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Attachment to Notice of Hearing Proof of Service by Mail (Probate—Decedents' Estates and Guardianships and Conservatorships), page 1
Moderate · 48/100Form Complexity Index

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What this form asks for

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This form, officially titled 'Attachment to Notice of Hearing Proof of Service by Mail,' is a supplemental document for California court proceedings involving decedents' estates, guardianships, and conservatorships. It is used in conjunction with forms DE-120 and GC-020 to provide a comprehensive list of all individuals who were mailed a notice of a court hearing, ensuring a complete record of service. 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.
Fillable fields57
Pages1
Form Complexity IndexModerate, 48/100

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How to Fill Out DE-120(MA)/GC-020(MA) Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select the DE-120(MA)/GC-020(MA) form.
  2. Provide the case number and the name of the estate, guardianship, or conservatorship matter at the top of the form.
  3. Use the AI-assisted fields to enter the full name and address (street, city, state, zip code) for each person who was served notice by mail.
  4. If you have a long list of recipients, the AI can help you efficiently populate the required information for each individual.
  5. Carefully review all the names and addresses entered on the attachment to ensure accuracy and completeness for the court record.
  6. Download the completed form. Print and attach it to the main Proof of Service form (DE-120 or GC-020) before filing with the court.

Common Mistakes in Completing DE-120(MA)/GC-020(MA)

The ones the AI is built to catch.

Incorrect or Missing Case Number
This critical error often happens when filers are in a hurry or managing multiple cases. Submitting the form without the correct case number means the court clerk cannot associate it with the proper legal file, leading to rejection of the document. This can invalidate the proof of service, causing significant delays and potentially requiring the hearing to be re-noticed and rescheduled.
Using Incomplete or Incorrect Addresses
This is one of the most frequent and damaging mistakes, often involving missing apartment or suite numbers, incorrect street names, or wrong zip codes. An incorrect address will likely result in the notice being returned as undeliverable, rendering the service invalid. This failure to provide proper notice can halt the entire legal process until all parties are correctly served again, wasting time and money.
Incomplete or Misspelled Party Names
Filers may use nicknames, abbreviations, or misspell the names of the people being served. Legally, service must be made to the person's correct, full legal name. An incorrect name could give the served party grounds to challenge the validity of the notice, potentially voiding any court orders made at the hearing.
Forgetting to Complete the Header Information
Users sometimes focus on the list of names and addresses and forget to fill out the top section, specifically the 'MATTER OF (Name)' field. This field identifies the decedent, conservatee, or minor the case is about. Leaving it blank makes the attachment ambiguous and may cause the court to reject the filing until it is corrected and resubmitted.
Omitting Legally Required Parties
Probate and guardianship cases have strict rules about who must receive notice of a hearing, such as all heirs, beneficiaries, and close relatives. A filer might mistakenly omit a required person from the service list, which is a serious procedural defect. This failure to notify a party with a legal interest can be grounds for appealing and overturning any orders made by the court at the hearing.
Improper Pagination for Multiple Pages
When serving many people, more than one attachment page is often necessary. A common error is failing to fill in the 'Page ___ of ___' fields correctly across all pages. For example, submitting three pages all marked 'Page 1 of 1' can lead to the court only considering the first page, effectively ignoring the other parties listed.
Submitting the Attachment without the Main Form
The document is clearly labeled as an 'Attachment to Notice of Hearing Proof of Service by Mail' for use with forms DE-120 or GC-020. A significant mistake is filing this attachment by itself, without the primary Proof of Service form it is meant to supplement. The attachment alone is not a complete legal declaration, and filing it solo will result in an incomplete and invalid submission.
Illegible Handwriting
When a form is printed and filled out by hand, poor handwriting can make names, addresses, and the case number unreadable. If the information is illegible, the filing may be rejected, or the mail may not be delivered, invalidating the service. Using a fillable PDF or a tool like Instafill.ai, which can convert flat PDFs into fillable forms, ensures all text is typed and perfectly legible.
Incorrectly Checking the Case Type
The form header provides options for 'GUARDIANSHIP', 'CONSERVATORSHIP', and 'ESTATE'. Filers, especially those new to the legal process, may be confused about the distinctions and check the wrong box or forget to check one at all. This creates ambiguity in the court record and can lead to administrative delays as the clerk may need to seek clarification before the document can be properly filed.
Mixing Up Name and Address Fields
The form uses a table to organize information, but when filling it out quickly, it's possible to enter data in the wrong column. For example, a user might accidentally type the city and state in the 'Name of person served' field. This data entry error makes the entry for that person invalid and confusing, potentially leading to that person's service being deemed improper.

