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Yes! You can use AI to fill out Form DE-135, Proof of Holographic Instrument

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Form DE-135, Proof of Holographic Instrument, page 1
Basic · 35/100Form Complexity Index

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What this form asks for

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Form DE-135, the Proof of Holographic Instrument, is a legal document used in California probate proceedings to validate a handwritten will. A person familiar with the deceased's handwriting signs this declaration under penalty of perjury to confirm that the will was genuinely written and signed by the decedent. This testimony is essential for the court to accept the holographic will as legally valid. 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 fields35
Pages1
Form Complexity IndexBasic, 35/100

The AI checks your answers before you download

12 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Case Number Presence and Format

This check ensures the 'CASE NUMBER' field is not empty and, if possible, conforms to the standard format for California court cases. The case number is the primary identifier for court filings, and its absence or incorrectness would lead to the document being rejected or misfiled. If the validation fails, the user should be prompted to enter a valid case number before submission.

Decedent Name Is Required

Validates that the 'ESTATE OF (Name)' field has been completed. This field identifies the decedent whose holographic instrument is being proven, which is the central purpose of the form. A submission without the decedent's name is fundamentally incomplete and cannot be processed by the court.

Basis of Knowledge Selection

Ensures that at least one of the checkboxes under question 3 ('a', 'b', 'c', or 'd') is selected. The declarant must specify how they have personal knowledge of the decedent's handwriting for their testimony to be valid. Failure to select an option invalidates the declaration, so the form should not be submittable until a choice is made.

Conditional Requirement for Knowledge Details

This is a logical check that verifies if checkboxes 3b, 3c, or 3d are selected, the corresponding 'specify' text field must contain text. These fields provide the necessary details to support the selected basis of knowledge. If a checkbox is ticked but the explanation is missing, the submission should be flagged for incompleteness.

Attachment 4 Presence Verification

Confirms that a document designated as 'Attachment 4' has been uploaded or included with the form submission. The form explicitly states to 'Affix a copy of the instrument as Attachment 4,' making this the most critical piece of evidence. A submission without this attachment is useless and must be rejected.

Declarant Signature Date Validity

Checks that the 'Date' field in the main declaration section is filled with a valid date that is not in the future. The date establishes when the declaration was made under penalty of perjury. An invalid or future date would compromise the legal standing of the document, requiring the user to correct it.

And 6 more checks
  • Declarant Information Completeness
  • Attorney/Party Header Information
  • California State Bar Number Format
  • Court County Specification
  • Acquaintance Duration Is a Positive Number
  • Attorney Certification Completeness

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How to Fill Out DE-135 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select the Form DE-135, Proof of Holographic Instrument.
  2. Provide the court and case information, including the California county, court address, estate name, and case number.
  3. Enter your information as the declarant, including your name, address, and your relationship and length of acquaintance with the decedent.
  4. Specify how you acquired knowledge of the decedent's handwriting by selecting the appropriate option and providing details as required.
  5. Confirm that you have examined the attached copy of the holographic instrument and that it was written and signed by the decedent. Ensure a copy is attached as Attachment 4.
  6. Review all the information populated by the AI for accuracy. Once verified, date and sign the declaration.
  7. If you are an attorney, complete the Attorney's Certification section before downloading the completed form for filing with the court.

Common Mistakes in Completing DE-135

The ones the AI is built to catch.

