In Florida, both parents share a legal duty to support their children financially. Child support is not optional, and parents cannot negotiate it away — the court must always review the numbers. The amount is set by Florida Statutes §61.30 using the Income Shares Model, which estimates what the family would have spent on the child if the parents had remained together, then divides that obligation in proportion to each parent's income.
How Florida Child Support Is Calculated
The guideline calculation follows a specific sequence. Small changes in any input can produce meaningful changes in support:
- Gross monthly income— wages, self-employment, bonuses, commissions, rental income, interest and dividends, unemployment, and recurring gifts.
- Allowable deductions— federal, state, and local taxes, FICA, mandatory union dues, mandatory retirement, health insurance for the parent (not the children), court-ordered support for other children, and alimony paid.
- Net monthly income = gross minus allowable deductions.
- Combined net monthly income— both parents' net income added together.
- Each parent's percentage share = their net income divided by combined net.
- Minimum need— the combined net income and number of children are looked up in the statutory schedule (§61.30(6)).
- Child-care and health-insurance costs for the children are added to the base obligation and shared by the same percentages.
- Gross-up for substantial time-sharing— if each parent has at least 20% (73+) overnights per year, the obligation is multiplied by 1.5 and credited for each parent's time with the child.
Try our free Florida Child Support Calculator — it asks for gross income (the way the court program does) and applies the gross-up formula automatically. For a line-by-line walkthrough, see Explanation of a Florida Child Support Guidelines Worksheet.
Imputed Income
A parent cannot dodge child support by being “voluntarily unemployed” or underemployed. If a judge believes a parent is earning less than they reasonably could, Florida law allows the court to impute income based on recent work history, occupational qualifications, and prevailing earnings in the community.
Deviation From the Guidelines
Judges can deviate from the guideline amount by up to 5% without written findings. Deviations greater than 5% require written findings showing that the guideline would be unjust or inappropriate. Common grounds for deviation include extraordinary medical expenses, special educational needs, a child's independent income, or specific time-sharing arrangements.
Modifying a Child Support Order
Child support can be modified when a substantial change in circumstances would produce a guideline amount at least 15% or $50 different (whichever is greater) from the current order. Common triggers:
- Significant change in either parent's income
- Job loss or disability
- Change in overnight time-sharing
- Child reaching majority or emancipation
- New child-related expenses (medical, educational)
Modifications apply from the date the petition is filed, not from when the change occurred — so file promptly. Learn more about modifications.
Enforcing Unpaid Child Support
Florida offers several enforcement mechanisms if the other parent falls behind:
- Income Deduction Order (IDO)— direct withholding from the payor's paycheck.
- Contempt of court— fines, makeup payment plans, driver's license suspension, and in egregious cases, jail.
- Interception of tax refunds and lottery winnings
- Judgments and liens against property
- Passport denial for arrears exceeding statutory thresholds
I can file an enforcement motion or defend against one. See Contempt & Enforcement.
How Alimony Affects Child Support
Alimony received is treated as gross income to the recipient and reduces the payor's gross income for support purposes. This interaction — plus the effect of overnights — is why alimony and child support should always be negotiated together, not sequentially. See Alimony.
When Does Child Support End?
In Florida, child support typically continues until the child turns 18. If the child is still in high school, expected to graduate before age 19, and performing as expected, support can continue until graduation. Support may also continue indefinitely for a child with a physical or mental disability that prevents self-support, if the disability manifested before age 18.
How I Can Help
Whether you need an initial calculation, a formal Guidelines Worksheet for court or mediation, a modification of an existing order, or help enforcing unpaid support, I can help. Call 904-858-4334 or contact me online.