Frequently Asked Questions About DE-120(MA)/GC-020(MA)

 

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How complex is DE-120(MA)/GC-020(MA) to fill out?
DE-120(MA)/GC-020(MA) has a Form Complexity Index of 48 out of 100, in the moderate tier: 57 fillable fields across 1 page. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is the purpose of form DE-120(MA)/GC-020(MA)?
This form is an attachment used with either Form DE-120 or GC-020 to provide a complete list of all individuals who were mailed a notice of a court hearing. You use it when you run out of space on the main Proof of Service form.
Who needs to fill out this attachment?
You need to fill out this form if you are serving a Notice of Hearing by mail in a probate, guardianship, or conservatorship case and need more space to list everyone you served than is available on the primary form.
Do I file this form by itself?
No, this form is an attachment and must be filed with either Form DE-120 (Proof of Service by Mail for Decedents' Estates) or Form GC-020 (Proof of Service by Mail for Guardianships and Conservatorships).
What information is required to complete this form?
You will need the court case number, the name of the estate or person the case is about, and the full name and complete mailing address for each person you sent the Notice of Hearing to.
How do I fill out the 'MATTER OF (Name)' section?
In this section, write the name of the decedent for an estate case, or the name of the minor or proposed conservatee for a guardianship or conservatorship case. Also, be sure to check the appropriate box for the type of case.
What if I have more people to list than will fit on one page?
You can use multiple copies of this attachment form. Simply number the pages accordingly in the 'Page __ of __' section at the bottom right to ensure the court knows how many pages are included.
Where do I submit this form?
This attachment should be submitted to the court clerk's office along with the main Proof of Service form (DE-120 or GC-020) it is attached to. Always keep a copy for your own records.
The form says 'Approved for Optional Use.' What does that mean?
This means that while this specific Judicial Council form is approved for use, you are not strictly required to use it. However, using this standardized form is highly recommended for clarity and consistency when you need extra space.
What should I do if I don't have a complete address for someone on the list?
You must provide the last known, complete mailing address for each person served, as this form is proof of mailing. If an address is unknown, you may need to consult with an attorney or the court's self-help center for guidance on proper service.
Can AI tools help me fill out this form?
Yes, services like Instafill.ai use AI to accurately auto-fill form fields from your saved information, which can save you significant time and reduce errors. This is especially helpful for repetitive information like case numbers and names.
How can I fill out the DE-120(MA)/GC-020(MA) form online?
You can use a service like Instafill.ai to fill out this form online. Simply upload the PDF, and the platform will make it interactive, allowing you to type directly into the fields and save your progress.
The PDF version of this form I found isn't fillable. What can I do?
If you have a non-fillable PDF, you can use a tool like Instafill.ai to convert it into an interactive, fillable form. This allows you to easily type your information instead of having to print and fill it out by hand.
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California state forms: Judicial Council of California Form DE-111, Petition for Probate (Probate—Decedents Estates), DS 1891, Applicant/Vendor Disclosure Statement (State of California Department of Developmental Services), Judicial Council of California Form DE-120, Notice of Hearing—Decedent's Estate or Trust, Judicial Council of California Form DE-120, Notice of Hearing—Decedent's Estate or Trust, Murrieta Police Department Citizen Complaint Form (California Penal Code § 148.6 Advisory Statement), California Department of Social Services, Sworn Statement, State of California Department of Transportation California Civil Rights Laws Certification, State of California Department of Transportation Darfur Contracting Act Certification, Form DOT ADM-0077, State of California Department of Transportation, Contract Requirements, State of California Department of Transportation Subcontractor List, State of California Department of Transportation, Certified DVBE Summary, Bidder Declaration GSPD-05-105, State of California Level of Care Rate Determination Protocol Matrix, State of California Accessible Form, State of California Form SOC 321, Request for Order and Consent - Paramedical Services, State of California Darfur Contracting Act Certification, State of California Department of Veterans Affairs COMMERCIALLY USEFUL FUNCTION (CUF) CERTIFICATION FORM, Form ADR-100, Statement of Agreement or Nonagreement, Civil Appeal Case Information Statement, Form APP-014, Appellant's Proposed Statement on Appeal (Unlimited Civil Case)

