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Form FL-343, Spousal, Domestic Partner, or Family Support Order Attachment, page 1
Basic · 44/100Form Complexity Index

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What this form asks for

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Form FL-343, Spousal, Domestic Partner, or Family Support Order Attachment, is a California Judicial Council form used in family law cases to provide the specific details of a court-ordered support arrangement. It attaches to a primary order, such as a Judgment (FL-180) or Findings and Order After Hearing (FL-340), to document the amount, duration, and other terms of spousal, domestic partner, or family support. This form is crucial for creating a clear, detailed, and legally enforceable support order. 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 fields106
Pages3
Form Complexity IndexBasic, 44/100

The AI checks your answers before you download

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

Header Information Consistency Across Pages

Ensures the 'PETITIONER', 'RESPONDENT', and 'CASE NUMBER' fields are filled and contain the exact same information on all three pages of the form. This is critical for document integrity and to ensure all pages are correctly associated with the same legal case. Mismatched information could lead to the form being rejected by the court clerk.

Requires Selection of Parent Document

Validates that at least one checkbox is selected in the 'TO' section on page 1, indicating which main order this form is an attachment to (e.g., FL-340, FL-180). If the 'Other' checkbox is selected, the corresponding text field must be filled out. This is mandatory for the form to have legal context and be filed correctly.

Ensures Exclusive Selection of Support Type

Verifies that either Item 1 (temporary support) or Item 2 (permanent support) is checked, but not both. These options are mutually exclusive and define the fundamental nature of the support order. An invalid selection makes the order ambiguous and unenforceable.

Validates Net Income Calculation for Temporary Support

Checks the financial figures in Item 1b. The value in 'Net monthly disposable income' must equal 'Total gross monthly income' minus 'Total monthly deductions' and 'Total hardship deductions'. This ensures mathematical accuracy in the financial data used to determine temporary support, preventing errors in the court's calculations.

Validates Format of Marriage or Partnership Duration

Ensures that the 'years' and 'months' fields in Items 2b and 2c contain only non-negative integers. Additionally, it validates that the 'months' value is less than 12. This maintains data integrity for a key factor in determining permanent support.

Validates Jurisdiction Termination Date

Checks that if a date is entered in Item 3c for when the court's jurisdiction over support ends, it is a valid date format and is set in the future. A past date would be logically incorrect and could create legal confusion. This ensures the order's prospective effect is clear.

And 8 more checks
  • Ensures Payor and Payee Are Different Parties
  • Verifies Logical Support Payment Dates
  • Ensures Conditional Payment Schedule Details are Complete
  • Requires Positive Integer for Earnings Assignment Stay
  • Cross-Validates Family Support Selections
  • Cross-Validates Attachment to Restraining Order
  • Requires Date for Party Stipulation
  • Ensures a Valid Support Amount is Entered

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How to Fill Out FL-343 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select Form FL-343.
  2. Use the AI assistant to automatically fill in the case caption, including Petitioner and Respondent names and the case number.
  3. Indicate which primary court order this form is an attachment to, such as a Judgment (FL-180) or Order After Hearing (FL-340).
  4. Specify whether the order is for temporary or permanent support, and provide the required financial details, such as income and deductions for each party.
  5. Clearly state the support amount, the start date for payments, the payment schedule, and the method of payment.
  6. Define the conditions for support termination, earnings assignment, and any other specific orders or agreements between the parties.
  7. Review all entered information for accuracy, then download the completed form to be filed with the court as part of your legal proceedings.

Common Mistakes in Completing FL-343

The ones the AI is built to catch.

