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Yes! You can use AI to fill out Form FL-100, Petition—Marriage/Domestic Partnership (Family Law)

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Form FL-100, Petition—Marriage/Domestic Partnership (Family Law), page 1
Complex · 64/100Form Complexity Index

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What this form asks for

The AI fills all of it, from your answers or your documents.

Form FL-100 (Petition—Marriage/Domestic Partnership) is the primary pleading used in California to open a case for dissolution (divorce), legal separation, or nullity involving a marriage or domestic partnership. It identifies the parties, confirms basic jurisdiction/residency facts, lists minor children (and triggers required attachments like the UCCJEA form FL-105 when applicable), and states what orders the petitioner is asking the court to make regarding custody/visitation, child support, spousal/partner support, and property. Filing this petition is important because it formally begins the court process and sets the scope of issues to be decided. 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 fields158
Pages3
Sections41
Form Complexity IndexComplex, 64/100

The AI checks your answers before you download

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

Validates that exactly one primary case type is selected (Divorce, Legal Separation, or Nullity)

Checks that the filer selects one—and only one—of the primary petition types: Dissolution (Divorce), Legal Separation, or Nullity. Selecting multiple (or none) makes the requested relief ambiguous and can cause rejection or require amendment. If validation fails, the system should block submission and prompt the user to choose exactly one primary case type.

Validates that the relationship type is consistent with the selected case type (Marriage vs Domestic Partnership)

Ensures at least one legal relationship box is checked (married, domestic partnership established in CA, or domestic partnership not established in CA) and that it aligns with the petition’s subject (marriage and/or domestic partnership). This is important because the court’s jurisdiction and required dates differ depending on whether the parties are married or registered domestic partners. If inconsistent (e.g., only domestic partnership checked but marriage dates provided as the basis), the system should flag the mismatch and require correction.

Residence requirement eligibility check (standard residency vs exceptions)

Verifies that residency requirements are satisfied for a divorce unless an exception applies (e.g., CA domestic partnership dissolution exception or same-sex marriage non-recognition exception). If the standard residency path is used, at least one of Petitioner/Respondent residency boxes must be checked; if an exception is checked, the system should require the related supporting fields (e.g., where each party lives, county where married). If validation fails, the system should prevent filing because the court may lack jurisdiction.

Court venue fields completeness and format validation

Checks that Superior Court county is provided and that court location fields (branch name, street address, city/ZIP, mailing address) are complete when required by the filing workflow. Proper venue and court identification are necessary for routing and docketing. If missing or malformed (e.g., city without ZIP), the system should require completion before submission.

Party identification completeness (Petitioner and Respondent full legal names)

Ensures Petitioner Name and Respondent Name are both present and appear to be full names (not blank, not identical, not placeholders like 'N/A'). Correct party identification is essential for service, case indexing, and matching to existing records. If validation fails, the system should block submission and request corrected names.

Attorney vs self-represented consistency check (State Bar Number and attorney fields)

If a State Bar Number is provided, validates that attorney name and contact fields are also provided and that the bar number matches an expected pattern (typically 4–8 digits for CA). If no bar number is provided, the system should treat the filer as self-represented and avoid requiring firm fields unless entered. If inconsistent (e.g., bar number present but attorney name missing), the system should flag and require correction to avoid improper representation details.

And 10 more checks
  • Contact information format validation (email, phone, fax, state, ZIP)
  • Marriage and separation date format and chronology validation
  • Domestic partnership registration and separation date validation
  • Duration fields consistency check (Years/Months vs provided dates)
  • Minor children section mutual exclusivity and required child details
  • UCCJEA attachment requirement check (FL-105) when minor children are present
  • Child custody/visitation orders require children and a custody selection
  • Legal grounds selection validation (Divorce/Legal Separation vs Nullity grounds)
  • Spousal/partner support request logical consistency (terminate vs pay vs reserve)
  • Property declarations consistency (separate property and community property sections)

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How to Fill Out FL-100 Online for Free in 2026

What the AI walks you through.