California court forms: Judicial Council of California Form SC-105, Request for Court Order and Answer (Small Claims), Judicial Council of California Form SC-120, Defendant’s Claim and ORDER to Go to Small Claims Court (Small Claims), Judicial Council of California Form SER-001, Request for Sheriff to Serve Court Papers, Judicial Council of California Form SER-001, Request for Sheriff to Serve Court Papers, Affidavit for Collection of Personal Property California Probate Code Section 13100, Form POS-040, Proof of Service—Civil, Declaration of Facts of Death (California Superior Court), declaration-of-marriage-for-court-proceeding-california-family-law, ADOPT-200, Adoption Request, ADOPT-200, Stepparent Adoption Request, ADOPT-210, Adoption Agreement, ADOPT-310, Contact After Adoption Agreement, Judicial Council of California Form ADOPT-200, Adoption Request, Form ADR-107, Mediation Attendance Sheet, Form ADR-110, Order Appointing Referee, Form ADR-109, Stipulation or Motion for Order Appointing Referee, Form ADR-102, Request for Trial De Novo After Judicial Arbitration, Form ADR-108, Referee's Report (Code Civ. Proc., §§ 638, 639), Form ADR-106, Petition to Confirm, Correct, or Vacate Contractual Arbitration Award, Form ADR-104, Rejection of Award and Request for Trial After Attorney-Client Fee Arbitration

California probate forms: Judicial Council of California Form DE-111, Petition for Probate (Probate—Decedents Estates), Affidavit for Collection of Personal Property California Probate Code Section 13100, Form DE-142/DE-111(A-3e), Waiver of Bond by Heir or Beneficiary (Probate—Decedents Estates), Form DE-140, Order for Probate, Form DE-150, Letters (Probate), Form DE-154/GC-035, Request for Special Notice (Probate), Form DE-157, Notice of Administration to Creditors, Form DE-120(P), Proof of Personal Service of Notice of Hearing—Decedent's Estate or Trust, Form DE-131, Proof of Subscribing Witness (Probate), Form DE-172, Creditor's Claim (Probate), Form DE-174, Allowance or Rejection of Creditor's Claim, Form DE-221, Spousal or Domestic Partner Property Petition (Probate—Decedents Estates), Form DE-270 / GC-070, Ex Parte Petition for Authority to Sell Securities and Order, Form DE-315, Order Determining Succession to Primary Residence, Form DE-351/GC-101, Order Appointing Guardian Ad Litem—Probate, Form DE-115/GC-015, Notice of Hearing on Petition to Determine Claim to Property, Attachment to Notice of Hearing Proof of Personal Service (Probate—Decedents' Estates and Guardianships and Conservatorships), Form DE-125, Summons (Probate), Form DE-147, Duties and Liabilities of Personal Representative, Form DE-147S, Confidential Supplement to Duties and Liabilities of Personal Representative (Probate)

proof of service forms: Form POS-040, Proof of Service—Civil, Judicial Council of California Form SC-104, Proof of Service (Small Claims), Judicial Council of California Form SC-104, Proof of Service (Small Claims), Form DV-200, Proof of Personal Service (CLETS) (Domestic Violence Prevention), Illinois Circuit Court Eviction Summons and Proof of Service of Eviction Summons & Eviction Complaint (Form E-S 3507.3), proof-of-electronic-service-appellate, Form APP-009, Proof of Service (Appellate Division), Form APP-109, Proof of Service (Appellate Division), Form GC-020(P), PROOF OF PERSONAL SERVICE OF NOTICE OF HEARING— GUARDIANSHIP OR CONSERVATORSHIP, Form APP-109E, Proof of Electronic Service (Appellate Division), Proof of Personal Service of Notice of Initial Appearance—CARE Act Proceedings, Form CARE-116, Proof of Personal Service of Notice of Hearing—CARE Act Proceedings, Form CR-106, Proof of Service — Criminal Record Clearing, CARE-107, Proof of Personal Service of Notice of Order for CARE Act Report, Form CIV-120, Notice of Entry of Dismissal and Proof of Service, Form DAL-012, Proof of Service—Disability Access Litigation, Form DE-120(P), Proof of Personal Service of Notice of Hearing—Decedent's Estate or Trust, Form EA-200, Proof of Personal Service (Elder or Dependent Adult Abuse Prevention), Form EA-260, Proof of Service of Order After Hearing by Mail (Elder or Dependent Adult Abuse Prevention), Form FL-115, Proof of Service of Summons (Family Law—Uniform Parentage—Custody and Support)

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