Incomplete Header Information on Subsequent Pages
Users often meticulously fill out the Petitioner, Respondent, and Case Number on the first page but forget to repeat this information in the headers of pages 2 and 3. If the pages of the document become separated during court processing, the unidentifiable pages can be lost or disregarded, potentially leading to the rejection of the entire filing. To prevent this, double-check that the header on every single page is completed accurately before submission.
Confusing Temporary vs. Permanent Support Sections
A frequent error is filling out information in both Section 1 (Temporary Support) and Section 2 (Permanent Support), or filling out the incorrect one. These sections are mutually exclusive and are governed by different legal standards, so selecting the wrong one can lead to an order that does not reflect the court's actual ruling or the parties' agreement. Carefully determine if the order is for temporary support (pre-judgment) or permanent support (in a final judgment) and complete only the corresponding section.
Ambiguous Payor and Payee Designation
In Section 4a, users must clearly designate which party is the payor and which is the payee by checking the appropriate 'petitioner' or 'respondent' box for each role. A common mistake is to leave one or both of these blank, or to check both boxes for a single role, which makes the order ambiguous and unenforceable. To avoid this, carefully select one party to pay and one party to receive support, ensuring the order is legally clear.
Critical Error in Selecting Jurisdiction Option
In Section 3, accidentally checking box 3b ('The court terminates jurisdiction') when the intent was to reserve it (3a) is a catastrophic error. Terminating jurisdiction permanently prevents the supported party from ever requesting that support again, even if circumstances change drastically. This mistake is often irreversible and has profound financial consequences, so these boxes must be reviewed with extreme care.
Inaccurate Calculation of Marriage or Partnership Length
Users sometimes miscalculate or estimate the length of the marriage/partnership in Section 2b/2c. In California, the duration of the marriage, particularly whether it crosses the 10-year threshold, is a critical factor that affects the court's ability to set an end date for support. An inaccurate calculation can lead to significant disputes and unintended long-term financial obligations or limitations.
Incorrect or Incomplete Financial Data
When filling out the income details in Section 1b, people often confuse gross and net income, use estimates instead of actual figures from pay stubs, or miscalculate deductions. These errors lead directly to an incorrect calculation of guideline support, resulting in a support order that is either too high or too low. It is crucial to use precise figures from recent financial documents to ensure the calculation is accurate.
Omitting Required Attachments
The form allows users to reference other documents by checking boxes like 1c (computer calculation printout) or 2d(3)(A) (attachment for 4320 factors). A common oversight is checking the box but failing to physically attach the corresponding document to the filing. This makes the order incomplete and can lead to rejection by the court clerk or a legal challenge from the other party for being unsubstantiated.
Failing to Specify the Attached Document Type
At the very top of the form, users must check a box to indicate which primary court order this form is an attachment to (e.g., FL-340, FL-180). Neglecting to check any box leaves the context of the support order unclear, which can cause confusion and processing delays. Always ensure you specify whether this attachment is part of a temporary order, a final judgment, or another specified order.
Vague or Ambiguous Custom Agreement Terms
In sections that allow for custom text, such as 6b (custom termination agreement) or 11 (Other orders), parties often write terms that are vague or open to interpretation. For example, writing 'support ends when payee is financially stable' is ambiguous and invites future conflict and litigation. Any custom terms must be drafted with absolute clarity, using specific dates, events, and amounts to be enforceable and avoid future disputes.
Leaving Payment Term Details Blank
Section 4 requires specific details about the support payment, including the start date (4b) and payment frequency/due date (4c). People sometimes leave these fields blank, assuming a default will apply. This creates uncertainty and can lead to disputes about when the first payment was due or whether a payment is late, making enforcement difficult.

Frequently Asked Questions About FL-343

 

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How does the AI fill out FL-343?
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-343, 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-343 to fill out?
FL-343 has a Form Complexity Index of 44 out of 100, in the basic tier: 106 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.
What is Form FL-343 used for?
Form FL-343 is a California court form used to detail the specific terms of a spousal, domestic partner, or family support order. It is an attachment that provides the details for a primary order, such as a Judgment (FL-180) or an Order After Hearing (FL-340).
Who needs to complete this form?
This form is completed to document a court's decision or a couple's agreement regarding support. It is typically filled out by the parties' attorneys or the judge as part of a divorce, legal separation, or domestic partnership dissolution case.
What is the difference between temporary support (Section 1) and permanent support (Section 2)?
Temporary support is ordered while a case is ongoing and is based primarily on income and need. Permanent support is ordered as part of the final judgment and considers numerous factors listed in Family Code section 4320, such as the length of the marriage and standard of living.
What financial information do I need for Section 1?
For temporary support, you must provide each party's total gross monthly income, monthly deductions, and any hardship deductions to determine net disposable income. Alternatively, you can attach a computer calculation printout with this information.
What are the Family Code section 4320 factors mentioned in Section 2?
These are the legal factors a court must consider when ordering permanent spousal support. They include the length of the marriage, each party's earning capacity, age and health, and the standard of living during the marriage, among others.
What is an 'earnings assignment' in Section 5?
An earnings assignment is a court order directing the paying party's employer to deduct support payments directly from their wages. This is the standard method for ensuring consistent support payments in California.
What does it mean for the court to 'terminate jurisdiction' over support?
When the court terminates jurisdiction, it permanently gives up its power to make any future orders for spousal support. This is a final decision that prevents either party from requesting support in the future.
Under what conditions does support automatically end?
According to Section 6, support payments automatically terminate when either party dies, or when the person receiving support remarries or registers a new domestic partnership, unless the parties have a written agreement stating otherwise.
Do I have to notify my ex-partner if I get a new job?
Yes, Section 8 of the form requires both parties to inform each other in writing of any change in employment within 10 days. This notice must include the new employer’s name, address, and telephone number.
What happens if support payments are late?
The notice at the end of the form states that any party required to pay support must also pay interest on overdue amounts at the legal rate, which is currently 10 percent.
Can I use an AI tool to help fill out Form FL-343?
Yes, services like Instafill.ai use AI to help you accurately auto-fill form fields with your case information, saving time and reducing the risk of errors. This is especially useful for entering names, case numbers, and other repeating data.
How can I fill out this form online using Instafill.ai?
To fill out Form FL-343 online, you can upload the PDF to Instafill.ai. The platform will make it an interactive, fillable form that you can complete, save, and print from any device.
The PDF of Form FL-343 I downloaded is not fillable. What should I do?
If you have a non-fillable or 'flat' PDF, you can use a service like Instafill.ai to make it interactive. Simply upload the file, and their technology will convert it into a fillable form you can complete online.
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