Limitations
Item 4 is for limited guardianships, restrictions, or special conditions. This is critical for limited guardianships of developmentally disabled adults’ minor wards and for Indian Child Welfare Act (ICWA) cases where tribal placement preferences apply.
The consequence of skipping Item 4 when conditions exist is that third parties will assume you have full authority you do not actually possess. For example, Sarah Yellowhawk was appointed limited guardian of an ICWA-eligible minor in Humboldt County with a placement-notice condition. Failing to list that condition on Item 4 led to a procedural violation when she moved without notifying the tribe.
Affirmation (Page 2)
Page 2 contains three oath options. Check 4a if you are an individual guardian, 4b if you are a corporate fiduciary, or 4c for a public guardian. Sign and date under penalty of perjury under Probate Code § 2311.
The consequence of an unsigned oath is that the Letters are void on their face. The clerk will not certify them. A common mistake is signing in blue ink or signing before a notary — neither is required, but the signature must be original and in the guardian’s own hand.
The 3 Most Common GC-340 Scenarios
Every guardianship case has a different fact pattern, but three scenarios cover most California filings. Each scenario shows the choice on the form and the legal consequence.
Scenario 1: Grandparent Guardianship After Parental Incarceration
| Form Choice | Legal Effect |
|---|---|
| Check Item 1a only (person) | Grandparent gets custody, schooling, medical authority, but cannot touch minor’s money |
| Leave Item 1b unchecked because no estate exists | No bond required under Probate Code § 2320 |
| Sign oath 4a as individual | Letters issue same day if filed at hearing |
Scenario 2: Non-Relative Guardianship After Parental Death With Life Insurance Proceeds
| Form Choice | Legal Effect |
|---|---|
| Check both 1a and 1b | Full person and estate authority |
| List Item 3 powers only if court granted them | Without § 2590 powers, every sale or investment needs court approval |
| Bond required per Probate Code § 2320 | Letters will not issue until bond posted |
Scenario 3: ICWA Limited Guardianship With Tribal Placement Conditions
| Form Choice | Legal Effect |
|---|---|
| Check 1a; describe ICWA conditions in Item 4 | Tribe must receive notice of major decisions |
| Attach tribal court order if any | Federal preemption under 25 U.S.C. § 1911 |
| Sign oath 4a | Guardian remains accountable to both state and tribal court |
Named-Person Examples
These three named examples illustrate how the form looks in practice. Each one uses real California counties and current Probate Code rules.
Example 1: Maria Gonzalez, Grandmother in Fresno County
Maria Gonzalez petitions for guardianship of her grandson, Luis, age 8, after his parents’ incarceration. She files GC-210, serves notice under Probate Code § 1511, and attends the hearing. The judge grants person-only guardianship.
On GC-340, Maria checks Item 1a, lists Luis’s full legal name in Item 2, leaves Item 3 and Item 4 blank, and signs oath 4a. She requests three certified copies at $40 each from the Fresno Superior Court. She uses one copy for the school, one for the pediatrician, and keeps one in a fireproof safe.
Example 2: James Becker, Uncle in Sacramento County
James Becker becomes guardian of his nephew Tyler, who inherited $180,000 from his late mother’s life insurance. Because estate value exceeds $25,000, Probate Code § 2320 requires a bond.
On GC-340, James checks both 1a and 1b, lists Tyler’s name, leaves Item 3 blank because the court did not grant § 2590 powers, and signs oath 4a. Until he files the bond on GC-345, the Sacramento Superior Court clerk holds the Letters unsigned.
Example 3: Sarah Yellowhawk, Aunt in Humboldt County (ICWA)
Sarah Yellowhawk is appointed limited guardian of her niece Winona, an enrolled member of the Yurok Tribe. The tribal social worker requests notice of major decisions.
On GC-340, Sarah checks 1a, names Winona in Item 2, and writes in Item 4: “ICWA case; tribe to receive notice of changes in residence, school, or medical care.” She signs oath 4a and files at the Humboldt Superior Court. The conditions follow her authority everywhere the Letters go.
Filing, Fees, and Bonds
The general filing fee for a guardianship petition is approximately $435, set by Government Code § 70650. Each certified copy of GC-340 typically costs $40, though counties vary. Fee waivers are available on Form FW-001 for low-income filers.
Bonds are governed by Probate Code § 2320 and are required for estate guardianships unless waived. The bond amount equals the value of personal property plus one year of estimated income. The consequence of skipping the bond is that the clerk will not issue the Letters, and the appointment is functionally on hold.
A common misconception is that fee waivers eliminate the bond. They do not. Bond is a separate financial obligation tied to estate value, not court fees.
