Yes! You can use AI to fill out Judicial Council of California Form DE-120, Notice of Hearing—Decedent's Estate or Trust
Form DE-120 (Notice of Hearing—Decedent's Estate or Trust) is a California probate form used to notify interested persons that a petition, application, report, or account has been filed and that a court hearing has been scheduled. It includes the hearing date/time/location and provides proof sections (e.g., Proof of Service by Mail and a Clerk’s Certificate of Posting) to document that notice was properly given as required by the Probate Code. Proper notice is important because the court may proceed without recipients if they do not appear, and defective notice can delay or jeopardize the requested court orders. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
DE-120 is part of the
California judicial forms, California state forms, estate forms, Judicial Council forms and trust forms categories on Instafill.
Form Complexity Index
Moderate
53 / 100
| Fillable fields | 67 |
| Pages | 2 |
| Fields per page | 34 |
| Sections | 14 |
| Conditional rules | 6 |
| Tables & lists | 1 |
| Instruction pages | — |
| Instafill Form ID | IF-JUDICIAL-COUNCIL-OF-CALIFORNIA-FORM-DE-120-NOTICE-OF-HEARINGDECEDENTS-ESTATE-OR-TRUST |
DE-120 has a moderate Form Complexity Index of 53/100 — 67 fillable fields across 2 pages. Instafill’s AI completes it accurately in under a minute.
Form specifications
| Form name: | Judicial Council of California Form DE-120, Notice of Hearing—Decedent's Estate or Trust |
| Number of fields: | 67 |
| Number of pages: | 2 |
| FCI: | Moderate (53/100) |
| Field instructions: | DE-120 Instructions |
| Filled form examples: | DE-120 Examples |
| Language: | English |
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How to Fill Out DE-120 Online for Free in 2026
Are you looking to fill out a DE-120 form online quickly and accurately? Instafill.ai offers the #1 AI-powered PDF filling software of 2026, allowing you to complete your DE-120 form in just 37 seconds or less.
Follow these steps to fill out your DE-120 form online using Instafill.ai:
- 1 Go to Instafill.ai and upload the DE-120 PDF (or select DE-120 from the form library).
- 2 Enter or import the case details: county, court branch/address (if needed), and the probate case number.
- 3 Provide the party/attorney information (name, firm, address, phone/email, State Bar number, and who the attorney represents).
- 4 Complete the notice caption and matter type by selecting DECEDENT, TRUST, or OTHER and entering the estate/matter name and fiduciary capacity (executor/administrator/trustee, etc.).
- 5 Describe the filing being noticed by entering the complete title and a brief description of the petition/application/report/account, and indicate if it is a Probate Code §12200 status report when applicable.
- 6 Fill in the hearing logistics (date, time, department, room, and any different court name/address) and have Instafill.ai validate required fields and formatting.
- 7 Complete service details: generate the Proof of Service by Mail recipient list (names/addresses), select the mailing method, enter date/place mailed, add signature/printed name and date, then download/print the finalized form for filing and service.
Our AI-powered system ensures each field is filled out correctly, reducing errors and saving you time.
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Frequently Asked Questions About DE-120
DE-120 has a Form Complexity Index of 53 out of 100, placing it in the moderate complexity tier. This score is calculated deterministically from the form’s own structure using Instafill’s published Form Complexity Index methodology, so it can be reproduced and independently verified — it is not a subjective estimate.
For DE-120 specifically, the score reflects 67 fillable fields across 2 pages, grouped into 14 sections, and 6 conditional fields that only apply depending on earlier answers, 1 table or repeating lists. The number of fields is the largest factor in the base score (weighted 36%), followed by how difficult those fields are to complete based on their type, where free-text and signature fields count for more than simple checkboxes (26%). The number of pages that actually contain fields (15%), the amount of conditional “fill-only-if” logic (16%), and how many sections the form is divided into (7%) account for the rest of the base. On top of that base, the index adds points for tables and repeating lists, bundled instruction pages, and dense page layouts — capturing difficulty the base alone can miss.
In practical terms, a moderate score means the form takes real effort: there are enough fields, pages and rules that errors are easy to make by hand. Instafill removes that effort entirely: our AI reads your information, maps each value to the correct field — including the conditional ones — and completes DE-120 accurately in under a minute, with every field available for you to review before you download. See exactly how the Form Complexity Index is calculated.
Form DE-120 is a Notice of Hearing for a decedent’s estate, trust, or certain other probate matters in California. It tells interested persons that a petition, report, or account has been filed and provides the hearing date, time, and location.
