Yes! You can use AI to fill out Form FL-350, Stipulation to Establish or Modify Child Support and Order
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.
FL-350 is part of the
California court forms, family court forms and family law forms categories on Instafill.
Form Complexity Index
Moderate
59 / 100
| Fillable fields | 180 |
| Pages | 3 |
| Fields per page | 60 |
| Sections | — |
| Conditional rules | — |
| Tables & lists | — |
| Instruction pages | — |
| Instafill Form ID | IF-FORM-FL-350-STIPULATION-TO-ESTABLISH-OR-MODIFY-CHILD-SUPPORT-AND-ORDER |
FL-350 has a moderate Form Complexity Index of 59/100 — 180 fillable fields across 3 pages. Instafill’s AI completes it accurately in under a minute.
Form specifications
| Form name: | Form FL-350, Stipulation to Establish or Modify Child Support and Order |
| Number of fields: | 180 |
| Number of pages: | 1 |
| FCI: | Moderate (59/100) |
| Language: | English |
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How to Fill Out FL-350 Online for Free in 2026
Are you looking to fill out a FL-350 form online quickly and accurately? Instafill.ai offers the #1 AI-powered PDF filling software of 2026, allowing you to complete your FL-350 form in just 37 seconds or less.
Follow these steps to fill out your FL-350 form online using Instafill.ai:
- 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.
Our AI-powered system ensures each field is filled out correctly, reducing errors and saving you time.
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Frequently Asked Questions About FL-350
FL-350 has a Form Complexity Index of 59 out of 100, placing it in the moderate complexity tier. This score is calculated deterministically from the form’s own structure using Instafill’s published Form Complexity Index methodology, so it can be reproduced and independently verified — it is not a subjective estimate.
For FL-350 specifically, the score reflects 180 fillable fields across 3 pages. The number of fields is the largest factor in the base score (weighted 36%), followed by how difficult those fields are to complete based on their type, where free-text and signature fields count for more than simple checkboxes (26%). The number of pages that actually contain fields (15%), the amount of conditional “fill-only-if” logic (16%), and how many sections the form is divided into (7%) account for the rest of the base. On top of that base, the index adds points for tables and repeating lists, bundled instruction pages, and dense page layouts — capturing difficulty the base alone can miss.
In practical terms, a moderate score means the form takes real effort: there are enough fields, pages and rules that errors are easy to make by hand. Instafill removes that effort entirely: our AI reads your information, maps each value to the correct field — including the conditional ones — and completes FL-350 accurately in under a minute, with every field available for you to review before you download. See exactly how the Form Complexity Index is calculated.
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.
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.
Yes, the instructions clearly state that a court case must already be open before you can file this stipulation with the court.
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.
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'.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Compliance FL-350
Validation Checks by Instafill.ai
1
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.
2
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.
3
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.
4
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.
5
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.
6
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.
7
Guideline Agreement Exclusivity
This check confirms that in the 'GUIDELINE SUPPORT AMOUNT' section, only one of the two options, item 9 ('We agree to guideline child support') or item 10 ('We do not agree...'), is selected. These options are mutually exclusive. This validation ensures the parties' intention regarding the guideline amount is clear and unambiguous for the court.
8
Non-Guideline Agreement Justification
If the parties check item 10, indicating they do not agree to the guideline support amount, this validation ensures that they have provided the required justifications. It checks that both the alternative support amount in 10a and a specific reason in 10b are filled out. This is a legal requirement to deviate from the state guideline.
9
Conditional LCSA Approval Signature
This validation is triggered by the response to item 17. If the 'Yes' box is checked, indicating that a parent is receiving public assistance, the check confirms that the 'Local child support agency' signature block (item 18) is completed. The form explicitly states this is required, and failure to obtain this signature would invalidate the agreement in such cases.
10
Additional Support Payment Method Logic
For each type of additional support in the table in Section 2b (e.g., 'Childcare costs'), this check ensures that the parties have chosen either a percentage split OR a fixed dollar amount, but not both. It also confirms that if a percentage or dollar amount is entered, the corresponding checkbox for that row is selected. This prevents contradictory or confusing payment arrangements.
11
Additional Support Percentage Sum
For any additional support item in Section 2b where the parties choose a percentage split, this check verifies that the percentages assigned to each parent sum to 100%. This ensures the full cost of the expense is accounted for in the agreement. An incorrect sum would create an ambiguous and unenforceable obligation.
12
Party Signature and Role Verification
Confirms that both parties have provided a signature, printed name, and date on page 3. It also cross-references the role selected next to each signature (Petitioner, Respondent, etc.) with the role declared for that party in Section 1. This is a fundamental check to ensure the agreement is properly executed by the correct individuals in their correct legal capacities.
13
Child Support Start Date Format and Logic
Validates that the child support start date entered in Section 2 is a valid, future or present date in a proper MM/DD/YYYY format. It should prevent the entry of dates that are in the past, which could create confusion about arrears. This ensures clarity on when the new support obligation officially begins.
14
Total Monthly Support Calculation
This check verifies that the 'Total monthly child support' amount in Section 2c is the correct sum of the 'Basic child support' from 2a and any fixed dollar amounts specified for additional support in the table in 2b. This automated calculation prevents arithmetic errors and ensures the final ordered amount accurately reflects the components of the agreement. An incorrect total could lead to over or underpayment.
Common Mistakes in Completing FL-350
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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