Does Florida’s 50/50 Time-Sharing Presumption Apply to Old Plans?

26 Apr Does Florida’s 50/50 Time-Sharing Presumption Apply to Old Plans?

Summary

This article examines whether Florida's 2023 rebuttable 50/50 time-sharing presumption applies when modifying a parenting plan entered before the statutory amendment, walking through the substantial change threshold under section 61.13, Florida Statutes, and controlling appellate authority. It analyzes the historical treatment under Langdon, D.M.J., Hahn, and Bachman, then evaluates the retroactivity defense rooted in Smiley v. State and McClam v. Carrier for parents and practitioners in Miami-Dade and Broward Counties.

Few questions in modern Florida family law generate as much confusion as whether the 50/50 time-sharing presumption Florida courts now apply to new cases also governs the modification of older parenting plans. Parents in Miami-Dade County, Broward County, and throughout South Florida who are operating under a parenting plan entered before 2023 frequently ask whether the recent statutory shift toward equal time-sharing automatically reshapes their existing arrangement. The answer is more nuanced than a simple yes or no, and it implicates two of Florida’s most established doctrines: the high threshold for modifying a parenting plan, and the strong constitutional and statutory presumption against retroactive application of substantive changes to the law.

Understanding how the 50/50 time-sharing presumption Florida courts apply interacts with a pre-2023 final judgment is essential for any parent contemplating a modification action. It also matters for parents responding to a modification petition that invokes the new statutory regime as if the prior judgment never existed. This article walks through the modification standard under section 61.13, Florida Statutes, the 2023 reform that introduced the rebuttable equal time-sharing presumption, and the body of Florida appellate case law that limits the retroactive reach of substantive statutory amendments. By the end, parents and practitioners alike will have a working framework for analyzing whether the equal time-sharing rule applies in a particular pre-2023 modification proceeding.

Understanding Florida’s Modification Standard for Parenting Plans

Before any analysis of the 50/50 time-sharing presumption Florida law now imposes, it is essential to recognize that modifying a parenting plan in Florida is not a casual exercise. Florida courts have consistently described the burden as “extraordinary,” and that characterization is rooted in both statutory text and decades of appellate jurisprudence. A parent who simply prefers a different schedule, or who has experienced ordinary changes since entry of the prior judgment, will not meet the bar.

The Substantial, Material, and Unanticipated Change Threshold

To open the door to modification of a parenting plan and time-sharing schedule, the movant must demonstrate a substantial, material, and unanticipated change in circumstances. The Second District Court of Appeal articulated this rule clearly in Langdon v. Langdon, 96 So. 3d 1053 (Fla. 2d DCA 2012), holding that the threshold is a prerequisite to the court even reaching the best interests analysis. The change in circumstances cannot be one that the parties anticipated at the time of the original judgment. Furthermore, the change must be sufficiently weighty to justify disturbing a judicial determination that has been embedded in the parties’ lives for months or years.

The Fourth District Court of Appeal reaffirmed the rigor of this standard in D.M.J. v. A.J.T., 190 So. 3d 1129 (Fla. 4th DCA 2016), explaining that a time-sharing schedule “may not be modified” without the requisite showing and that the movant bears an “extraordinary burden” to prove the substantial change in circumstances. Notably, this language makes clear that the modification bar is not merely a procedural hurdle. It is a substantive limit on judicial authority to revisit settled custody arrangements. Even when the 50/50 time-sharing presumption Florida law currently endorses might appear inviting on paper, no court can apply that presumption to a modification proceeding unless the threshold has first been satisfied.

The Best Interests Component

Once the substantial change threshold is met, the court must determine whether the requested modification serves the best interests of the child. Langdon v. Langdon, 96 So. 3d 1053. The best interests inquiry incorporates the statutory factors listed in section 61.13, Florida Statutes, and it is fact-intensive. Courts examine the child’s relationship with each parent, the moral fitness of the parents, the developmental needs of the child, and many other considerations. The 50/50 time-sharing presumption Florida law now embeds in the statute is a presumption that operates within this best interests inquiry. Consequently, the presumption does not stand alone. It exists as a default lens through which the court evaluates whether a particular schedule serves the child.

