Yes! You can use AI to fill out Florida Supreme Court Approved Family Law Form 12.905(b), Supplemental Petition for Modification of Child Support
Form 12.905(b), the Supplemental Petition for Modification of Child Support, is a formal request filed in a Florida court to alter an existing child support obligation. It is used when there has been a significant, permanent, and unforeseen change in the financial circumstances of either parent, making the current support amount unreasonable or unfair. 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.
Form 12.905(b) is part of the
child supplement forms, family court forms, family law forms, family petition forms and florida court forms categories on Instafill.
Form Complexity Index
Basic
44 / 100
| Fillable fields | 47 |
| Pages | 7 |
| Fields per page | 7 |
| Sections | — |
| Conditional rules | — |
| Tables & lists | — |
| Instruction pages | — |
| Instafill Form ID | IF-FLORIDA-SUPREME-COURT-APPROVED-FAMILY-LAW-FORM-12905B-SUPPLEMENTAL-PETITION-FOR-MODIFICATION-OF-CHILD-SUPPORT |
Form 12.905(b) has a basic Form Complexity Index of 44/100 — 47 fillable fields across 7 pages. Instafill’s AI completes it accurately in under a minute.
Form specifications
| Form name: | Florida Supreme Court Approved Family Law Form 12.905(b), Supplemental Petition for Modification of Child Support |
| Number of fields: | 49 |
| Number of pages: | 1 |
| FCI: | Basic (44/100) |
| Language: | English |
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How to Fill Out Form 12.905(b) Online for Free in 2026
Are you looking to fill out a FORM 12.905(B) form online quickly and accurately? Instafill.ai offers the #1 AI-powered PDF filling software of 2026, allowing you to complete your FORM 12.905(B) form in just 37 seconds or less.
Follow these steps to fill out your FORM 12.905(B) form online using Instafill.ai:
- 1 Navigate to Instafill.ai and upload or select the Supplemental Petition for Modification of Child Support, Form 12.905(b).
- 2 Provide case information, including the court, case number, and the full legal names of the petitioner and respondent.
- 3 Enter details about the existing final judgment or modification order that established the current child support.
- 4 Clearly describe the substantial change in circumstances that has occurred since the last order was entered.
- 5 Specify the requested modification to the child support amount and explain why this change is in the best interests of the child(ren).
- 6 Indicate which required documents, like the Financial Affidavit and Child Support Guidelines Worksheet, are being filed with the petition.
- 7 Review the completed form for accuracy, then download, sign it before a notary or deputy clerk, and file it with the circuit court.
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 Form 12.905(b)
Form 12.905(b) has a Form Complexity Index of 44 out of 100, placing it in the basic 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 Form 12.905(b) specifically, the score reflects 47 fillable fields across 7 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 basic score means the form is relatively light, but still needs careful, accurate entry. Instafill removes that effort entirely: our AI reads your information, maps each value to the correct field — including the conditional ones — and completes Form 12.905(b) 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 to ask a Florida court to change an existing, court-ordered child support amount. To be successful, you must prove that a substantial change in circumstances has occurred since the last order was issued.
You should file this form if you are a parent subject to a Florida child support order and your financial situation, or the other parent's, has changed significantly. This change must be substantial enough to warrant a recalculation of the support obligation.
You must also file a Family Law Financial Affidavit, a Child Support Guidelines Worksheet, and a Notice of Social Security Number if not previously filed. A copy of the original final judgment and any subsequent modifications must also be attached.
A substantial change typically involves a significant, involuntary, and permanent change in a parent's income, a change in the child's needs like health care costs, or a change in the parenting time-sharing schedule.
You must file the petition in the circuit court of the county where the original child support order was entered. If the order was from another state, it is highly recommended to speak with an attorney.
Yes, you are swearing to the truthfulness of the information provided. You must sign the petition in front of a notary public or a deputy clerk before you file it.
You must have the other parent formally served with a copy of the petition by a sheriff's deputy or a certified process server. After being served, the other party has 20 days to file a response.
You can ask the clerk for an Application for Determination of Civil Indigent Status. If you qualify based on your income and assets, the court may waive or defer the filing fees.
