Quick answer: In Louisiana, an award can be modified only on a material change in circumstances that is substantial and continuing since the last award. In cases where the Department of Children and Family Services provides services, a 25% change is a rebuttable presumption. A modification is retroactive to the date of judicial demand, except for good cause.
This Louisiana child support modification calculator applies La. R.S. 9:311. Enter your current award and the amount the guidelines give today (you can get it from the Louisiana child support calculator), say whether DCFS is providing services, and it shows whether the 25% presumption applies, the monthly gap and what it adds up to from the date of judicial demand. Support before that date cannot change.
Louisiana child support modification at a glance
| Rule | What Louisiana says |
|---|---|
| Standard | A material change in circumstances of one of the parties since the previous award, substantial and continuing (La. R.S. 9:311(A)(1)) |
| 25% presumption | Only where DCFS is providing support enforcement services: a rebuttable presumption at 25% or more (9:311(C)(1)) |
| Court discretion | May modify without a 25% variation if a substantial and continuing change is proven, and may deny even at 25% if the guidelines would not be in the child’s best interest or would be inequitable (9:311(C)(2)) |
| Not needed | A material change need not be shown to add court-ordered medical support or to suspend or modify under the incarceration law (9:311(D)) |
| Start date | Retroactive to the date of judicial demand, except for good cause shown, never earlier (9:315.21(C)) |
| Past-due judgment | A judgment for past due support is not itself a material change that reduces the award (9:311(B)) |
How does child support modification work in Louisiana?
- Know the standard. See what counts as a material change in Louisiana.
- File on time. See how to modify child support in Louisiana.
- Income problems and incarceration. See lowering child support after job loss or incarceration in Louisiana and, for what stays owed from before, the Louisiana child support arrears calculator.
What does this modification calculator check?
The calculator applies the 25% line (exactly 25% counts) only when you say DCFS is providing services, because the statute limits the presumption to those cases. It shows the monthly gap and the accrued difference from the date of judicial demand. It cannot decide whether a court will find the change substantial and continuing, or whether it will deny a modification as inequitable.
Frequently asked questions
What do I have to show to modify child support in Louisiana?
A material change in circumstances of one of the parties since the previous award, substantial and continuing.
Is there a 25% rule for Louisiana child support modification?
Only where DCFS is providing support enforcement services: a 25% change under the guidelines is a rebuttable presumption of a material change. Otherwise you must prove the change.
From what date can Louisiana child support change?
Except for good cause, a modification is retroactive to the date of judicial demand, but never before it.
Does a Louisiana judgment for past-due support justify lowering the award?
No. A judgment for past due support is not itself a material change in circumstances sufficient to reduce an award.
Can I be charged costs for a failed Louisiana modification?
If the court finds no good cause or the motion is dismissed before hearing, it may order the mover to pay costs and reasonable attorney fees if it finds the motion frivolous.
Official sources
- La. R.S. 9:311: modification or suspension of support
- La. R.S. 9:315.21: retroactivity of child support judgment
- La. R.S. 9:311.1: support during the obligor’s incarceration
- La. R.S. 9:315.11: voluntarily unemployed or underemployed party
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due