Louisiana uses an income shares model based on combined adjusted gross income. A basic support obligation is determined from published guidelines. Each parent pays a pro rata share.
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Louisiana calculates child support using the Income shares model on combined adjusted gross income established under La. R.S. 9:315 et seq.. This is a statutory formula that leaves limited room for judicial discretion on the base calculation amount, ensuring consistency and predictability for families across the state.
Basic obligation from Louisiana guidelines schedule. Each parent's share = pro rata based on income percentage.
The calculation begins with determining each parent's net disposable income, which includes virtually all sources of income minus taxes, mandatory payroll deductions, and certain hardship deductions. The court then applies the statutory formula using the time each parent has primary physical responsibility for the children and the applicable income allocation brackets.
Beyond the base formula amount, Louisianarequires additional contributions for mandatory add-on expenses. These typically include childcare costs necessary for the custodial parent's employment or education, uninsured healthcare expenses for the children, and in some cases, educational and travel costs. These add-ons are split between parents in proportion to their respective incomes.
Primary statute: La. R.S. 9:315 et seq.
Income shares model using combined adjusted gross income.
Published guidelines schedule.
Health insurance and childcare costs added as adjustments.
Shared custody provisions for substantial parenting time.
Louisiana uses Civil Code (not common law) as the framework for family law.
Community property is divided by operation of law — mandatory 50/50.
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Residency Requirement
Domicile in Louisiana required (residency follows domicile)
Mandatory Waiting Period
180 days (no minor children) or 365 days (with minor children) of living separate and apart
No-Fault Ground
Living separate and apart for required period (La. Civ. Code art. 103)
State Income Tax
Progressive 1.85–4.25% (2025 reform)
Louisiana uses the Income shares model on combined adjusted gross income under La. R.S. 9:315 et seq.. Louisiana uses an income shares model based on combined adjusted gross income. A basic support obligation is determined from published guidelines. Each parent pays a pro rata share.
Key factors include both parents' income, the number of children, custodial time share, mandatory add-on expenses (childcare, health insurance), and any applicable deductions. Income shares model using combined adjusted gross income.
Yes. Either parent can request a modification if there has been a material change in circumstances, such as a significant change in income, custody arrangements, or the needs of the child. The court will recalculate support using the same statutory formula.
Basic obligation from Louisiana guidelines schedule. Each parent's share = pro rata based on income percentage.
Get a personalized child support calculation based on Louisiana's actual statutory formula.
Start My Free LouisianaEstimate →This tool provides educational estimates based on Louisiana family law and does not constitute legal advice. Child support calculations are approximations of the statutory formula and may differ from court-ordered amounts. Consult a licensed Louisiana family law attorney before making decisions. Primary statute: La. R.S. 9:315 et seq..