05/20/2026
Big changes in CHILD CUSTODY cases beginning July 1, 2026 in the State of Mississippi
1. The 50/50 Child Custody Default: What Changed in Mississippi?
In the past, Mississippi courts didn't start with any specific preference for who got custody. The judge had to weigh a long list of factors to decide what was best.
Now, the law has shifted. The new starting point is a rebuttable presumption of 50/50 joint custody.
• The New Rule: The court automatically assumes that splitting parenting time and major decision-making exactly 50/50 is the best thing for the child.
• Shifting the Burden: If one parent does not want a 50/50 split, the burden is on them to prove to the judge why an equal split is a bad idea. They have to show clear evidence that 50/50 would harm the child or just won't work logistically (like living too far apart).
• The Judge Must Explain: If a judge decides not to give 50/50 custody, they cannot just say no. They are legally required to write down the exact reasons and facts that led to their decision.
• The Safety Exception: This automatic 50/50 rule is completely thrown out if there is a proven history of domestic violence or if a protection order is in place.
2. How Child Support Works with 50/50 Custody
A very common myth is that if you share custody 50/50, nobody pays child support. That is not true in Mississippi.
Mississippi calculates child support based on a flat percentage of income, not on how many nights the child sleeps at your house. Because of this, calculating support with equal custody requires a few steps.
Step 1: Look at the Standard Guidelines
First, the court calculates each parent's Adjusted Gross Income (AGI)—which is their take-home pay after taxes and mandatory deductions. Mississippi's standard law says a non-custodial parent should pay a set percentage of that income:
• 1 child: 14% of AGI
• 2 children: 20% of AGI
• 3 children: 22% of AGI
Step 2: Adjusting for 50/50 Custody
Because both parents are feeding, housing, and clothing the child for half the month, applying those flat percentages blindly would be unfair. Judges use "deviations" (legal adjustments) to fix this based on two main scenarios:
• Scenario A: Parents make similar income. If both parents earn roughly the same amount of money and share the child 50/50, the judge will usually set child support to zero.
• Scenario B: One parent makes significantly more money. If one parent makes $100,000 and the other makes $30,000, the higher-earning parent will almost always still have to pay child support. The goal is to make sure the child doesn't live in a mansion one week and struggle for basic necessities the next.
How Judges Calculate the "Offset"
To keep things fair in high-income gap situations, judges often use the math math method below:
1. Calculate what Parent A would owe Parent B under normal rules.
2. Calculate what Parent B would owe Parent A under normal rules.
3. Subtract the smaller number from the larger number.
4. The higher-earning parent just pays the difference.
The Legal Requirement: To order anything different from the standard percentage guidelines, the judge must explicitly state in writing that the normal formula would be unjust or unfair because of the 50/50 schedule.
The new 50/50 rule does not apply to custody modifications.
The lawmakers wrote the bill this way on purpose to prevent a massive wave of old cases flooding back into court. They wanted to make sure parents couldn't just reopen an old case just because the law changed.
Here is exactly how it breaks down for any cases handled after July 1, 2026:
1. It is Strictly for Brand-New Cases
The 50/50 starting point only applies to initial cases. This means it only affects:
• Parents who are getting divorced for the first time.
• Unmarried parents who are going to court to establish
custody for the very first time.
2. The Law Itself is Not an Excuse to Change Custody
If a parent already has a custody order from 2024 or 2025, they cannot walk into court on July 2 and say, "Hey, the law changed, so I want my 50/50 now." The court will instantly reject that argument. The new law is not considered a valid reason to change an old agreement.
3. Old Rules Still Apply to Changes
If a parent wants to modify an existing custody order after July 1, they still have to do it the hard, traditional way. They must prove to the judge three strict things:
1. There has been a major, unexpected change in the other parent's home since the last order.
2. This change is harmful to the child.
3. Changing custody is completely in the child's best interest.
Even if a parent manages to prove all three points and convinces the judge to reopen the case, the judge still will not use the 50/50 rule. Instead, the judge will look at the case from scratch using the traditional factors to figure out what schedule is best.
Dustin Thomas
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228-696-8881
