More States Moving Toward 50/50 Shared Parenting Presumption

What a Shared Parenting Presumption Actually Means

A legal presumption is a starting point, not a guarantee. When a state adopts a shared parenting presumption, it tells courts to begin custody deliberations from the assumption that both parents should have approximately equal time with the child — usually defined as somewhere between 35 and 50 percent of overnight time. A parent who wants a different arrangement must then present evidence explaining why equal time is not in the child's best interest.

This is a meaningful reversal from the traditional model, where the parent seeking more time often bore the burden of arguing for it. Under a presumption framework, the default changes — and so does who has to make the case.

Which States Are Moving on This

Several states have passed or significantly advanced shared parenting legislation in recent years. Kentucky was among the first to adopt a strong shared parenting presumption, and research tracking outcomes there has been cited in legislative debates elsewhere. States including Missouri, West Virginia, and others have moved similar bills through at least one chamber, while advocacy groups have introduced legislation in more than a dozen additional states.

The specific language matters enormously. Some bills create a rebuttable presumption of equal time; others simply require courts to consider shared parenting as a preferred outcome without making it a default. Families need to check the specific law in their state — the practical effect varies widely.

Arguments For and Against

Proponents argue that children benefit from strong relationships with both parents, that shared parenting reduces conflict by balancing power between parents, and that it reflects modern parenting realities where fathers are increasingly primary caregivers. Research from social science supports that children in stable shared arrangements often have better outcomes across mental health, academic, and social measures.

Critics — including some domestic violence advocates — raise concerns that a blanket presumption can be dangerous in households with a history of abuse or high conflict. They argue that judges need discretion, and that a presumption risks forcing children into arrangements that harm them. Most bills include carve-outs for domestic violence, substance abuse, and other safety concerns, but opponents argue these carve-outs are not always sufficient in practice.

What This Means for Existing Orders

If your state adopts a shared parenting presumption after your custody order is already in place, that alone is generally not enough to trigger a modification. You would still need to demonstrate a substantial change in circumstances. However, the new law would apply in any future modification hearing, potentially making it easier to argue for equal time if your arrangement currently skews heavily toward one parent.