How Long Letters Last and When to Renew
General Letters of Guardianship last until the minor turns 18, the guardianship is terminated, or the guardian resigns or is removed under Probate Code § 2650. However, third parties often demand a Letters dated within the last 60 days, even though the legal authority continues. Many guardians order fresh certified copies every 60 to 90 days to avoid friction.
Temporary Letters under § 2250 typically expire in 30 to 60 days. The consequence of acting on expired temporary Letters is that any decision made — bank withdrawal, surgery consent, school transfer — can be challenged.
For example, Daniel Cho in Orange County kept using temporary Letters dated three months earlier to authorize an outpatient procedure. The hospital flagged the date and refused, forcing him back to the Orange County Superior Court for an extension order.
Mistakes to Avoid
Guardianship clerks see the same errors over and over. Each one delays issuance of Letters and can cost weeks of authority.
- Using an outdated form revision. The clerk will reject any GC-340 not on the current Judicial Council revision, costing you a return trip.
- Checking only 1a when estate funds exist. Banks will refuse to open custodial accounts, blocking access to the minor’s inheritance.
- Listing § 2590 powers the court did not grant. This misrepresents authority and exposes you to surcharge under Probate Code § 2401.
- Forgetting to sign the oath on page 2. Unsigned Letters are void on their face, and the clerk cannot certify them.
- Filing without the bond on estate cases. The clerk holds the Letters until bond posts, leaving you in legal limbo.
- Skipping Item 4 in ICWA or limited cases. Conditions imposed by the court do not bind third parties unless they appear on the Letters.
- Requesting only one certified copy. Schools, banks, and doctors each want their own, so order at least three at the hearing.
- Using a nickname in Item 2. Mismatched names trigger identity-verification failures at every agency.
- Assuming the minute order substitutes for Letters. It does not; only certified GC-340 is recognized statewide.
- Letting Letters go stale past 60 days. Even if your authority continues, third parties may refuse to honor old certificates.
Dos and Don’ts
These quick rules separate smooth filings from rejected ones.
- Do pull the form fresh from the Judicial Council site, because outdated revisions are auto-rejected.
- Do list the minor’s full legal name from the birth certificate, because mismatches stop banks cold.
- Do order at least three certified copies at the hearing, because each costs less when ordered together.
- Do check Item 4 carefully for ICWA or limited cases, because conditions outside the Letters are unenforceable against third parties.
- Do keep one certified copy in a fireproof safe, because replacements take days and cost money.
- Don’t check Item 1b unless the court granted estate authority, because the bank will refuse and the surcharge risk is real.
- Don’t sign the oath before reading the duties under Probate Code § 2311, because the oath is enforceable under perjury.
- Don’t use blue ink or pencil, because California Rules of Court, Rule 2.103 requires black ink.
- Don’t rely on temporary Letters past their expiration, because every decision afterward is voidable.
- Don’t skip the bond on estate cases hoping for a waiver, because Probate Code § 2320 sets the floor.
Pros and Cons of Self-Filing GC-340
Many California guardians complete GC-340 without an attorney. Here is the honest tradeoff.
- Pro: Saves $1,500–$5,000 in attorney fees, because the form itself is short and the Self-Help Guide walks you through it.
- Pro: Faster turnaround, because you control the schedule rather than waiting on counsel’s calendar.
- Pro: Builds direct familiarity with the case file, which helps with later annual accountings on Form GC-400.
- Pro: Many counties have free Self-Help Centers that review forms before filing.
- Pro: Probate Code §§ 2310–2317 are written in relatively plain language, making self-filing realistic.
- Con: Missing a bond requirement can stall the case for weeks, because the clerk holds Letters until bond posts.
- Con: ICWA and limited guardianship cases involve federal and state overlap that lay filers often miss.
- Con: Disputed cases with objecting relatives almost always need counsel, because contested hearings have evidentiary rules.
- Con: Surcharge risk under Probate Code § 2401 is real for estate guardians who mishandle the form.
- Con: Mistakes on GC-340 cascade into every later annual accounting, compounding costs over years.
Key Entities You Will Encounter
Several people and agencies appear in every GC-340 case. Knowing each role saves time and confusion.
- The Probate Judge signs the appointment order and Letters, drawing authority from Probate Code § 2200.
- The Court Clerk certifies the Letters, applies the seal, and issues copies under California Rules of Court.
- The Probate Investigator interviews the proposed guardian and minor under Probate Code § 1513.
- The Court Investigator’s Report is filed before the hearing and shapes Item 4 conditions.
- The Bonding Company issues the surety bond required for estate cases under Probate Code § 2320.
