Louisiana Child Support Guidelines: How Support Is Calculated

In Louisiana, child support is calculated using the "income shares model": the court combines both parents' gross monthly incomes, finds the basic support amount on the state's child support schedule for that combined income and the number of children, and then splits that amount between the parents in proportion to what each parent earns. Custody arrangements, health insurance, child care costs, and certain other expenses can adjust the final number up or down. Here is how the calculation actually works, what can change it, and what to do next if you are dealing with a Louisiana child support case.

The basic idea: income shares

Louisiana law states the underlying premise plainly: child support is a continuous obligation of both parents, children are entitled to share in the current income of both parents, and children should not be the economic victims of divorce or a birth outside marriage. The guidelines adopt what is called the Income Shares Model, which tries to estimate the percentage of parental income that would have gone to the children if the parents lived together in one household, and then splits that amount between the two parents based on each parent's share of their combined income (La. R.S. 9:315).

In practice, that means the calculation is not just "what does the paying parent make." Both parents' incomes go into the formula, and both parents are expected to contribute to the total support obligation in proportion to what they earn.

What counts as income

Louisiana's guidelines define gross income broadly. It generally includes wages, self-employment income, bonuses, interest, and pension income, among other sources. It specifically excludes child support the parent already receives for other children and means-tested public assistance benefits (La. R.S. 9:315(C)(3)). If your income situation is unusual — for example, you are self-employed, seasonal, or have irregular bonus income — how that income is characterized can meaningfully change the calculation, so this is a good area to raise with the court or a Louisiana family law attorney.

The schedule, and what happens at higher incomes

Louisiana publishes a Child Support Schedule that sets the basic support obligation for combined adjusted monthly gross income levels. That schedule covers combined incomes up to $40,000 per month. Above that combined monthly income level, the schedule does not apply automatically, and the support obligation is set case by case rather than by a fixed table amount (La. R.S. 9:315.19; La. R.S. 9:315.13).

Time-sensitive: dollar thresholds and schedule amounts in support statutes are periodically updated by the legislature. Confirm the current combined-income cutoff and the current schedule amounts with the Louisiana Department of Children and Family Services (DCFS) Child Support Enforcement program or a Louisiana court before relying on a specific number.

How custody time changes the number

Custody arrangements affect the calculation in two different ways depending on the custody structure:

• Standard joint custody with a domiciliary parent: If the parent who would otherwise pay support actually has physical custody of the child for more than 73 days, the court may order a credit against that parent's support obligation. For this purpose, a "day" means at least four hours of physical custody (La. R.S. 9:315.8(E)).
• Shared (roughly equal) custody: When parents share physical custody approximately equally, the calculation works differently. The basic child support obligation is multiplied by 1.5, then divided between the parents in proportion to their incomes, and then cross-multiplied by the percentage of time each parent spends with the child. The resulting payment cannot exceed what the domiciliary parent's obligation would otherwise be under a standard calculation (La. R.S. 9:315.9).

Because these formulas depend on exact custody-day counts and cross-multiplication, small differences in a parenting schedule (for example, whether an overnight or a few extra weekend hours push someone over 73 days, or whether custody counts as truly "shared") can change the outcome. It is worth having your actual calendar/time records ready before a hearing.

Health insurance and other add-on costs

The total child support obligation is not just the basic schedule amount. Louisiana law adds the cost of the child's health insurance premiums, net child care costs, extraordinary medical expenses, and other extraordinary expenses to the basic obligation to reach the total obligation. Any income the child has is then deducted, and what remains is the total obligation. Each parent's share of that total is based on their percentage share of the parents' combined income (La. R.S. 9:315.8).

Modifying an existing order

A Louisiana child support order is not locked in forever, but it also cannot be changed just because one parent wants a different amount. The law requires a "material change in circumstances" that is substantial and continuing. Louisiana law also creates a rebuttable presumption that a material change has occurred when strictly applying the guidelines to current circumstances would change the award by 25 percent or more (La. R.S. 9:311).

Time-sensitive: that 25 percent threshold is a statutory figure and could be amended by the legislature; confirm it is still current before relying on it in a filing.

One important federal rule applies no matter which state issued the order: once child support has accrued (become due and unpaid), it generally cannot be reduced or forgiven retroactively. Modifications can only change support going forward from the date a modification is filed or granted, not erase past-due amounts. This comes from federal law governing state child support programs, not from a Louisiana-specific statute, so it applies in every state, including Louisiana.

Enforcement, and what happens across state lines

Louisiana's DCFS Child Support Enforcement program is the state's Title IV-D agency. For applicants who are not receiving public assistance, there is a $25 application fee. Services include locating the other parent, establishing paternity (with free genetic testing when paternity is disputed), and enforcing existing orders (Louisiana DCFS Child Support Enforcement, Title IV-D program).

Time-sensitive: confirm the current application fee and process directly with DCFS, since fee amounts can change.

Federal law requires every state's child-support program to use standardized enforcement tools, including income withholding, license suspension, and liens, and it allows even federal wages and benefits to be garnished for support obligations. If a Louisiana order needs to be enforced against a parent who has moved to another state, or vice versa, federal law generally requires other states to enforce (rather than re-decide) a validly issued order, with only narrow exceptions for which state has continuing authority to modify it. This works together with Louisiana's version of the Uniform Interstate Family Support Act.

Support obligations also get special treatment in bankruptcy. Child support (and alimony) generally cannot be discharged in bankruptcy and is paid ahead of most other unsecured debts. Property-settlement debts owed to a former spouse under a divorce decree are also generally not dischargeable in a standard Chapter 7 bankruptcy. If the other parent has filed or is threatening to file bankruptcy, this is worth knowing, but confirm specifics with a bankruptcy or family law attorney.

What you can do in Louisiana

1. Gather income documentation for both parents — pay stubs, tax returns, self-employment records — since the calculation depends on combined income, not just one parent's earnings.
2. Track custody time carefully. If you have or are seeking joint or shared custody, keep a record of actual overnights and hours, since the credit and shared-custody formulas turn on specific day and time counts.
3. List add-on costs. Document health insurance premiums for the child, child care costs, and any extraordinary medical or other expenses, since these are added to the basic obligation.
4. Contact Louisiana DCFS Child Support Enforcement if you need help establishing paternity, locating the other parent, or enforcing an existing order, and confirm the current application fee before applying.
5. If your circumstances have changed significantly (income, custody, or needs of the child), ask a Louisiana court or an attorney whether the change meets the "material change" and 25 percent threshold before filing for modification — and remember that modifications generally only affect support going forward, not amounts already owed.
6. If another state is involved (a parent moved, or the order was issued elsewhere), confirm which state currently has continuing authority over the order before trying to modify it in Louisiana.

This article is for general information only and is not legal advice; consult a Louisiana family law attorney or your local court for guidance on your specific situation.