The Res Judicata Effect of Final Judgments

Florida appellate decisions emphasize that the modification standard reflects more than judicial caution. It reflects the res judicata effect of the original final judgment. In C.N. v. I.G.C., 291 So. 3d 204 (Fla. 5th DCA 2020), the Fifth District Court of Appeal explained that the modification rule “establishes a presumption in favor of the reasonableness of the original decree.” In other words, the prior judgment is presumed to be correct, and the party seeking change bears the responsibility to overcome that presumption. This principle is central when evaluating whether the 50/50 time-sharing presumption Florida courts now apply can be wielded to undo or substantially alter an older judgment that was lawfully entered under the legal framework existing at that time.

The 2023 Statutory Shift: A Rebuttable Presumption of Equal Time-Sharing

Florida’s parenting plan landscape changed meaningfully when the Legislature amended section 61.13, Florida Statutes, to incorporate a rebuttable presumption in favor of equal time-sharing. Specifically, the statute now provides that, unless otherwise provided in the section or agreed to by the parties, there is a rebuttable presumption that equal time-sharing of a minor child is in the best interests of the minor child. This is the source of the 50/50 time-sharing presumption Florida practitioners now invoke in custody proceedings throughout the state, including in the Eleventh Judicial Circuit in Miami-Dade County and the Seventeenth Judicial Circuit in Broward County.

What the Current Statute Says About Creating or Modifying Plans

The statutory excerpt in section 61.13, Florida Statutes, instructs that the rebuttable presumption applies when courts are “creating or modifying a time-sharing schedule.” § 61.13, Fla. Stat. (effective until October 1, 2025). To rebut the presumption, a party must prove by a preponderance of the evidence that equal time-sharing is not in the child’s best interests. Furthermore, except where the parties agree on a time-sharing schedule and the court approves it, the court must evaluate the statutory best interests factors and make specific written findings of fact when creating or modifying a time-sharing schedule. § 61.13, Fla. Stat. The structural shift represented by the 50/50 time-sharing presumption Florida now operates under is significant because it inverts the traditional burden allocation in a fundamental way.

Additional procedural mechanics for parenting and time-sharing matters appear in the broader chapter, including provisions found at section 61.13001, Florida Statutes, which governs relocation and related matters. Fla. Stat. § 61.13001. While that statute is not the source of the equal time-sharing presumption, it illustrates how Florida’s parenting law operates as an interrelated whole. Practitioners drafting motions to modify must always consider how the 50/50 time-sharing presumption Florida courts apply interacts with adjacent provisions of the chapter.

How the Presumption Operates in Practice

Under a straightforward reading of the statute, when a court is properly engaged in modifying a time-sharing schedule, the presumption shifts the evidentiary burden to the party who opposes equal time-sharing. That party must affirmatively prove by a preponderance of the evidence that an equal schedule is not in the child’s best interests. Notably, this burden allocation is the opposite of how courts treated time-sharing decisions in the years following the 2008 amendments to section 61.13. The 50/50 time-sharing presumption Florida law now imposes is, therefore, both a substantive and procedural change of considerable magnitude.

For modifications of pre-2023 parenting plans, the operational question becomes whether this presumption attaches once the substantial-change threshold is satisfied, or whether the presumption is itself a substantive alteration of rights that cannot be applied to disturb an existing final judgment. That question is the heart of the retroactivity analysis discussed later in this article.

Why the Pre-2023 Era Matters: Historical Treatment Under Section 61.13

To appreciate the retroactivity argument, it helps to understand how Florida courts treated time-sharing decisions before the 2023 statutory shift. The history of section 61.13 reveals that the Legislature has revised parenting law multiple times, and each revision has carried its own legal implications. Importantly, prior amendments did not carry an equal time-sharing presumption, and at least one Florida appellate decision held that retroactively imposing a 50/50 schedule based on those prior amendments impaired existing rights.

The 2008 Amendments and Hahn v. Hahn

The 2008 amendments to section 61.13, Florida Statutes, restructured how Florida law speaks about custody and visitation. Following those amendments, courts continued to recognize that the statute required best interests findings and did not establish a presumption favoring 50/50 time-sharing. The Second District Court of Appeal made this point explicit in Hahn v. Hahn, 42 So. 3d 945 (Fla. 2d DCA 2010). The court explained that even after the legislative restructuring, the statutory scheme did not create a presumption of equal time-sharing. Consequently, the 50/50 time-sharing presumption Florida currently applies is not merely an extension of the 2008 framework. It is a distinct legal innovation that postdates the older parenting plans now subject to modification petitions.