If the other parent files an answer disagreeing with your petition, the case is considered 'contested.' You may be required to attend mediation, and if no agreement is reached, you will need to set a final hearing for a judge to decide.
Yes, services like Instafill.ai use AI to help you accurately auto-fill form fields with your information. This can save time and reduce the chance of making errors on important legal documents.
You can use a service like Instafill.ai to fill out the form online. Simply upload the PDF, and the platform will make it an interactive, fillable form that you can type into directly from your computer.
If you have a non-fillable or 'flat' PDF, you can use Instafill.ai to convert it into an interactive, fillable form. This allows you to easily complete the document electronically instead of printing it and filling it out by hand.
Yes, if you need immediate relief, you can file a Motion for Temporary Support (Form 12.947(a)). This asks the court to issue a temporary order for child support that will be in effect while your main petition is being decided.
Compliance Form 12.905(b)
Validation Checks by Instafill.ai
1
Case Number Format and Presence
This check verifies that the 'Case No.' field is not empty and conforms to the standard format used by the Florida court system (e.g., YY-DR-XXXXXX). This is critical for ensuring the petition is filed under the correct existing case, preventing administrative delays or misfiling. A failure would result in the form being rejected by the clerk's office until the correct case number is provided.
2
Petitioner and Respondent Name Completeness
Ensures that the 'Petitioner Name' and 'Respondent Name' fields in the case caption are both filled out. These names define the parties of the legal action and must be present for the document to be legally valid. If either name is missing, the petition cannot be processed as the court would not know who the involved parties are.
3
Petitioner Name Consistency
This validation confirms that the 'Petitioner full legal name' provided in the body of the petition matches the 'Petitioner Name' listed in the case caption at the top of the form. This consistency is important for legal clarity and to confirm the identity of the person swearing to the facts. A mismatch could lead to questions about the petitioner's identity and potential rejection of the filing.
4
Prior Judgment Type Selection
Verifies that one and only one checkbox is selected in Section 1 to indicate the type of final judgment being modified (e.g., dissolution of marriage, paternity). If the 'Other' checkbox is selected, this validation also ensures the corresponding description field is not empty. This information is essential for the court to understand the legal basis of the original order.
5
Valid and Past-Dated Judgment Date
Checks that the date of the final judgment entered in Section 1 is a valid date in a standard format (e.g., MM/DD/YYYY) and that the date is in the past. A future or invalid date would be a logical error, as a modification can only be requested for an order that already exists. This prevents nonsensical data entry and ensures the petition's timeline is accurate.
6
Current Child Support Amount Format
This check ensures that the child support amount entered in Section 2 is a valid, positive numerical or currency value. The system should not accept text or negative numbers. This is crucial for establishing the baseline from which the modification is being requested, and incorrect data would make it impossible for the court to evaluate the change.
7
Exclusive Payment Frequency Selection
Validates that exactly one payment frequency checkbox ('week', 'other week', 'month') is selected in Section 2. Selecting none or more than one would create ambiguity about the current support obligation. This check ensures the petition clearly states the terms of the existing order, which is necessary context for the requested modification.
8
Completeness of Justification for Modification
Ensures that the text fields in Section 3 ('substantial change in circumstances') and Section 4 ('I ask the Court to modify...') are not left blank. These explanations form the core legal argument for the petition. Without this information, the petition lacks a cause of action and would be dismissed for failing to state a basis for the requested relief.
9
Completeness of 'Best Interests' Explanation
Verifies that the explanation field in Section 5, detailing why the modification is in the child(ren)'s best interests, is filled out. The 'best interests of the child' is the legal standard the court must apply, making this justification a mandatory component of the petition. Failure to provide this explanation would result in the petition being legally insufficient.
10
Required Document Status Selection
This check confirms that a status ('is' or 'will be' filed) has been selected for both the 'Family Law Financial Affidavit' (Section 6) and the 'Child Support Guidelines Worksheet' (Section 8). These documents are mandatory and provide the financial data the court needs to make a decision. Missing this selection creates uncertainty and will halt the case's progress.
11
Petitioner Contact Information Completeness
Verifies that the Petitioner's 'Printed Name', 'Address', 'City, State, Zip', and 'Telephone Number' fields are all completed. This contact information is essential for the court and the other party to send official notices and communications. Incomplete information can lead to missed hearings and potential dismissal of the case for failure to prosecute.