Typically, the petitioner (or the petitioner’s attorney) prepares the DE-120 and ensures it is served on all required interested persons. The person who mails the notice must complete and sign the Proof of Service by Mail section.
No—this notice states you are not required to appear. However, you may attend and object or respond if you wish; if you do nothing, the court may act without your input.
Use DE-120 for hearings in a decedent’s estate or trust matter (or other specified probate matters). Do not use it for a petition to administer an estate (use DE-121), guardianship/conservatorship hearings (use GC-020), or a Probate Code § 851 property claim petition (use DE-115/GC-015).
You must provide the attorney or self-represented party’s name, address, phone, and (if applicable) State Bar number, plus the name of the person/entity represented. This identifies who is giving notice and how they can be contacted.
Check the box that matches your matter (DECEDENT, TRUST, or OTHER) and use the correct caption line (e.g., “ESTATE OF (name)” for a decedent’s estate). Enter the case name exactly as it appears on existing court filings and include the case number.
List the complete title of what was filed and add a brief description (for example, “Petition for approval of first account and report of trustee”). This helps recipients understand what the hearing is about.
You must enter the hearing date, time, room, and department (and the court name/address if different from the court listed above). Use the information exactly as scheduled by the court.
If the filing is a “report of the status of a decedent’s estate administration” under Probate Code § 12200, you check that box. The form also warns recipients they may have the right to petition for an accounting under Probate Code § 10950.
Often yes—there is a checkbox in the Proof of Service section stating you served a copy of the petition or other document referred to in item 1. Follow your court’s rules and the notice requirements for your specific filing to confirm what must be included.
The server must be over 18 and not a party, list their address, choose the mailing method (USPS deposit or business collection practice), and provide the date and place mailed. Then they sign under penalty of perjury and list each recipient’s name and address (use an attachment if needed).
Check “Continued on an attachment” and attach additional pages listing all names and addresses. The form suggests using DE-120(MA)/GC-020(MA) as the attachment for the mailing list.
The Clerk’s Certificate of Posting is generally completed by the court clerk (or deputy) when posting is required. Parties usually do not fill out that section unless the court specifically instructs them to do so.
Yes—AI form-filling tools can help reduce errors by extracting case details and placing them into the correct fields. Services like Instafill.ai use AI to auto-fill form fields accurately and save time, but you should still review everything for correctness before filing or serving.
Upload the DE-120 PDF to Instafill.ai, then provide (or import) your case details such as the case number, hearing date/time, court location, and service list. Instafill.ai can auto-populate the fields and let you review, edit, and export a completed PDF for printing/filing.
If the PDF is not fillable, you can still complete it using a tool that converts flat PDFs into fillable forms. Instafill.ai can convert non-fillable PDFs into interactive fillable forms so you can type directly into the fields and generate a clean final copy.
Compliance DE-120
Validation Checks by Instafill.ai
1
Validates required case caption selection and corresponding name field completion
Ensures at least one caption style is selected (e.g., “ESTATE OF (name)” or “IN THE MATTER OF (name)”) and that the corresponding name field is populated. This is critical because the court and recipients rely on the caption to identify the matter correctly. If no caption is selected or the name is missing, the submission should be rejected and the user prompted to select the correct caption and enter the matching name.
2
Enforces mutual exclusivity and completeness for case type (DECEDENT/TRUST/OTHER)
Checks that exactly one case type is selected among DECEDENT, TRUST, or OTHER, and if OTHER is selected, the specific type is provided in the designated text field. This prevents ambiguous or conflicting case classification that can misroute the filing or invalidate notice. If multiple types are selected or OTHER lacks a description, validation fails and the user must correct the selection.
3
Validates case number format and presence across all sections
Verifies that the Case Number is present and matches an expected court case-number pattern (e.g., alphanumeric with separators) and is consistent wherever it appears on the form. The case number is the primary identifier for docketing and service tracking. If missing or malformed, the form should not be accepted because it may be filed under the wrong matter or be unsearchable by the court.
4
Validates Superior Court county and court address completeness
Ensures the Superior Court County is provided and that the court’s street address, mailing address, city/ZIP, and branch name are complete enough to identify the correct court location. Accurate court location details are necessary for proper hearing logistics and for recipients to know where the hearing will occur. If any required court location fields are blank or incomplete, the system should flag the submission for correction.
5
Validates hearing date and time format and logical scheduling
Checks that Hearing Date is a valid date and Hearing Time is a valid time (with AM/PM or 24-hour format per system rules), and that the hearing date/time is not in the past relative to the submission date. This prevents notices that are impossible to comply with or that misinform recipients. If invalid or in the past, validation fails and the user must enter a correct scheduled hearing date/time.