  1. Go to Instafill.ai and upload the FL-100 PDF (or search/select “FL-100 Petition—Marriage/Domestic Partnership”).
  2. Enter case and party details: petitioner/respondent names, attorney information (if any), and the Superior Court county/branch and addresses.
  3. Use the guided prompts to select the legal relationship and the type of case being filed (divorce/dissolution, legal separation, or nullity; marriage vs. domestic partnership) and confirm residency/jurisdiction options.
  4. Provide statistical facts (dates of marriage/registration and separation, length of relationship) and complete the minor-children section; if there are minor children, add the required attachment information (e.g., FL-105 UCCJEA).
  5. Specify requested orders for custody/visitation (and reference any applicable add-on forms like FL-311/FL-312/FL-341 series), child support, and spousal/domestic partner support (including termination or reservation requests).
  6. List property requests: separate property to confirm and community/quasi-community property to divide, referencing Property Declaration (FL-160) and any attachments as needed; add other requests such as attorney’s fees or name restoration.
  7. Let Instafill.ai validate for missing fields and inconsistencies, then generate the final completed form for e-signature/printing and filing with the court.

Common Mistakes in Completing FL-100

The ones the AI is built to catch.

Checking the wrong case type (Divorce vs. Legal Separation vs. Nullity) or relationship type
People often check multiple boxes or the wrong set of boxes under “Petition For” and “Legal Relationship” because the form lists marriage and domestic partnership options side-by-side. This can lead to the clerk rejecting the filing or the court processing the case under the wrong legal framework, causing delays and amended filings. Avoid this by selecting only the boxes that match your situation (e.g., divorce of marriage vs. dissolution of domestic partnership) and confirming whether you are seeking dissolution, legal separation, or nullity. AI-powered form filling tools like Instafill.ai can help prevent conflicting selections by validating that your checked boxes are logically consistent.
Leaving the residence requirement section incomplete or checking the wrong exception
A very common error is failing to check whether the Petitioner or Respondent meets the 6-month California and 3-month county residency requirement, or incorrectly checking the domestic partnership/same-sex marriage exceptions. If residency is not properly established (or an exception is misapplied), the court may reject the petition or you may have to refile in the correct county/state. Avoid this by verifying dates of physical residence and selecting the correct box (2a, 2b, or 2c) that actually applies to your relationship and location. Instafill.ai can flag missing residency checkboxes and prompt for the required county/state details before submission.
Incorrect or inconsistent marriage/partnership and separation dates (and duration math)
People frequently enter a separation date that is earlier than the marriage/registration date, use an informal “trial separation” date without clarity, or forget to fill in the years/months duration fields consistently. Inconsistent dates can create credibility issues, complicate property characterization, and trigger clerk/court questions that slow the case. Avoid this by using the legally intended separation date (when you separated with intent not to resume the relationship) and ensuring the “Years” and “Months” fields match the dates entered. Instafill.ai can automatically calculate durations and validate that dates follow a logical timeline and correct format.
Not attaching required child-related forms (UCCJEA FL-105) when minor children exist
When parties have minor children, many filers check “The minor children are” but forget to attach the required UCCJEA declaration (FL-105) or leave it blank. Missing FL-105 commonly results in a rejected filing or the court refusing to make custody/visitation orders until it is provided. Avoid this by always preparing and attaching FL-105 whenever any minor child is listed, and ensuring the child information matches across forms. If you’re working from a flat, non-fillable PDF, Instafill.ai can convert it into a fillable version and help ensure required attachments like FL-105 are included.
Child information entry errors (names, birthdates, ages) and forgetting “unborn child” selection
Common mistakes include using nicknames instead of legal names, entering ages that don’t match birthdates, or using inconsistent date formats across children. These errors can cause confusion in custody/support processing and may require corrections or additional hearings. Avoid this by copying names exactly as on birth certificates and using a consistent date format (e.g., MM/DD/YYYY) while ensuring ages align with birthdates as of the filing date. Instafill.ai can standardize date formats and cross-check age vs. birthdate to reduce these avoidable inconsistencies.
Requesting custody/visitation orders without selecting the supporting schedule/attachment form
Filers often check custody/visitation boxes (legal custody, physical custody, parenting time) but fail to indicate which detailed form is attached (FL-311, FL-312, FL-341(C)/(D)/(E), or Attachment 6c(1)). Without a detailed parenting plan, the court may not be able to issue clear orders, leading to continuances or requests for additional paperwork. Avoid this by attaching the appropriate custody/visitation schedule form and ensuring it matches what you checked on FL-100. Instafill.ai can prompt you to add the correct supporting form when custody/visitation boxes are selected.
Spousal/domestic partner support selections that conflict or are misunderstood (terminate vs. reserve vs. request)
People frequently check “terminate the court’s ability to award support” without realizing it can permanently waive future support, or they check multiple options that don’t make sense together (e.g., terminate and reserve). The consequence can be losing the ability to seek support later or creating ambiguity that requires amendment. Avoid this by deciding whether you want support now, want the issue reserved for later, or truly want the court’s power terminated—and select only the option that matches that intent. Instafill.ai can warn about conflicting support selections and help ensure the chosen option aligns with your stated goal.
Property sections left blank or incorrectly marked as “none” despite having assets/debts
A frequent issue is checking “There are no such assets or debts” for separate property (item 9) or community/quasi-community property (item 10) even when the parties have bank accounts, retirement plans, vehicles, credit cards, or other debts. This can lead to incomplete orders, later disputes, or the need to reopen property issues, which is costly and time-consuming. Avoid this by listing all known assets and debts or attaching the correct Property Declaration (FL-160) and/or Attachment 10b/9b as indicated. Instafill.ai can help by prompting for common asset/debt categories and ensuring the correct attachments are included when “listed in Property Declaration” is selected.
Missing or incorrect party/attorney identification details (names, bar number, contact info)
People often leave the attorney section partially filled (or fill it out when self-represented), omit the State Bar number, or enter inconsistent party names compared to other filings. These errors can cause clerk rejections, service problems, and confusion in case indexing. Avoid this by completing either the “Party without attorney” information accurately or the attorney block fully, and using full legal names consistently throughout the case. Instafill.ai can auto-format phone/ZIP/state abbreviations and reduce omissions by validating required identity fields.
Forgetting to attach the voluntary declaration of parentage/paternity when applicable
The form notes that if a voluntary declaration of parentage/paternity was signed, a copy should be attached if available, but many filers overlook this instruction. Missing documentation can complicate parentage findings and delay custody/support orders, especially when a child was born before marriage/partnership. Avoid this by locating the declaration and attaching a copy, or noting its unavailability and being prepared to provide it later if requested. Instafill.ai can remind you to upload and attach supporting documents when you indicate a declaration exists.
Signature/date problems (missing signature, wrong signer, or undated declaration)
A classic filing-stopper is forgetting to sign and date the petition, typing a name without an actual signature, or having the attorney sign when the petitioner’s signature is required (or vice versa). The court may reject the filing outright or require a corrected, re-filed petition. Avoid this by confirming the petitioner signs and dates in the correct signature block and that any attorney signature is completed only where applicable. Instafill.ai can flag missing signature/date fields before you print/file and help ensure the final output is complete and properly formatted.

