Mississippi’s new 50/50 custody presumption, explained

Mississippi custody law just went through its biggest change in a generation. For new custody cases decided on or after July 1, 2026, Mississippi courts now start from a rebuttable presumption that joint custody with equally shared parenting time is in the child’s best interest (Miss. Code § 93-5-24, as amended by House Bill 1662, Ch. 467, Laws of 2026).

What the new law says

Under the amended statute, a chancellor deciding custody begins from the presumption that the child should have equal parenting time with both parents. The presumption can be overcome — but only by a preponderance of the evidence, and a court that does not award joint custody with equal time must document its reasons for deviating. That documentation requirement has teeth: it gives the parent seeking equal time something concrete to hold the court to, and it gives the parent opposing it a clear evidentiary target.

When it applies — and when it doesn’t

The presumption’s reach is precise, and this is where most people get it wrong:

• It applies to initial custody orders — temporary or final — entered after July 1, 2026.
• It does not apply to modifications of an existing custody order, no matter when the modification is filed.
• Existing orders are not disturbed. The new law does not reopen custody arrangements already in place.

For modifications and for orders entered before July 1, 2026, Mississippi’s familiar best-interest framework — the Albright factors — continues to control. And even in new cases, those factors still shape how the presumption plays out in practice.

How the presumption can be rebutted

The statute lists the grounds a court may rely on to deviate, including: the parents’ own agreement on custody; a preponderance finding that a parent’s absence, mental illness, substance abuse, or other circumstances make equal time against the child’s best interest; an established family-violence presumption; or a parent who is a registered sex offender or in Department of Corrections custody.

Equal time changes the child-support math

The same law rewrote how child support works when a court orders equal parenting time. Instead of the ordinary one-parent guideline, the statute directs an offset: the percentage guideline is computed for each parent as if that parent were the paying parent, and the higher-income parent pays the difference to the other.

Equal parenting time does not mean zero child support — it means a different calculation, and the difference between the two methods can be dramatic. Run both numbers before agreeing to anything.

The firm’s free Mississippi child-support estimator handles both the ordinary guideline and the new equal-time method, including the situations where the two interact.

An honest caveat

One question the statute leaves open: the 50/50 presumption is limited to new orders, but the equal-time support formula is written to apply whenever a court actually awards equal time — however the case got there. Whether that formula governs when a judge grants equal time in a modification has not yet been resolved by a Mississippi appellate court. If that is your situation, the number is worth an actual conversation rather than an assumption.

The practical takeaway

If you are starting a Mississippi custody case, the ground rules have shifted — the case now begins at equal time, and the parent who wants a different outcome carries the burden. If you already have an order, nothing changed automatically. Either way, the support math deserves a fresh look. The firm handles custody and support matters across the Mississippi Gulf Coast; contact the firm to talk it through.