Forgetting to Attach the Holographic Instrument
Item 4 explicitly requires the filer to 'Affix a copy of the instrument as Attachment 4.' This is the most critical and common mistake. People either forget to include the attachment or assume the court already has a copy. Without the copy of the will or codicil, the entire 'Proof of Holographic Instrument' form is meaningless and will be rejected by the court, causing significant delays in the probate process. Always double-check that a clear, complete, and legible copy of the instrument is attached before submission.
Providing Insufficient Basis of Handwriting Knowledge
Section 3 requires the declarant to explain how they have personal knowledge of the decedent's handwriting. A common error is providing vague, conclusory, or circular statements like 'I just know it' or 'I saw them write.' The court needs specific facts to establish credibility. This mistake can lead the court to disregard the proof. To avoid this, provide concrete examples, such as 'I received weekly, handwritten letters from the decedent from 2015 to 2020' or 'I witnessed the decedent handwrite and sign their 5-page lease agreement on June 1, 2018.'
Missing or Incorrect Case Number
The 'CASE NUMBER' field is essential for the court clerk to link the document to the correct probate proceeding. Filers, especially those without an attorney, often leave this blank because they don't know it or can't find it. Submitting a form without the correct case number guarantees it will be rejected or misfiled, halting progress on the case. To prevent this, always copy the exact case number from the initial probate petition or other official court documents.
Invalid or Missing Signatures and Dates
This form has two separate signature blocks: one for the declarant and one for the attorney's certification. A frequent mistake is forgetting to sign or date one or both sections, or signing in the wrong place. An unsigned or undated declaration is legally invalid and will be rejected by the court. Carefully review the completed form to ensure the declarant has signed, printed their name, and dated their declaration, and that the attorney has done the same in their certification section.
Incorrect Court Branch Information
Many counties have multiple court branches, with specific locations designated for probate matters. A common error is to list the main county courthouse address instead of the specific branch name and address. This can cause the document to be mailed to the wrong location, leading to significant filing delays or the document being lost. Before filling out the form, verify the exact street address, mailing address, and branch name for the court handling the specific probate case from the court's official website.
Improper Attorney Certification
The 'ATTORNEY'S CERTIFICATION' section has specific legal requirements. It must be signed by an active member of The State Bar of California who is certifying the attached copy. Mistakes include having a paralegal, the declarant, or an inactive/out-of-state attorney sign this section. This invalidates the certification and can cause the court to question the authenticity of the attached will. Only a qualified, active California attorney should complete this section after personally comparing the copy to the original instrument.
Illegible Handwriting on a Printed Form
This form is often provided as a non-fillable PDF, leading people to print it and complete it by hand. Illegible handwriting can make names, addresses, dates, and other crucial details unreadable to the court clerk. This can result in the form being rejected or, worse, incorrect information being entered into the official court record. To avoid this, use a service like Instafill.ai, which can convert flat PDFs into fillable forms, allowing you to type your answers for maximum clarity before printing for signature.
Incomplete Attorney or Party Information
The box at the top-left of the form requires the filer's full name, address, phone number, and, if an attorney, their state bar number. People often rush and leave parts of this section blank. If the court has a question or needs to send a notice, incomplete information makes it impossible for them to contact the filer, leading to delays or missed deadlines. Using an AI-powered tool like Instafill.ai can help prevent this by saving your contact information and automatically populating it correctly every time.
Confusing the 'ATTORNEY FOR (Name)' Field
This field often causes confusion. Filers sometimes put their own name, the decedent's name, or the attorney's name here. This field is meant for the name of the party the attorney is representing in the probate case, such as the petitioner or administrator of the estate. An error here can cause confusion in the court records about who is being represented. The correct name should be taken from the main probate petition.
Vague Relationship and Acquaintance Details
In items 1 and 2, the form asks for the number of years the declarant knew the decedent and their relationship. People often provide vague answers like 'many years' or 'friend.' These answers lack the specificity needed to establish the declarant's credibility and close relationship with the decedent. The court may find the proof less persuasive as a result. Be precise: state the exact number of years and specify the relationship clearly, for example, 'First cousin' or 'Business partner and close friend.'

Frequently Asked Questions About DE-135

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 1 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your DE-135.
Can I fill other forms too?
This plan is for your DE-135: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
From your account, in two clicks, any time. No email, no call.
How does the AI fill out DE-135?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of DE-135, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is DE-135 to fill out?
DE-135 has a Form Complexity Index of 35 out of 100, in the basic tier: 35 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 the Proof of Holographic Instrument form (DE-135)?
This form is used in California probate court to prove that a handwritten will or legal document (a "holographic instrument") was genuinely written and signed by the deceased person.
What exactly is a 'holographic instrument'?
A holographic instrument is a will or an amendment to a will (codicil) that is written entirely in the handwriting of the person making it (the testator or decedent).
Who is supposed to fill out this form?
This form should be completed by a person who has personal knowledge of the decedent's handwriting and can confirm the document was written by them. This person does not need to be a beneficiary of the will.
What do I need to attach to this form?
You must attach a complete and clear copy of the holographic instrument (the handwritten will) to this form as 'Attachment 4'. An attorney may also need to certify that it is a true copy.
How do I explain my knowledge of the decedent's handwriting in Section 3?
You must check the box that best describes how you know their handwriting, such as seeing them write, receiving letters from them, or seeing other documents they wrote. Be prepared to provide specific details where the form asks for them.
Do I need an attorney for the 'Attorney's Certification' section?
While you sign the main declaration, an active member of the State Bar of California typically completes the Attorney's Certification. This certifies that the attached document is a true photographic copy of the original presented for probate.
Where do I file the completed DE-135 form?
The completed form should be filed with the Superior Court of California in the county where the probate case for the decedent's estate is located.
Can I fill this out if I am a relative of the deceased?
Yes, being a relative does not disqualify you. Section 2 of the form specifically asks you to state your relationship to the decedent.
What does it mean to declare 'under penalty of perjury'?
This is a serious legal statement confirming that all the information you have provided is true and correct. Knowingly providing false information can lead to significant legal consequences.
What happens after this form is submitted to the court?
The court reviews this form as evidence to help validate the handwritten will. It is a critical step in the process of having the will officially accepted by the court for probate.
Can AI tools help me complete this form?
Yes, services like Instafill.ai use AI to accurately auto-fill form fields like your name, address, and case information, which saves time. However, you must personally attest to your knowledge of the decedent's handwriting.
How can I fill out the DE-135 form online?
You can use a service like Instafill.ai to upload the form and fill it out on your computer. Their platform allows you to type directly into the fields, save your progress, and ensure it's complete before printing.
The PDF of this form I found isn't fillable. What should I do?
If you have a non-fillable 'flat' PDF, you can upload it to a service like Instafill.ai. Their technology can convert it into an interactive, fillable form that you can easily complete online.
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