6
Validates hearing location fields (Room and Dept.) formatting and presence
Ensures Room and Department/Dept. are provided and follow expected formatting (e.g., numeric room, alphanumeric department like “Dept. 5”). These fields are essential for attendees to locate the correct courtroom and for court calendaring. If missing or containing clearly invalid placeholders, the system should require correction before submission.
7
Conditional validation for alternate court name/address (if different from above)
If the “Name and address of court, if different from above” section is used, validates that it includes a complete court name and a full mailing address (street/PO box, city, state, ZIP). This prevents conflicting court location information between the main court block and the hearing block. If partially filled (e.g., only a city), validation fails and the user must either complete it or leave it blank.
8
Validates petition/application/report title and description completeness and appropriateness
Ensures the “complete title and briefly describe” field is not empty and contains sufficient detail (e.g., minimum character count) to identify what was filed. This is required so recipients understand what the hearing concerns and can decide whether to object or respond. If the description is missing or too vague (e.g., “petition”), the system should prompt for a more specific title/summary.
9
Validates attorney/party identity block completeness (name and address)
Checks that the filer’s Name and Street Address, City, State, and ZIP Code are present and plausibly formatted. This information is needed for correspondence, service issues, and accountability for the notice. If key identity/address fields are missing, the submission should be blocked until completed.
10
Validates State Bar Number format when an attorney is indicated
If the filer is an attorney (or a State Bar Number is provided), validates that the State Bar Number is numeric and within an expected length range for California bar numbers. This helps ensure the attorney is correctly identified and reduces misattribution or clerical errors. If the bar number is present but malformed, the system should reject it and request correction; if the filer is a party without attorney, the field should be allowed to be blank.
11
Validates contact fields: telephone, fax (optional), and email format
Ensures Telephone Number is present and matches a valid phone format (including area code), Fax Number (if provided) matches a valid phone format, and Email Address matches standard email syntax. Reliable contact information is necessary for service-related communication and court coordination. If telephone or email is invalid/missing (per configured requirements), validation fails and the user must correct the entries.
12
Validates 'Attorney for (name)' consistency with filer role
If an attorney name is provided, requires the “Attorney For (name)” field to be completed and not identical to the attorney’s own name unless explicitly allowed (e.g., self-representation). This ensures the represented party is clearly identified for the record and for recipients. If the attorney-for field is missing or inconsistent, the system should prompt the user to clarify representation.
13
Validates Proof of Service by Mail method selection and dependent fields
Ensures exactly one mailing method is selected: either “depositing the sealed envelope” or “placing the envelope for collection and mailing.” It then requires Date Mailed and Place Mailed (city, state) when a method is selected. If neither or both methods are checked, or if dependent fields are missing, validation fails because service details are legally material.
14
Validates service dates for logical order (posting/mailing/declaration vs hearing)
Checks that Posting Date (if used), Date Mailed, and Declaration Date are valid dates and are not after the Hearing Date, and that Declaration Date is on or after Date Mailed. This supports legal compliance and prevents impossible timelines (e.g., declaring service before mailing). If the date sequence is illogical, the system should block submission and request corrected dates.
15
Validates recipients list completeness and address structure
For each recipient row that has any data, requires both Recipient Name and Recipient Address, and validates the address includes street, city, state, and ZIP (or a configured acceptable postal format). Proper recipient identification is essential to prove notice was mailed to the correct parties. If a recipient entry is partial or the address is incomplete, validation fails and the user must complete or remove that recipient row.
16
Validates attachment indicator vs number of recipients provided
If “Continued on an attachment” is checked, requires an attachment reference/indicator in the submission package (or at minimum confirms the checkbox is intentional). If more recipients exist than the form allows and the attachment box is not checked, the system should warn or fail validation depending on policy. This prevents missing service recipients, which can invalidate notice and delay proceedings.
Common Mistakes in Completing DE-120
People often file DE-120 for matters it explicitly excludes (e.g., a petition to administer an estate requiring DE-121, guardianship/conservatorship hearings requiring GC-020, or a Probate Code § 851 property claim requiring DE-115/GC-015). This happens because the case type sounds similar and filers reuse a prior template. The consequence is rejection by the clerk, continuances, or defective notice that can delay the hearing. Avoid this by confirming the petition type and statute before preparing notice; AI-powered tools like Instafill.ai can flag mismatched form selection based on the case type and petition title.