Frequently Asked Questions About FL-100

 

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How does the AI fill out FL-100?
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 FL-100, 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 FL-100 to fill out?
FL-100 has a Form Complexity Index of 64 out of 100, in the complex tier: 158 fillable fields across 3 pages. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
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Other forms like this one

family law forms: Form 12.902(b), Family Law Financial Affidavit (Short Form), Florida Supreme Court Approved Family Law Form 12.901(b)(3), Petition for Dissolution of Marriage with No Dependent or Minor Child(ren) or Property (02/18), Form FL-170, Declaration for Default or Uncontested Dissolution or Legal Separation (Family Law), declaration-of-marriage-for-court-proceeding-california-family-law, Florida Supreme Court Approved Family Law Form 12.902(d), Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) Affidavit, Florida Family Law Rules of Procedure Form 12.910(a), Summons: Personal Service on an Individual, Florida Supreme Court Approved Family Law Form 12.941(a), Petition for Enforcement of Out-of-State Custody Decree and for Order to Pick Up Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.970(a), Petition for Temporary Custody by Extended Family, Form FL-110, Summons (Family Law), Form FL-120, Response—Marriage/Domestic Partnership (Family Law), ADOPT-200, Adoption Request, ADOPT-200, Stepparent Adoption Request, ADOPT-210, Adoption Agreement, ADOPT-310, Contact After Adoption Agreement, Adoption Assistance Program Nonrecurring Adoption Expense Agreement and Claim, Adoption Request (Stepparent), Adoption and Safe Families Act (ASFA) Survey, Florida Family Law Rules of Procedure Form 12.900(b), Notice of and Consent to Limited Appearance, Florida Family Law Rules of Procedure Form 12.900(d), Termination of Limited Appearance, Florida Family Law Rules of Procedure Form 12.900(e), Acknowledgment of Assistance by Attorney

