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Yes! You can use AI to fill out Form FL-350, Stipulation to Establish or Modify Child Support and Order

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Form FL-350, Stipulation to Establish or Modify Child Support and Order, page 1
Moderate · 59/100Form Complexity Index

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Form FL-350, Stipulation to Establish or Modify Child Support and Order, is a mandatory legal document in California used when parents with an existing court case reach an agreement on child support terms. It formalizes the details of basic support, additional costs like healthcare and childcare, and financial information, which must then be filed and approved by a judge to become an official court order. This ensures the agreement is legally binding and in the child's best interest. 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 fields180
Pages3
Form Complexity IndexModerate, 59/100

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.

Case Number Consistency Across Pages

This check ensures that the 'CASE NUMBER' field is filled out and contains the exact same value on all pages of the form (pages 1, 2, and 3). This is critical for ensuring all pages of the stipulation are correctly associated with the same legal case upon filing. A mismatch could lead to rejection by the court clerk or incorrect processing of the order.

Mutually Exclusive Party Role Assignment

Validates that in Section 1, each of the two agreeing parties has selected a unique role (Petitioner, Respondent, or Other Party). The system should prevent both parties from selecting the same role. This is important for legal clarity and to ensure the order correctly identifies the distinct legal standing of each individual in the case.

Child Information Completeness and Validity

For each child listed in Section 2a, this check verifies that the child's name, a valid date of birth (in the past), and a valid monthly support amount are all provided. Missing or invalid information for any child would make the support order unenforceable for that child. The validation prevents incomplete agreements from being submitted.

Basic Child Support Calculation Accuracy

This validation automatically calculates the sum of the 'Monthly amount' fields for all children listed in Section 2a and compares it to the value entered in the 'Total' basic child support field. This prevents mathematical errors that could lead to incorrect support payments. If the user-entered total does not match the calculated sum, an error is flagged for correction.

Parenting Time Percentage Summation

Verifies that the two parenting time percentages entered in Section 6 add up to exactly 100%. The parenting time split is a key factor in the state's guideline support calculation, so an incorrect total would lead to an inaccurate guideline amount. This check ensures the foundational data for the support calculation is logically sound.

Financial Information Method Selection

Ensures that the parties have selected only one method for providing financial data by either checking the box for item 4 (attaching a computer printout) OR filling in the income details in item 5, but not both. This prevents ambiguity and conflicting information. The check also ensures that if item 5 is used, the corresponding parenting time in item 6 is also completed.

And 8 more checks
  • Guideline Agreement Exclusivity
  • Non-Guideline Agreement Justification
  • Conditional LCSA Approval Signature
  • Additional Support Payment Method Logic
  • Additional Support Percentage Sum
  • Party Signature and Role Verification
  • Child Support Start Date Format and Logic
  • Total Monthly Support Calculation

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How to Fill Out FL-350 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload your FL-350 form or select it from the library of official documents.
  2. Use the AI assistant to input the attorney, party, court, and case number information at the top of the form.
  3. Detail the child support agreement in section 2, specifying which parent pays, the children's names, and the monthly support amounts.
  4. Indicate how additional costs for healthcare, childcare, and other expenses will be shared, and designate which parent will provide health insurance.
  5. Enter the financial information for both parents, including net monthly disposable income and parenting time percentages, or attach a computer calculation printout.
  6. Review all entered information for accuracy, then have all parties (and attorneys, if applicable) sign and date the stipulation.
  7. Download the completed and signed FL-350 to file with the appropriate California Superior Court for a judge's approval and signature.

Common Mistakes in Completing FL-350

The ones the AI is built to catch.