A frequent error is checking the wrong caption boxes (DECEDENT/TRUST/OTHER and ESTATE OF/IN THE MATTER OF) or entering a name that doesn’t match the court’s caption exactly. This usually happens when users copy the decedent’s name into the wrong field or assume “Estate of” applies to trust matters. The result can be confusion on the court record, misrouting, or the court treating the notice as defective. To avoid it, copy the caption exactly from the filed petition and ensure only the correct boxes are checked; Instafill.ai can auto-map caption data and prevent incompatible box combinations.
Item 1 requires the complete title and a brief description of what was filed, but many filers write something generic like “petition” or omit the title entirely. This happens because they assume recipients already know what the hearing is about. The consequence is inadequate notice to interested persons, which can lead to objections, continuances, or the need to re-serve notice. Avoid this by using the exact document title from the filed pleading (e.g., “First Account and Report of Trustee and Petition for Approval”) and a one-sentence summary; Instafill.ai can pull the title from your uploaded petition and format it consistently.
People commonly enter the wrong hearing date/time, omit the department/room, or use a tentative date that later changes. This often occurs when the hearing is rescheduled or when the filer relies on an earlier minute order. The consequence is recipients appearing at the wrong time/place or claiming they were not properly noticed, which can delay the matter. Avoid it by copying the hearing information directly from the court’s notice or online docket and re-checking before mailing; Instafill.ai can validate date/time formats and prompt you to confirm changes.
Filers sometimes mix the court’s street address with a different branch’s mailing address, or leave the “Name and address of court, if different” section blank when it should be completed. This happens in counties with multiple probate locations or when a P.O. Box is used for mail but hearings occur elsewhere. The consequence is confusion for recipients and potential claims of defective notice. Avoid it by using the exact branch handling the hearing and only completing the “if different” section when it truly differs; Instafill.ai can standardize court addresses and reduce branch-mismatch errors.
Common mistakes include leaving the State Bar number blank, entering an outdated number, listing the wrong “Attorney for” party, or providing an email/phone that doesn’t match the attorney’s current contact information. This happens when staff reuse old firm templates or when a self-represented party fills attorney fields incorrectly. The consequence can be service/communication problems and court questions about representation. Avoid it by verifying the State Bar number and ensuring the “Attorney for” matches the petitioner/representative named in the filing; Instafill.ai can auto-format contact fields and validate common patterns (e.g., bar number length, email format).
A frequent issue is the petitioner/party signing the Proof of Service despite the requirement that the server be over 18 and not a party, or leaving the server’s address blank. This happens because filers don’t realize service must be performed by a non-party and treat it as a simple mailing receipt. The consequence is invalid service, which can force re-service and continuances. Avoid it by using a qualified non-party server, completing the server’s residence/business address, and ensuring the correct signature and printed name are included; Instafill.ai can prompt eligibility checks and ensure required fields are not skipped.
Item 3 requires choosing either USPS deposit or business collection practices, but many people check neither or check both. This happens when users don’t understand the difference or assume it’s optional. The consequence is an incomplete proof of service that may be rejected or challenged. Avoid it by selecting exactly one method that matches how the mail was sent and ensuring postage was prepaid; Instafill.ai can enforce mutually exclusive checkbox logic and prevent submission with neither option selected.
Filers often forget to enter the date mailed, list the wrong city/state, or sign the declaration on a different date than the mailing without explanation. This happens when service is done over multiple days or when the form is prepared before the mailing occurs. The consequence is a questionable proof of service and potential disputes about timeliness of notice. Avoid it by completing the proof only after mailing, using the actual mailing city/state, and ensuring the declaration date matches the signing date; Instafill.ai can flag missing dates and inconsistent timelines.
Item 5 indicates service of a copy of the petition or other document referred to in item 1, but people often forget to include it or forget to check the box confirming it was served. This happens when the filer assumes the notice alone is sufficient or when attachments are separated during mailing. The consequence is incomplete notice, objections from interested persons, and possible re-service orders. Avoid it by assembling each mailing packet with the notice plus the referenced filing and confirming the checkbox accurately; Instafill.ai can generate a service checklist and remind you to include required enclosures.
A common mistake is leaving off required interested persons, using outdated addresses, or squeezing multiple recipients into one line without using the continuation attachment. This happens because address lists are pulled from old correspondence or the filer underestimates who must receive notice. The consequence is defective service that can invalidate the hearing notice and delay court action. Avoid it by cross-checking the service list against the petition, court rules, and the latest address records, and use the DE-120(MA)/GC-020(MA) attachment when the list exceeds the form; Instafill.ai can help maintain a validated recipient database and format addresses to USPS standards.
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