Louisiana Revised Statutes Tit. 9, § 315.9. Effect of shared custodial arrangement

A. (1) “Shared custody” means that each parent has physical custody of the child for an approximately equal amount of time.

(2) If there is a joint custody order or joint plan for implementation providing for shared custody, or if the court finds by a preponderance of the evidence that shared custody exists, the basic child support obligation shall first be multiplied by one and one-half and then divided between the parents in proportion to their respective adjusted gross incomes.

(3) Each parent's theoretical child support obligation shall then be cross multiplied by the actual percentage of time the child spends with the other party to determine the basic child support obligation based on the amount of time spent with the other party.

(4) Each parent's proportionate share of work-related net child care costs and extraordinary adjustments to the schedule shall be added to the amount calculated under Paragraph (3) of this Subsection.

(5) Each parent's proportionate share of any direct payments ordered to be made on behalf of the child for net child care costs, the cost of health insurance premiums, extraordinary medical expenses, or other extraordinary expenses shall be deducted from the amount calculated under Paragraph (3) of this Subsection.

(6) The court shall order each parent to pay his proportionate share of all reasonable and necessary uninsured ordinary medical expenses as defined in R.S. 9:315(C)(8) which are under two hundred fifty dollars.

(7) The parent owing the greater amount of child support shall owe to the other parent the difference between the two amounts as a child support obligation. The amount owed shall not be higher than the amount which that parent would have owed if he or she were a domiciliary parent.