Yes, you can still owe child support with 50/50 custody in Louisiana. Under La. R.S. § 9:315.9, shared custody multiplies the basic obligation by 1.5, divides it by income share, then cross-multiplies by parenting time. The higher earner pays the difference, even with equal time.
Many parents assume that equal parenting time eliminates child support entirely. In Louisiana, that assumption is wrong. The state uses an Income Shares Model under La. R.S. § 9:315 that ties each parent's obligation to income, not just to overnights. When one parent earns more, that parent typically pays support regardless of a perfectly even custody split. This guide explains exactly how child support 50 50 custody Louisiana calculations work, which statute governs your case, and what the numbers actually look like.
Key Facts: Louisiana Child Support and 50/50 Custody
| Factor | Louisiana Rule (2026) |
|---|---|
| Filing Fee | $150-$410 by parish (Orleans ~$332.50, St. Tammany ~$410). As of March 2026. Verify with your local clerk. |
| Waiting Period | 180 days (no minor children) or 365 days (with minor children) of living separate under La. C.C. Art. 102/103 |
| Residency Requirement | Domicile in Louisiana; rebuttable 6-month presumption under La. C.C.P. Art. 10 |
| Grounds | No-fault (living separate and apart) plus fault grounds (adultery, felony conviction) |
| Property Division Type | Community property (equal division of marital assets) |
| Child Support Model | Income Shares Model under La. R.S. § 9:315 |
| Shared Custody Statute | La. R.S. § 9:315.9, Worksheet B |
Do You Still Pay Child Support With 50/50 Custody in Louisiana?
Yes, you can still pay child support with 50/50 custody in Louisiana. The state uses an Income Shares Model under La. R.S. § 9:315, so the higher-earning parent typically owes support even when both parents have the children for approximately equal time. Equal custody reduces, but does not erase, the obligation.
The reason is that Louisiana child support is built on income, not just on overnights. The Income Shares Model assumes children should receive the same proportion of parental income they would have received if the parents lived together. When one parent earns $7,000 per month and the other earns $3,000 per month, the higher earner contributes 70 percent of the combined income. Even with a perfect 50/50 parenting schedule, the law expects that income disparity to follow the child between both homes. The question is never whether equal custody child support exists in Louisiana, but how much the higher earner pays after the shared custody formula is applied.
What Statute Governs 50/50 Shared Custody Child Support?
The controlling statute is La. R.S. § 9:315.9, titled "Effect of shared custodial arrangement." It applies when each parent has physical custody for an approximately equal amount of time. This statute requires Worksheet B and multiplies the basic child support obligation by 1.5 to account for two households before dividing it by income.
Under La. R.S. § 9:315.9, "shared custody" means that each parent has physical custody of the child for an approximately equal amount of time. This is the legal trigger for the shared custody formula. A court applies this statute either when a joint custody order or implementation plan provides for shared custody, or when the court finds by a preponderance of the evidence that shared custody actually exists in practice. The statute was last substantively amended by Acts 2016, No. 432, § 1, building on earlier changes from Acts 2012, No. 255, § 2. Because Louisiana is a civil law state, courts apply this codified statute directly rather than relying primarily on case precedent, which makes the shared custody child support calculation more formula-driven than in common law states.
How the Louisiana Shared Custody Formula Works (5 Steps)
The Louisiana shared custody formula under La. R.S. § 9:315.9 runs in five steps: multiply the basic obligation by 1.5, divide by income share, cross-multiply by the other parent's time percentage, add child care and medical costs, then have the higher-owing parent pay the difference. Worksheet B from La. R.S. § 9:315.20 is mandatory.
Here is the sequence courts follow for a true 50/50 parenting time support case:
- Apply the 1.5 multiplier. The court finds the basic child support obligation from the schedule in La. R.S. § 9:315.19, then multiplies it by 1.5 to cover the added cost of two homes.
- Divide by income proportion. The multiplied obligation is divided between parents in proportion to their respective adjusted gross incomes.
- Cross-multiply by time. Each parent's theoretical obligation is cross-multiplied by the actual percentage of time the child spends with the OTHER parent.
- Add additional costs. Each parent adds a proportionate share of work-related net child care, extraordinary expenses, and uninsured ordinary medical expenses under $250 as defined in La. R.S. § 9:315.
- Pay the difference. The parent owing the greater amount pays the other parent the difference. By statute, this amount can never exceed what that parent would owe as a domiciliary parent.
How Much Is Child Support With 50/50 Custody? A Worked Example
With 50/50 custody in Louisiana, the higher earner still pays support, but the amount is reduced by the cross-multiplication step. For two children and $10,000 combined monthly income split 70/30, the basic obligation of roughly $1,500 is multiplied by 1.5 to $2,250, then divided and cross-multiplied, often leaving the higher earner owing several hundred dollars monthly.