Incomplete or Incorrect Case Information
Parties often forget to enter the full, correct case number or court information at the top of each page. This mistake happens due to oversight or assuming the first page is sufficient. An incorrect or missing case number can lead to the document being rejected by the court clerk or misfiled, causing significant delays in processing the child support order. Always double-check the case number and court details against official court documents before filing.
Calculation Errors in Support Amounts
Simple arithmetic mistakes are common when totaling the basic child support for multiple children (item 2a) or calculating the total monthly payment (item 2c). These errors can lead to an incorrect court order, financial confusion, and future legal disputes. It is crucial to use a calculator and carefully re-check all figures before signing the form. AI-powered tools like Instafill.ai can help prevent this by performing calculations automatically.
Conflicting Selections for Additional Support Costs
In section 2b, parties mistakenly select both a percentage split and a fixed dollar amount for the same expense, or the percentages chosen for an expense do not total 100%. This creates an ambiguous and unenforceable term in the court order. To avoid this, parties must clearly agree on either a percentage split (e.g., 50/50) or a specific dollar contribution for each additional expense, but not both for the same item.
Failure to Attach Required Documents
The form requires attaching other documents under certain conditions, such as a computer-generated support calculation (item 4) or the 'Notice of Rights' (item 16). Parties frequently check the box but forget to include the actual attachment with their filing. This results in an incomplete submission that the court will reject, delaying the finalization of the support order. Create a checklist of all required attachments before submitting the packet to the court.
Incorrectly Determining Net Disposable Income
In item 5, parties often enter their simple take-home pay, not the legally defined 'net monthly disposable income,' which requires specific statutory deductions. This fundamental error skews the entire guideline calculation (item 8), potentially leading to an unfair or legally challengeable agreement. To avoid this, use the official California Child Support Calculator or consult a legal professional to ensure the income figures are correct.
Inconsistent Guideline vs. Non-Guideline Entries
The form requires stating the guideline support amount (item 8) even if you are agreeing to a different amount (item 10). A common mistake is to fill out item 10 for a non-guideline agreement but leave item 8 blank. A judge cannot approve a deviation from the guideline without knowing what the guideline amount is, so this omission will cause the stipulation to be rejected as incomplete.
Vague Justification for Deviating from Guideline
When agreeing to a non-guideline support amount (item 10), parties must provide a specific reason why the guideline is 'unjust or inappropriate.' Simply writing 'we agree' is insufficient and will likely lead to rejection by the judge. The justification must clearly explain the special circumstances of the case and why the agreed-upon amount is in the children's best interest.
Missing Signatures, Dates, or Party Roles
Forgetting to sign, date, or check the correct box (Petitioner/Respondent) in the signature section is a frequent and critical error. An unsigned or improperly executed agreement is invalid and will be immediately rejected by the court. Each party must sign, date, and correctly identify their role on the form to create a legally binding stipulation. If the form is a non-fillable PDF, a tool like Instafill.ai can convert it to a fillable version to ensure all fields are completed before printing.
Ignoring the Local Child Support Agency (LCSA) Role
If a party is receiving public assistance (like CalWORKs), the local child support agency is an interested party in the case. Parties often overlook this, incorrectly check 'No' on item 17, and fail to obtain the required LCSA signature in item 18. This will cause the court to reject the agreement, as the LCSA must review and approve any stipulation that affects its right to reimbursement for public funds.
Inaccurate Parenting Time Percentages
In item 6, the parenting time percentages entered are often estimates that may not be accurate or may not add up to 100%. Since the timeshare percentage is a primary factor in the support calculation, an incorrect value will produce an inaccurate guideline amount. This can lead to disputes and make the agreement vulnerable to being challenged later. Parties should carefully calculate the timeshare based on their custody schedule before completing this section. Using an AI form-filler like Instafill.ai can help by validating that the percentages sum correctly.

Frequently Asked Questions About FL-350

 

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This plan is for your FL-350: 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.
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How does the AI fill out FL-350?
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-350, 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-350 to fill out?
FL-350 has a Form Complexity Index of 59 out of 100, in the moderate tier: 180 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 the purpose of Form FL-350, Stipulation to Establish or Modify Child Support?
This form is used by parents who have reached a mutual agreement to either create a new child support order or change an existing one. It must be filed with the court to become a legally binding order.
Who needs to fill out this form?
Parents who agree on child support terms and already have an open court case, such as a divorce or parentage case, should use this form. Both parents must complete and sign it.
Do I need an existing court case to use this form?
Yes, the instructions clearly state that a court case must already be open before you can file this stipulation with the court.
What happens if the local child support agency (LCSA) is involved in my case?
If the LCSA is part of your case, a lawyer from their office must also review, approve, and sign the agreement in section 18 before it can be filed.
What other documents do I need to submit with Form FL-350?
You must attach the 'Notice of Rights and Responsibilities' form. If the LCSA is not involved, each parent must also complete and file a 'Child Support Case Registry Form'.
What is the difference between 'basic' and 'additional' child support?
Basic child support is the primary monthly amount for the children's care. Additional child support covers other specific costs like uninsured healthcare, childcare, and educational expenses, which can be split by percentage or a fixed dollar amount.
What is the 'guideline child support amount' and do we have to agree to it?
The guideline amount is the standard support amount calculated under California law. While you must state this amount on the form, you can agree to a different amount if you provide a reason and it's in the children's best interest.
What financial information do I need to provide?
You must provide either a computer printout of a child support calculation or manually enter each parent's net monthly disposable income and the percentage of time the children spend with each parent.
What do I do after both parents have signed the form?
After the form is completed and signed by both parents (and the LCSA, if required), it must be filed with the court clerk. A judge will then need to review and sign the stipulation to make it an official court order.
What is an 'earnings assignment order'?
This is an order sent to the paying parent's employer to automatically deduct child support from their wages. Parents can agree to stop the service of this order if they arrange an alternative method for ensuring payment.
Can I use an AI tool to help me fill out this form?
Yes, services like Instafill.ai use AI to auto-fill form fields accurately and save time. This can help ensure all necessary information is entered correctly before you file.
How can I fill out Form FL-350 online?
You can use a service like Instafill.ai to easily complete this form online. Their platform allows you to enter your information once and it will populate all the required fields for you.
The PDF version of this form I found isn't fillable. What can I do?
If you have a non-fillable PDF, services like Instafill.ai can convert it into an interactive, fillable form. This allows you to type your information directly into the fields online instead of printing and writing by hand.
What happens if we agree to a support amount that is different from the guideline?
If you agree to an amount less than the guideline, the order can be modified in the future without showing a change of circumstances. If you agree to an amount above the guideline, a change of circumstances will be required for a future modification.
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