HB 1662 Mississippi: The 50-50 Custody Law Explained

House Bill 1662, effective July 1, 2026, is the most significant change to Mississippi child custody law in decades. It creates a rebuttable presumption that joint physical and legal custody with equal parenting time is in the child's best interest. If you are filing a custody case now, the rules are fundamentally different from what existed even a year ago.

What HB 1662 Actually Does

The law establishes three core changes:

1. A 50-50 custody starting point. For all initial custody cases filed on or after July 1, 2026, the court presumes joint physical and legal custody with substantially equal parenting time. This applies to both temporary and final custody orders.

2. The burden shifts to the objecting parent. Under the old framework, neither parent had a presumptive advantage. Now, the parent opposing equal time must prove — by a preponderance of the evidence — that a 50-50 arrangement would harm the child or is practically unworkable (for example, parents living 200 miles apart).

3. Written findings are mandatory. If the chancellor deviates from the 50-50 presumption, the specific reasons must be documented in writing on the court record. This creates a clear appellate trail and makes arbitrary departures from equal custody much harder to sustain.

When the 50-50 Presumption Does Not Apply

HB 1662 includes explicit carve-outs. The presumption is completely barred when:

• Domestic violence is documented. Under Mississippi Code Section 93-5-24, a parent with a history of domestic violence — a single incident causing serious bodily injury or a pattern of repeated abuse — triggers a presumption that awarding custody to that parent would be detrimental to the child.
• A parent is a registered sex offender or is currently in the custody of the Mississippi Department of Corrections.
• Post-decree modifications. The 50-50 presumption applies only to initial custody orders, not to modifications of existing orders. Modifications still require proving a material change in circumstances under the Riley v. Doerner standard.

How to Rebut the Presumption

If you believe equal custody is not appropriate for your situation, you need concrete evidence. Vague concerns about the other parent's lifestyle are not sufficient. Arguments that chancellors evaluate include:

• Geographic distance that makes mid-week exchanges impractical for school-age children
• Work schedules (such as overnight shifts or frequent travel) that prevent consistent caregiving during assigned time
• The child's established routine — disrupting a stable school, medical, and extracurricular pattern can count against equal time
• Documented substance abuse, untreated mental health conditions, or neglect
• A parent's demonstrated unwillingness to cooperate on scheduling, medical decisions, or school communications

The chancellor evaluates these through the 12 Albright factors, the traditional best-interest test that has governed Mississippi custody decisions since 1983.

How the 50-50 Presumption Works in Practice

Equal parenting time does not mean both parents must have exactly the same number of hours each week. Chancellors evaluate whether the proposed schedule provides substantially equal overnights over a reasonable cycle — typically measured across a two-week or monthly period.

Common schedules that satisfy the presumption:

• Alternating weeks (7-7): The child spends one full week with each parent, exchanging on Fridays. Works best for school-age children when both parents live near the same school.
• 2-2-3 rotation: Two days with Parent A, two with Parent B, three with Parent A, then the pattern flips. Designed for infants and toddlers who need frequent contact with both parents.
• 5-2-2-5 rotation: Parent A always has Mondays and Tuesdays, Parent B has Wednesdays and Thursdays, and weekends alternate. Creates maximum predictability.

The parenting plan must also address holiday and vacation schedules, exchange logistics (time, location, transportation), communication protocols during the other parent's time, and a dispute resolution mechanism — typically mediation before returning to court.

Child Support Under the New Framework

HB 1662 also replaced Mississippi's old flat-percentage child support model with a comparative income-shares approach. Under the old system, the non-custodial parent paid a flat percentage (14% for one child, 20% for two) of their income, regardless of what the other parent earned.

Under the new model for 50-50 custody cases:

• Both parents' adjusted monthly incomes are calculated
• The court determines each parent's base obligation using statutory guidelines published by the Mississippi Department of Human Services
• The higher-earning parent pays the difference to the lower earner
• A Shared Parenting Expense Adjustment applies when the paying parent has at least 88 overnights per year

For example, if Parent A earns $5,000 per month and Parent B earns $3,000 per month, with two children, each parent's base obligation is calculated at 20% of their income ($1,000 and $600 respectively). The higher earner pays the $400 difference — significantly less than the $1,000 the old flat-percentage formula would have required.

The court retains discretion to adjust for extraordinary medical or educational expenses, geographic distance between households, and health insurance premiums paid directly by either parent.

What You Need to Do Now

If you are filing a custody case in Mississippi today, HB 1662 changes your preparation strategy:

• If you want 50-50 custody: The law is now on your side as the default. Focus on presenting a workable parenting schedule and demonstrating your ability to cooperate.
• If you believe 50-50 is not appropriate: Start building documented evidence now. You need specific, provable facts — not opinions — tied to the Albright factors.
• Prepare your financials: The new income-shares child support calculation requires both parents to submit detailed Rule 8.05 financial declarations with tax returns, pay stubs, and account statements.

The Mississippi Child Custody & Parenting Plan Guide covers HB 1662's requirements in detail, including a Parenting Schedule Comparison worksheet for evaluating 50-50 arrangements and a Child Support Worksheet aligned with the new income-shares model.

The Bottom Line

HB 1662 makes equal parenting time the starting point in Mississippi, not the exception. Whether you are pursuing a 50-50 arrangement or preparing to challenge it, understanding exactly how the presumption works — and what evidence the chancellor needs — is the most important preparation step you can take.

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