Child Support in St. Martin Parish, Louisiana: How Much Will You Owe?

Quick answer: it depends on both parents' incomes, how many children you have, and the parenting schedule. The calculator on this page turns those numbers into a real guideline estimate in about a minute. It is an educational estimate, not legal advice, and the judge always sets the final amount. FamilyCourtHelp.com is a self-help resource, not a law firm.

If you are facing a child support case in St. Martin Parish, Louisiana, the first question is almost always the same: how much? The honest answer is that it depends on income, children, and parenting time, all run through Louisiana's statewide formula. Below you can see how that formula works and try it with your own numbers.

Louisiana follows the Income Shares model under La. R.S. 9:315 et seq.. The court combines both parents' monthly gross incomes, looks up the basic support obligation on the state's guideline schedule for that income level and number of children, then prorates the obligation between the parents according to each parent's percentage share of the combined income.

What counts as income? Louisiana runs the formula on gross income, meaning income before taxes come out. Gross income from any source, salaries, wages, commissions, bonuses, dividends, severance, pensions, interest, trust income, Social Security, workers' compensation, unemployment, and recurring gifts. Self-employment income is net of business expenses.

Parenting time matters directly in Louisiana: the number of overnights each parent has changes the math itself. Louisiana uses a shared-care formula for parenting time. When each parent has the child for at least 146 overnights per year, the case qualifies as shared custody and the court uses a separate shared-custody worksheet instead of the standard one. That shared worksheet can change the support number because it accounts for both households carrying real costs for the child. Below that overnight level, the standard Income Shares worksheet under La. R.S. 9:315 et seq. applies and parenting time alone does not automatically reduce the obligation.

When does it end? Louisiana child support generally ends at age 18 or upon graduation from high school, whichever is later, but not past age 19. Continuing support is available for an adult child with a disability that began before majority.

Can the amount change later? File a rule to modify in district court or request review through Louisiana Child Support Enforcement (DCFS). The general standard under La. R.S. 9:311(A) is a material change in circumstances that is substantial and continuing. The 25% presumption in 9:311(C)(1) is limited to cases where DCFS provides enforcement services, does not apply where the existing award reflects a deviation, and the court retains discretion under 9:311(C)(2). Periodic three-year reviews under 9:311(C)(3) are a separate agency track.

If payments fall behind, Louisiana has real enforcement tools. Louisiana DCFS enforces through automatic income withholding, tax intercept, license suspension, credit reporting, and contempt referrals. The state actively uses license suspension on professional and recreational categories.

Child support cases arising in St. Martin Parish are generally handled through Louisiana's District Court, and Louisiana Department of Children and Family Services, Child Support Enforcement Section runs the state's child support services program. Offices, forms, and local practice can vary from parish to parish, so confirm the current details with your local court or the agency. This page stays general on purpose and does not give St. Martin parish filing steps.

Family cases from St. Martin Parish go through the St. Martin Parish Clerk of Court (16th JDC). These court details were checked in June 2026.

The calculator on this page is the same live engine behind our full Child Support Calculator. Enter both incomes, the number of children, and the overnight split, and the estimate updates instantly. The full calculator page adds extras like health insurance, child care costs, and saved scenarios.

Bottom line for St. Martin Parish, Louisiana: the guideline number comes from incomes, children, and parenting time. Run the estimate on this page, keep your paperwork honest and complete, and let the court confirm the final amount.

Frequently asked questions

How much child support will I owe in St. Martin Parish, Louisiana?

There is no flat amount. Louisiana uses the Income Shares model under La. R.S. 9:315 et seq., so the number depends on both parents' incomes, the number of children, and the parenting schedule. The calculator on this page gives you a guideline estimate in about a minute, and the court sets the final amount.

Does parenting time change child support in Louisiana?

Parenting time matters directly in Louisiana: the number of overnights each parent has changes the math itself. Keep a clear record of your actual schedule, because the overnight count is one of the main inputs.

When does child support end in Louisiana?

Age 18, or until graduation from high school not past age 19, whichever is later.

Can the child support amount be changed later in Louisiana?

Usually yes, when circumstances change enough. La. R.S. 9:311(A): a material change in circumstances that is substantial and continuing. The 25% presumption in 9:311(C)(1) applies ONLY when DCFS is providing child support enforcement services, is subject to the deviation exception, and 9:311(C)(2) leaves the court discretion. The three-year periodic reviews in 9:311(C)(3) are a separate agency process.

Who handles child support cases in St. Martin Parish?

Cases are generally heard in Louisiana's District Court, and Louisiana Department of Children and Family Services, Child Support Enforcement Section handles services like locating parents, establishing orders, and collecting payments. Confirm the right office with your local St. Martin parish court.

Is the calculator on this page the official Louisiana calculator?

No. It is a free educational estimate built on Louisiana's guideline model. Louisiana Department of Children and Family Services, Child Support Enforcement Section publishes the official rules and worksheets, and the judge always sets the final amount. Most parents use the estimate to budget, sanity-check a proposal, or decide whether to ask for a change.

Which court handles child support cases in St. Martin Parish?

The St. Martin Parish Clerk of Court (16th JDC). Confirm the current forms, fees, and hours with the clerk before you file. This is general information, not legal advice.