The Bachman v. McLinn Terminology Shift

The 2008 amendments also replaced older terminology with new language. The Fifth District Court of Appeal in Bachman v. McLinn, 65 So. 3d 71 (Fla. 5th DCA 2011), described how the amendments removed references to “custody” and “visitation” and substituted “parenting plan” and “time sharing.” Although the terminology shift was primarily linguistic, the court’s discussion underscores that statutory amendments to family law concepts often carry consequences beyond their words. For our purposes, Bachman illustrates that Florida appellate courts pay careful attention to legislative changes affecting parenting law and consider whether each amendment alters substantive rights or merely modernizes language. The 50/50 time-sharing presumption Florida courts now apply is unmistakably substantive in nature, which is precisely why retroactivity becomes a live issue for pre-2023 plans.

Retroactivity: Florida’s Strong Presumption Against Backward-Looking Statutes

Florida law is firmly committed to the principle that statutes affecting substantive rights apply prospectively unless the Legislature clearly directs otherwise. This presumption protects vested rights, settled expectations, and the stability of judgments. The presumption is especially relevant when evaluating whether the 50/50 time-sharing presumption Florida now embeds in the statute can be applied to a modification of a parenting plan that was finalized years before the 2023 enactment.

Smiley v. State and the Substantive Rights Framework

The Florida Supreme Court’s analysis in Smiley v. State, 966 So. 2d 330 (Fla. 2007), articulates the foundational rule. Florida courts presume that statutes affecting substantive rights apply prospectively absent clear legislative intent to the contrary. The presence of an effective date in a statute is itself considered evidence that the Legislature did not intend retroactive application. Furthermore, when retroactive application of a substantive change would impair existing rights, courts disfavor that result on both statutory construction grounds and constitutional grounds. The 50/50 time-sharing presumption Florida codified in 2023 is a substantive rule that allocates burdens of proof and shapes the underlying best interests determination. As a result, Smiley provides a strong basis for arguing that the presumption should not apply to alter the legal baseline of a parenting plan entered before the amendment.

McClam v. Carrier and Vested Rights in Family Law

The First District Court of Appeal addressed retroactivity in the family law context in McClam v. Carrier, 373 So. 3d 363 (Fla. 1st DCA 2023). The court explained that the inclusion of an effective date is evidence rebutting any intent for retroactive application, and that retroactive application that impairs existing rights is disfavored. Most importantly for the present analysis, the court observed that the retroactive application of the 2008 amendments to remove a former wife’s designation as “primary residential parent” and impose 50/50 time-sharing “clearly impaired” her existing rights. McClam v. Carrier, 373 So. 3d 363. That holding has obvious implications for parents whose pre-2023 parenting plans designate primary residential responsibilities or allocate non-equal time-sharing in a manner inconsistent with the new 50/50 time-sharing presumption Florida now imposes on new cases.

The McClam decision is particularly powerful for two reasons. First, it confirms that parenting plan terms carry substantive legal weight and that altering them retroactively can impair vested rights. Second, it specifically addresses the imposition of 50/50 time-sharing as the kind of substantive change that triggers retroactivity concerns. Together with Smiley, the case provides a robust foundation for arguing that the post-2023 equal time-sharing presumption cannot be applied to revisit the legal baseline of a pre-2023 final judgment without clear legislative intent to that effect.

Applying the Framework to a Pre-2023 Parenting Plan Modification

Bringing the threads together, the analysis of whether the 50/50 time-sharing presumption Florida law now imposes applies to modification of a pre-2023 parenting plan unfolds in a series of steps. Each step has significance, and skipping any one of them risks an incorrect or incomplete legal analysis.

Step One: Establishing a Substantial, Material, and Unanticipated Change

The threshold question is unaffected by the 2023 amendments. A movant seeking to modify any pre-2023 parenting plan must satisfy the substantial-change requirement articulated in Langdon v. Langdon, 96 So. 3d 1053, and D.M.J. v. A.J.T., 190 So. 3d 1129. Without that threshold showing, the court has no authority to revisit time-sharing, regardless of how compelling the policy preferences embedded in the 50/50 time-sharing presumption Florida law now reflects might appear. This step preserves the res judicata effect emphasized in C.N. v. I.G.C., 291 So. 3d 204, and prevents litigants from leveraging statutory change as a cover for what would otherwise be a routine reconsideration of the original judgment.