Consider parents with two children, where Parent A earns $7,000 per month (70 percent) and Parent B earns $3,000 per month (30 percent), in a true 50/50 schedule. The basic obligation from the La. R.S. § 9:315.19 schedule is approximately $1,500 for that combined income. Multiplied by 1.5, the shared obligation becomes $2,250. Parent A's theoretical share is 70 percent, or $1,575; Parent B's is 30 percent, or $675. Each is cross-multiplied by the other parent's 50 percent time, producing roughly $787 for Parent A and $337 for Parent B. Parent A, owing more, pays Parent B the difference of about $450 per month before adding child care and medical costs. These figures illustrate the method; your actual numbers depend on income, the schedule amount, and additional expenses certified to the court.
Shared Custody vs. Joint Custody: The 73-Day Credit Difference
Louisiana law distinguishes shared custody from joint custody, and the difference changes the math. Shared custody under La. R.S. § 9:315.9 uses Worksheet B and the 1.5 multiplier for approximately equal time. Joint custody with a domiciliary parent uses Worksheet A, where a discretionary 73-day credit may reduce support under La. R.S. § 9:315.8.
This distinction is the most commonly misunderstood point in Louisiana child support law. The 73-day credit applies only to joint custody, not shared custody. Under La. R.S. § 9:315.8, if the parent ordered to pay support has physical custody for more than 73 days, the court MAY order a credit. A "day" is determined by the court but can never be less than four hours of physical custody. This credit is discretionary, not automatic, and the parent seeking it bears the burden of proof. A true 50/50 arrangement is not eligible for the 73-day credit because it is governed by the shared custody statute instead. Choosing the wrong worksheet produces an incorrect support amount.
| Feature | Joint Custody (Worksheet A) | Shared Custody (Worksheet B) |
|---|---|---|
| Governing Statute | La. R.S. § 9:315.8 | La. R.S. § 9:315.9 |
| Time Standard | One domiciliary parent; other has 73+ days | Approximately equal time (50/50) |
| Multiplier | None | 1.5x basic obligation |
| Time Credit | Discretionary 73-day credit | Cross-multiplication built into formula |
| Worksheet | Worksheet A | Worksheet B |
What Counts as Income in a Louisiana Child Support Calculation?
Louisiana defines income broadly for child support but uses "adjusted gross income," which is not the same as IRS adjusted gross income. Under La. R.S. § 9:315, gross income includes wages, salary, commissions, bonuses, self-employment income, pensions, and certain benefits, minus allowable deductions such as preexisting support obligations.
Getting income right is critical because the entire shared custody formula divides the obligation by income proportion. Louisiana's adjusted gross income starts with gross income from nearly all sources, then subtracts specific items the statute allows, including preexisting child support and spousal support paid under a court order. For self-employed parents, gross income means gross receipts minus ordinary and necessary business expenses, though the statute disallows certain accelerated depreciation and excessive promotional expenses. Courts can also impute income to a parent who is voluntarily unemployed or underemployed, using earning potential rather than actual earnings. Because adjusted gross income drives both the schedule lookup and the proportional split, parents in shared custody child support disputes often litigate income figures more heavily than the parenting schedule itself.
When Can a 50/50 Child Support Order Be Modified?
A Louisiana 50/50 child support order can be modified when there is a material change in circumstances since the last order. Common triggers include a substantial income change, a shift in the parenting schedule away from approximately equal time, a change in child care or medical costs, or a child reaching the age of majority, generally 18 under Louisiana law.
Modification matters in shared custody cases because the formula is sensitive to both income and time. If one parent's income rises significantly, the proportional split shifts and the support difference recalculates. Likewise, if the schedule drifts from a genuine 50/50 split to something closer to a domiciliary arrangement, the case may move from Worksheet B back to Worksheet A, changing whether the 1.5 multiplier or the 73-day credit applies. Louisiana courts require the requesting parent to prove the material change; the existing order remains enforceable until a judge signs a new one. Parents should not informally agree to stop or reduce payments, because unpaid court-ordered support continues to accrue and can be enforced through the Louisiana Department of Children and Family Services.
How Do You File for Child Support in Louisiana?
You file for child support in Louisiana either through the district court as part of a divorce or custody case, or through the Department of Children and Family Services (DCFS) Child Support Enforcement program. Court filing fees range from approximately $150 to $410 by parish as of March 2026; DCFS services are low-cost or free for qualifying applicants.
Most parents address child support inside an existing divorce or custody proceeding in the district court of the parish where a parent is domiciled. You can establish domicile under La. C.C.P. Art. 10, which creates a rebuttable presumption of domicile after six months of maintained residence in a parish. The court completes Worksheet B for shared custody, attaches it to the support judgment, and the order becomes enforceable. Alternatively, the DCFS Child Support Enforcement program can establish, modify, and enforce orders, including wage garnishment and license suspension for nonpayment. If you cannot afford court costs, you may request a fee waiver by filing to proceed in forma pauperis under La. C.C.P. Art. 5181; households earning below 125 percent of federal poverty guidelines typically qualify. Always confirm current filing fees with your parish clerk of court before filing.