domestic partnership forms: Form FL-107, Petition—Marriage/Domestic Partnership, Form FL-120, Response—Marriage/Domestic Partnership (Family Law)

family petition forms: Florida Supreme Court Approved Family Law Form 12.901(b)(3), Petition for Dissolution of Marriage with No Dependent or Minor Child(ren) or Property (02/18), Florida Supreme Court Approved Family Law Form 12.941(a), Petition for Enforcement of Out-of-State Custody Decree and for Order to Pick Up Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.970(a), Petition for Temporary Custody by Extended Family, Florida Family Law Rules of Procedure Form 12.901(a), Joint Petition for Simplified Dissolution of Marriage, Florida Supreme Court Approved Family Law Form 12.903(b), Answer to Petition for Dissolution of Marriage, Florida Supreme Court Approved Family Law Form 12.903(c)(1), Answer to Petition and Counterpetition for Dissolution of Marriage with Dependent or Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.903(e), Answer to Supplemental Petition, Florida Supreme Court Approved Family Law Form 12.904(a)(2), Petition for Support and Parenting Plan Unconnected with Dissolution of Marriage with Dependent or Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.904(b), Petition for Support Unconnected with Dissolution of Marriage with No Dependent or Minor Child(ren), Florida Supreme Court Approved Family Law Form 12.905(a), Supplemental Petition to Modify Parental Responsibility, Visitation or Parenting Plan / Time-Sharing Schedule and Other Relief, Florida Supreme Court Approved Family Law Form 12.905(b), Supplemental Petition for Modification of Child Support, Florida Supreme Court Approved Family Law Form 12.905(c), Supplemental Petition for Modification of Alimony, Form FL-220, Response to Petition to Determine Parental Relationship (Uniform Parentage), Form FL-210, Summons (Uniform Parentage—Petition for Custody and Support), Form FL-200, Petition to Determine Parental Relationship (Uniform Parentage), Form FL-260, Petition for Custody and Support of Minor Children, Form FL-270, Response to Petition for Custody and Support of Minor Children, Florida Supreme Court Approved Family Law Form 12.983(a), Petition to Determine Paternity and for Related Relief

partnership forms: Form 1065, U.S. Return of Partnership Income, Form 8865, Return of U.S. Persons With Respect to Certain Foreign Partnerships, Form 1065, U.S. Return of Partnership Income, Form FL-107, Petition—Marriage/Domestic Partnership, Form 1065, U.S. Return of Partnership Income, Partnership Tax Return 2019 (NAT 0659), Form 1065, U.S. Return of Partnership Income, Partnership HealthPlan of California Doula Application, Form FL-120, Response—Marriage/Domestic Partnership (Family Law)

marriage forms: Form 12.901(a), Petition for Simplified Dissolution of Marriage, Form 12.901(b)(2), Petition for Dissolution of Marriage, Form 12.901(b)(1), Petition for Dissolution of Marriage, Form 12.901(b)(3), Petition for Dissolution of Marriage, Florida Supreme Court Approved Family Law Form 12.901(b)(3), Petition for Dissolution of Marriage with No Dependent or Minor Child(ren) or Property (02/18), Form FL-107, Petition—Marriage/Domestic Partnership, Diocese of Raleigh Information For Automated Marriage Forms and Application for Dispensations/Permissions, Official Certificate of Marriage, Section 50(1)(b) of the Marriage Act 1961 (Cth), form-nc-120-petition-to-establish-fact-date-and-place-of-marriage, declaration-of-marriage-for-court-proceeding-california-family-law, Form FL-120, Response—Marriage/Domestic Partnership (Family Law), Supreme Court of Ohio Uniform Domestic Relations Form 17, Petition for Dissolution of Marriage and Waiver of Service of Summons

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