Step Two: Determining the Child’s Best Interests

If the threshold is satisfied, the court turns to whether modification is in the child’s best interests. Langdon v. Langdon, 96 So. 3d 1053. The best interests analysis incorporates the statutory factors and reflects the totality of the child’s circumstances. Whether the 50/50 time-sharing presumption Florida currently applies governs this analysis in a pre-2023 modification proceeding is the precise question at issue.

Step Three: Litigating Whether the Presumption Governs

The parties may legitimately litigate whether the presumption operates in the modification proceeding. § 61.13, Fla. Stat. The statutory text references “creating or modifying” a time-sharing schedule, which on its face suggests that the presumption applies to modification proceedings. However, the statutory text alone does not resolve the retroactivity question, because statutes operate against a background of constitutional and common-law rules limiting retroactive application of substantive changes. Counsel for both sides should prepare to address whether the 50/50 time-sharing presumption Florida law now imposes is a substantive alteration of rights or a procedural rule that can apply prospectively to modification proceedings without disturbing the original judgment.

Step Four: Asserting the Retroactivity Defense

The party opposing application of the presumption can argue that doing so would be an impermissible retroactive impairment of rights vested in the original parenting plan. Smiley v. State, 966 So. 2d 330; McClam v. Carrier, 373 So. 3d 363. The argument has three core components. First, the 50/50 time-sharing presumption Florida codified in 2023 affects substantive rights because it reallocates the burden of proof and reshapes the best interests determination. Second, the Legislature did not clearly direct retroactive application, and the inclusion of an effective date supports prospective application. Third, applying the presumption to a pre-2023 parenting plan would impair vested rights established in the original final judgment, mirroring the concern identified in McClam. Together, these points form a coherent defense to the application of the 50/50 time-sharing presumption Florida courts otherwise routinely apply in newer cases.

Practical Implications for Miami-Dade and Broward County Cases

The competing principles described above are not abstract academic exercises. In Miami-Dade County, Broward County, and throughout the Eleventh and Seventeenth Judicial Circuits, judges and litigants encounter modification petitions involving pre-2023 parenting plans with regularity. The 50/50 time-sharing presumption Florida courts apply has real consequences for trial strategy, witness selection, and the framing of evidence.

Pleading Strategy for the Movant

A movant seeking equal time-sharing in a pre-2023 modification should plead facts that satisfy the substantial-change threshold without relying on the 2023 statutory shift as the change itself. Statutory amendments are not, in themselves, a substantial change in circumstances. The movant should focus on factual developments since the entry of the prior judgment, such as relocation, changes in the child’s needs, evolving work schedules, or shifts in the parents’ relationships with the child. Once the threshold is established, the movant can then advance the position that the 50/50 time-sharing presumption Florida law now adopts should govern the best interests analysis.

Pleading Strategy for the Respondent

A respondent defending against modification should be prepared to challenge both the threshold showing and the application of the equal time-sharing presumption. As to the threshold, the respondent should highlight any anticipation of the asserted change at the time of the original judgment and emphasize the res judicata principle articulated in C.N. v. I.G.C., 291 So. 3d 204. As to the presumption, the respondent should preserve a retroactivity defense based on Smiley v. State, 966 So. 2d 330, and McClam v. Carrier, 373 So. 3d 363. Even if the court ultimately disagrees, framing the issue early protects the record for appellate review and signals to the trial court that the question is not a foregone conclusion.

Evidentiary Considerations in the Eleventh Judicial Circuit

In Miami-Dade County and Broward County, judges expect both parties to present competent evidence on the best interests factors found in section 61.13. Whether or not the 50/50 time-sharing presumption Florida adopts in 2023 ultimately attaches in a particular pre-2023 modification, the trial court must make specific written findings on the statutory factors when creating or modifying a time-sharing schedule. § 61.13, Fla. Stat. As a practical matter, that means the parties should plan to present a complete factual record on each statutory factor, with documentary support, witness testimony, and where appropriate, expert evaluations. Failing to develop the record on the best interests factors leaves the trial court without the tools it needs to fashion a reasoned ruling, regardless of how the legal presumption question is resolved.