- The Tribal Representative appears in ICWA cases under 25 U.S.C. § 1911.
- The Department of Social Services may intervene in cases involving foster placements.
- The Self-Help Center offered through the California Courts Self-Help Guide provides free form review.
Recap of Relevant Court Rulings
California appellate courts have shaped how GC-340 is interpreted. Guardianship of Ann S. (2009) 45 Cal.4th 1110, available through the California Courts opinions database, reaffirmed that probate guardianship and dependency are separate tracks, meaning Letters in one do not transfer to the other. Guardianship of Christian G. (2011) 195 Cal.App.4th 581 confirmed that ICWA notice rules apply to probate guardianships, which is why Item 4 conditions matter.
Guardianship of Vaughan (2012) 207 Cal.App.4th 1055 reinforced that the court’s order, not informal arrangements, controls authority — meaning what is on GC-340 is what counts. The consequence is that any side agreement among relatives is unenforceable unless reflected on the form. The common misconception is that family consensus equals legal authority, which it does not.
After You Get Letters: Immediate Next Steps
Once the clerk hands you certified copies, your job is just beginning. Within 90 days, estate guardians must file an inventory and appraisal on Form DE-160 under Probate Code § 2610. Person guardians must register with the minor’s school district within a reasonable time and update medical providers.
Annual accountings follow on Form GC-400 under Probate Code § 2620. Status reports for person guardianships are filed on Form GC-251. The consequence of missing these is removal under Probate Code § 2650 and personal liability for losses.
For example, Aisha Patel in Alameda County received her Letters but missed the inventory deadline. The court issued an order to show cause, and she had to appear and explain herself, narrowly avoiding removal. The lesson is to calendar every deadline the day you receive Letters.
County-Specific Local Rules
While GC-340 is statewide, local rules tweak filing logistics. The Los Angeles Superior Court probate division requires e-filing for represented parties and specific local forms for confidential investigator reports. The San Diego Superior Court requires guardianship education classes before Letters issue in many cases. The Orange County Superior Court maintains a separate temporary guardianship calendar.
The consequence of ignoring local rules is delayed issuance, even with a perfect GC-340. A common misconception is that statewide forms override local requirements. They do not. Local rules supplement, not replace, the Judicial Council forms.
Frequently Asked Questions
Do California Letters of Guardianship expire?
No. General Letters run until the minor turns 18, the guardianship ends, or the guardian is removed, but third parties often request copies dated within 60 days for verification.
Can I open a bank account with a copy of GC-340?
No. Banks require an original certified copy with the court seal. A photocopy or printout will not be accepted at most California financial institutions.
Is a bond always required on guardianship of the estate?
No. A bond can be waived in limited circumstances such as blocked accounts or court order, but Probate Code § 2320 sets the default requirement based on estate value.
Can I sign GC-340 before the hearing?
Yes. The proposed guardian usually signs the oath before the hearing so the clerk can issue Letters immediately after the judge grants the petition.
Do I need an attorney to fill out GC-340?
No. Many California guardians self-file using the Self-Help Guide, but contested cases or estate guardianships often benefit from counsel.
Can a guardian act on a minute order alone?
No. Only certified GC-340 Letters prove authority to schools, banks, and doctors, even after the judge has orally granted the petition.
Are temporary Letters under § 2250 the same form?
Yes. Temporary appointments use GC-340 with a written expiration date, typically 30 to 60 days, unless the court extends them.
Can two co-guardians both sign GC-340?
Yes. Co-guardians each sign the oath on page 2 and each receive their own certified Letters reflecting joint authority.
Does GC-340 cover ICWA cases?
Yes. ICWA conditions appear in Item 4, and the form remains the operative document, with federal notice rules layered on top.
Will the clerk help me fill out GC-340?
No. Court clerks cannot give legal advice, but Self-Help Centers in most counties review forms for free before filing.
How many certified copies should I order?
Yes, at least three. One for the school, one for medical providers, and one for the bank or safe-keeping covers the typical first month.
Can GC-340 be amended after issuance?
Yes. The court can issue amended Letters after a noticed motion, and the clerk reissues a fresh GC-340 reflecting the changes.
Related reading
- How to Fill Out California Form GC-140 (w/Examples) + FAQs
- How to Fill Out California Form GC-310 (w/Examples) + FAQs
- How to Fill Out California Form GC-330 (w/Examples) + FAQs
- How to Fill Out California Form GC-350 (w/Examples) + FAQs
- How to Fill Out California Form GC-501 (w/Examples) + FAQs
- How to Fill Out California Form GC-405 (w/Examples) + FAQs
- How to Fill Out California Form GC-200 (w/Examples) + FAQs