12
Valid Telephone Number Format
This validation checks that the 'Telephone Number' field contains a number in a recognizable format (e.g., 10 digits with optional formatting like parentheses or hyphens). An invalid number prevents the court or opposing party from contacting the petitioner. This ensures the contact information provided is functional and usable.
13
Valid Designated E-mail Address Format
If an email address is provided in the 'Designated E-mail Address(es)' field, this check validates that it follows the standard '[email protected]' format. As e-service is a primary method of communication in Florida courts, a valid email is critical for receiving documents. An invalid format would cause service to fail, jeopardizing the petitioner's case.
14
Nonlawyer Preparer Section Completeness
This is a conditional validation. If any field in the 'IF A NONLAWYER HELPED YOU' section is filled out, this check ensures all fields in that section are completed. Florida rules require nonlawyers who assist with forms to provide their full contact information for transparency. Incomplete information would be a violation of this rule and could invalidate the submission.
Common Mistakes in Completing Form 12.905(b)
Section 1 requires that a copy of the final judgment and any previous modifications be attached to the petition. Filers often forget this step, incorrectly assuming the court already has these documents readily accessible. Failure to attach the required judgments will result in the petition being deemed incomplete, causing significant processing delays or even dismissal of the case until the paperwork is provided.
Section 3 requires a clear explanation of the 'substantial change in circumstances.' A common error is providing a vague or legally insufficient reason, such as 'I need more money' or 'Their situation has improved.' The court requires specific, factual changes like a documented job loss, a significant and permanent salary increase for the other party, or a major change in the child's needs. A weak justification can lead to the petition being denied.
The petition includes a sworn statement that must be signed in the physical presence of a Notary Public or Deputy Clerk. A frequent and critical mistake is signing the document at home and then taking the pre-signed form to be notarized, which invalidates the oath. An unnotarized or improperly notarized petition is legally invalid and will be rejected by the court clerk, forcing the filer to start the process over.
The instructions explicitly state that a Financial Affidavit, Child Support Guidelines Worksheet, and other forms must be filed with the petition. Filers often overlook these requirements, believing the petition itself is sufficient. Submitting the petition without these mandatory supporting documents will halt the case, and the court will not proceed until all required forms are received, causing major delays.
In Section 2, filers must specify the exact paragraph number, date, and support amount from the existing court order. People frequently enter incorrect information from memory, which undermines the petition's credibility and forces court staff to search for the correct details, delaying the case. To avoid this, you must have a physical copy of the original judgment in front of you while completing this section.
Section 5 asks why the modification is in the 'best interests of the child(ren).' Many parents mistakenly write about their own financial struggles or desires. The court's primary concern is the child's welfare, so the explanation must directly connect the requested change to a tangible benefit for the child, such as covering new medical costs, maintaining their standard of living, or funding educational needs.
The header of the form requires the correct Judicial Circuit, County, Case Number, and Division. Entering incorrect information, often from memory or by confusing it with another case, can cause the document to be misfiled or rejected by the clerk. This simple data entry error can delay the legal process significantly until it is corrected and refiled.
The instructions specify that the form should be typed or printed legibly in black ink. Submitting a form that is difficult to read or completed in blue ink can lead to its rejection by the clerk's office, as it fails to meet procedural requirements. Since this form is often a non-fillable PDF, using a tool like Instafill.ai can convert it into a fillable version, ensuring the final document is typed, legible, and professional.
In Section 4, where the filer asks the court to modify child support, many people write vague requests like 'increase support' or 'change the amount.' This is insufficient for the court. The request should be specific, such as 'Recalculate the child support obligation based on the parties' current incomes as detailed in the attached Financial Affidavits and Child Support Guidelines Worksheet.' A clear request helps the judge understand exactly what is being sought.
The form uses numerous checkboxes in sections 1, 2, 6, and 8 to specify the type of judgment, payment frequency, and status of other filings. It is a common oversight to skip these checkboxes or check the wrong ones, creating ambiguity that requires clarification from the court and slowing down the process. AI-powered form-filling tools like Instafill.ai can help prevent this by flagging unanswered required fields before submission.
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