Common Misconceptions About the 50/50 Time-Sharing Presumption

Because the statutory shift toward equal time-sharing is relatively recent, several misconceptions have taken root. The first misconception is that the new 50/50 time-sharing presumption Florida law adopts automatically rewrites every existing parenting plan. As demonstrated above, that view ignores the modification threshold and the retroactivity doctrine. The second misconception is that the presumption requires the trial court to order equal time-sharing in every case. Even in newly filed cases governed by the 2023 amendments, the presumption is rebuttable by a preponderance of the evidence and may be overcome by appropriate proof tied to the statutory best interests factors. § 61.13, Fla. Stat. The third misconception is that the presumption eliminates the need for the trial court to make written findings. To the contrary, the statute requires specific written findings of fact when creating or modifying a time-sharing schedule, except where the parties agree and the court approves the agreement. § 61.13, Fla. Stat.

Additionally, parents often confuse the 2008 framework with the 2023 framework. As Hahn v. Hahn, 42 So. 3d 945, makes clear, the 2008 amendments did not establish a 50/50 presumption. McClam v. Carrier, 373 So. 3d 363, reinforces that retroactive application of the 2008 framework to impose 50/50 time-sharing was found to impair existing rights. These cases collectively establish that the 50/50 time-sharing presumption Florida law currently codifies is a fundamentally new rule, and that older parenting plans were entered in a legal environment that did not include that rule. Treating the older plans as if they were entered under the new regime conflates two distinct legal eras and risks erasing the careful balance struck in the original judgment.

Working with a South Florida Family Law Attorney

If you are a parent in Miami-Dade County or Broward County considering a modification of a pre-2023 parenting plan, or if you have been served with a modification petition that invokes the new 50/50 time-sharing presumption Florida courts now apply, the strategic decisions you make at the outset of the case will shape the trajectory of the litigation. The interplay between the substantial-change threshold, the statutory equal time-sharing presumption, and the retroactivity doctrine is not intuitive. It requires careful pleading, thoughtful evidentiary development, and a willingness to litigate fundamental questions of statutory construction and constitutional law. Parents who attempt to navigate this terrain alone often find themselves outflanked by procedural rules, missed deadlines, and unfamiliar evidentiary standards.

The Law Firm of Jeffrey Alan Aenlle, PLLC focuses exclusively on Florida family law and represents parents throughout South Florida, including Miami-Dade County and Broward County. Whether you are seeking equal time-sharing under the new statutory framework or defending against a petition that overlooks the retroactivity doctrine, our firm provides experienced and detail-oriented advocacy. We understand how local judges in the Eleventh Judicial Circuit and the Seventeenth Judicial Circuit handle these issues, and we are prepared to develop the factual record and the legal arguments necessary to protect your interests and the best interests of your child.

To discuss how the 50/50 time-sharing presumption Florida law now applies to your particular case, including any pre-2023 parenting plan modification, contact the Law Firm of Jeffrey Alan Aenlle, PLLC at +1.786.309.8588. We will review your existing parenting plan, evaluate the strengths and weaknesses of your modification posture, and chart a path forward that aligns with both Florida statutory law and the controlling appellate authorities discussed in this article.

Conclusion

Florida law imposes a stringent standard to modify any parenting plan, including a pre-2023 plan. The movant must prove a substantial, material, and unanticipated change in circumstances and that modification is in the child’s best interests. Langdon v. Langdon, 96 So. 3d 1053; D.M.J. v. A.J.T., 190 So. 3d 1129. Section 61.13, Florida Statutes, now provides a rebuttable presumption that equal time-sharing is in the child’s best interests and requires written findings when creating or modifying a time-sharing schedule. § 61.13, Fla. Stat. Nonetheless, Florida law strongly disfavors retroactive application of substantive statutory changes absent clear legislative intent, and at least one decision found that retroactively imposing 50/50 time-sharing impaired existing rights. McClam v. Carrier, 373 So. 3d 363. Whether the 50/50 time-sharing presumption Florida now codifies applies in a modification of a pre-2023 plan is a contested retroactivity question. A trial court is likely to require the substantial-change threshold first and then address whether applying the presumption in the best-interests phase would constitute an impermissible retroactive impairment. C.N. v. I.G.C., 291 So. 3d 204; Smiley v. State, 966 So. 2d 330. For parents in Miami and throughout South Florida, careful legal analysis and skilled advocacy are essential to securing a fair outcome in this evolving area of Florida family law.