Life changes — and Florida law recognizes that. If your income dropped, your child's needs grew, or your circumstances shifted significantly since your last child support order, you may be able to have that order modified. This guide walks you through how to do it yourself, step by step.
Important: Pro Se Document Preparation is not a law firm and does not provide legal advice. If you need legal representation, contact the Florida Bar Lawyer Referral Service at 1-800-342-8011.
What Is a Child Support Modification?
A child support modification is a legal change to an existing court order that sets the amount one parent pays the other for a child's care. In Florida, the original order stays in effect until a judge approves a new one — which means if your circumstances have changed, you need to go back to court to make the change official. Simply agreeing with the other parent over text or verbally is not legally binding.
The modification process is governed by Florida Statute 61.30 and the Florida Child Support Guidelines.
The Key Requirement: "Substantial Change in Circumstances"
Florida courts don't modify child support just because one parent asks. You must show a substantial change in circumstances — meaning something significant has changed since the original order was entered (or since it was last modified).
The change must be:
- Substantial — not minor or temporary
- Material — it meaningfully affects the child support calculation
- Unanticipated — not something that was foreseeable when the original order was entered
Common Qualifying Changes
These are situations Florida courts regularly recognize as grounds for modification:
- Job loss or reduced income — if you were laid off, had your hours cut, or took a lower-paying job involuntarily
- Significant income increase — if the paying parent's income has risen substantially, the receiving parent can request more
- Relocation — if one parent moves and it changes the time-sharing arrangement, child support may need to be recalculated
- Child's changing needs — a new medical diagnosis, disability, or significant increase in healthcare or educational expenses
- Change in time-sharing — if the parenting plan has changed in practice, even informally, support amounts may need to reflect that
- Child aging out — if support for one of several children terminates because they turned 18, the remaining amount may need recalculation
Note: A voluntary income reduction — like quitting a job or deliberately working fewer hours — generally does not qualify. The court may impute income based on what you're capable of earning.
Florida Child Support Guidelines (FL Statute 61.30)
Florida uses a formula-based approach to calculate child support. The calculation takes into account:
- Both parents' net monthly incomes
- The number of overnight stays the child spends with each parent
- Health insurance costs
- Childcare costs
The Florida Child Support Guidelines Worksheet is used to calculate the correct amount. If your recalculated support differs from the current order by at least 15% or $50 per month (whichever is greater), that difference is considered substantial enough for a modification.
Required Forms for a Florida Child Support Modification
You'll need these Florida Supreme Court-approved forms:
1. Supplemental Petition for Modification of Child Support
This is your primary filing document. You'll explain what has changed and what you're asking the court to do. If the modification involves custody or time-sharing as well, you'll use a combined petition.
2. Financial Affidavit (Form 12.902(b) or 12.902(c))
This is a sworn statement of your current income, expenses, assets, and debts. It's required any time child support is at issue.
- Form 12.902(b) — for parties with gross income under $50,000/year
- Form 12.902(c) — for parties with gross income of $50,000/year or more
Both parties must file updated Financial Affidavits as part of the modification process.
3. Child Support Guidelines Worksheet
This worksheet runs the new numbers using both parents' current incomes and time-sharing schedule. It shows the court what the recalculated support amount should be.
4. Notice of Social Security Number (Form 12.902(j))
Required for any case involving child support.
Step-by-Step: How to File a Child Support Modification in Florida
Step 1: Gather Your Documentation
Before you file, collect documents that support your claimed change in circumstances:
- Recent pay stubs, tax returns, or a termination letter (income change)
- Updated medical or childcare bills (child's needs)
- Court order showing any change in time-sharing (custody change)
Step 2: Complete the Required Forms
Fill out the Supplemental Petition for Modification, your Financial Affidavit, and the Child Support Guidelines Worksheet. Be thorough and accurate — the Financial Affidavit is filed under oath.
Step 3: File at the Correct Courthouse
File where the original order was entered. If your original divorce or paternity case was filed in Hillsborough County, you file the modification in Hillsborough County — even if you've since moved. The clerk will assign your case a hearing date and collect any applicable filing fees (child support modifications typically carry a filing fee; check with your local clerk).
Step 4: Serve the Other Party
After filing, you must formally serve the other parent with a copy of the petition. Florida has specific rules for service of process — typically through a process server or the county sheriff. Once they are served, they have 20 days to respond.
Step 5: Exchange Financial Affidavits
Both parents are required to exchange updated Financial Affidavits within 45 days of the petition being served.
Step 6: Attend the Hearing
A judge will review both parties' financial information, the Child Support Guidelines Worksheet, and any supporting documentation. You'll have the opportunity to explain your situation. The judge will issue a new order.
Agreed Modification vs. Contested Modification
Agreed (Uncontested) Modification
If both parents agree on the new support amount, the process is significantly simpler and faster. You still need to file with the court — verbal or written agreements between parents are not enforceable until a judge signs a new order. But an agreed modification typically doesn't require a full adversarial hearing; the judge may approve it on the paperwork alone.
You'll need:
- A written Agreed Order or Stipulated Agreement
- Both parents' signatures
- The updated Financial Affidavits and Guidelines Worksheet
Contested Modification
If the other parent disagrees — either with your claimed change in circumstances or with the proposed new amount — the case becomes contested. Both parties will present their positions at a hearing and the judge will decide. This takes longer and requires more preparation.
Even in contested cases, many parents reach an agreement before the hearing date.
Common Mistakes to Avoid
- Stopping payments before the new order is signed. Your current obligation stands until a judge signs the new order. Stopping early can result in arrears and contempt proceedings.
- Missing the financial disclosure deadline. Florida requires both parties to exchange Financial Affidavits within 45 days. Missing this can slow your case.
- Filing in the wrong county. Always file where the original order was entered, not where you currently live.
- Using outdated forms. Florida Supreme Court forms are periodically updated. Always use the current version from the Florida Courts website.
Ready to Get Started?
Completing these forms correctly — especially the Financial Affidavit and Guidelines Worksheet — is where most people get stuck. The math has to be right, and the forms must be filled out completely or the clerk may reject them.
Pro Se Document Preparation can prepare your modification documents for you. We handle the paperwork — you file it.
👉 Modify Child Support or Custody Form Kit ($40) — includes the Supplemental Petition, Financial Affidavit, and Child Support Guidelines Worksheet, completed and ready to file.
👉 Financial Affidavit Only — if you just need help with this one form.
Document preparation fees are separate from any court filing fees charged by the clerk's office.