“Material and substantial,“
in the statute and
in practice.
A Texas court will not modify a final order just because someone changed their mind. Texas Family Code § 156.101 requires the moving party to prove a “material and substantial change” in circumstances since the last order was signed. The standard has two prongs that both have to be met. “Material” means real, documented, not speculative. “Substantial” means significant enough to affect the original arrangement, not a minor tweak.
The change has to have occurred since the last order. Anything the court already considered cannot be the basis for modification. That sounds obvious and trips people up constantly. If a behavior pattern existed at the time of the original decree, the court treats it as already accounted for, even if the parent now wishes the decree had handled it differently. The burden lives with the moving party, and most modifications turn on whether the documentation makes the change visible enough to take seriously.
The three paths under § 156.101.
Texas Family Code § 156.101 gives three independent routes to modify conservatorship or the right to designate primary residence. Any one of them is enough. The first is the standard material-and-substantial-change route, which carries the bulk of contested modifications and depends on the documentation we discussed above.
The second is the child-preference route. Under § 156.101 read alongside § 153.009, a child age 12 or older who has expressed a preference for primary residence can trigger the court’s consideration of a change. The judge interviews the child privately in chambers. The preference is a factor, not a verdict.
The third is the voluntary-relinquishment route. If a parent has voluntarily given up primary care of the child to another person for at least six months, the court can modify the order to reflect what is already happening on the ground. This route tends to apply when one parent has effectively stepped back without a formal handoff.
The 1-year affidavit rule (§ 156.102).
Texas Family Code § 156.102 imposes a higher bar inside the first year of an order. If the existing order is less than 12 months old AND the modification seeks to change the right to designate the child’s primary residence, the moving party has to file a sworn affidavit before the court will even hear the request.
The affidavit has to allege one of three things. First, that the child’s present environment endangers physical health or significantly impairs emotional development. Second, that the person with the right to designate primary residence has voluntarily relinquished primary care of the child to the moving party for at least six months and the proposed change is in the child’s best interest. Third, that both parties have agreed to the change.
If the affidavit does not establish one of those grounds, the court denies the request without a hearing. After the one-year mark passes, the standard § 156.101 framework controls without the affidavit requirement.
Child support: the two independent paths.
Child support modification under § 156.401 has its own structure with two independent triggers. Either one stands alone. The first is the same material and substantial change framework that governs conservatorship modifications. Most often that means a significant income change for the obligor or obligee, or a meaningful change in the child’s needs.
The second is purely numerical. If at least three years have passed since the last support order AND the amount that would be ordered today under current Texas guidelines differs from the existing order by 20% or $100 (whichever is less), the court can modify support without any other showing. No “change” is required. The math itself is enough.
The current Texas guideline percentages (20% of net resources for one child, 25% for two, scaling up to 40% for five or more) apply to the obligor’s first $11,150 of monthly net resources. Above that cap, the court can order more based on proven needs of the child. We run the numbers before filing so you know whether asking is worth what it costs.
When mediation is required first.
Most Travis County family-law courts have standing orders that require attempted mediation before a modification case is set for a contested final hearing. The exact wording varies by court, but the practical effect is consistent: you do not get a final hearing date until mediation has been tried in good faith.
Mediation is also where most modifications actually resolve. The structural reason is straightforward. Modifications run on incomplete information until both sides have produced current financials, school records, and whatever else the issue turns on. Once that information is on the table, the realistic settlement zone is usually visible, and a skilled mediator can close the gap in a single day.
A handful of exceptions exist. Cases with active family-violence history may be exempt under local rules. Emergency modifications (typically tied to immediate child safety) can move on faster tracks. Military-duty modifications under § 156.103 follow their own statutory procedures. For most modifications, plan on mediation as a real step, not a formality.
How a modification case actually unfolds.
A typical contested modification in Travis County runs three to seven months from filing to final order. The case is filed in the same court that issued the original decree, under the original case number, often in front of the same judge. The first 45 to 60 days handle service, temporary orders if needed, and an exchange of basic information.
Discovery follows. For most modifications that means current pay stubs, tax returns, bank records, and whatever documents the substantive issue depends on (school records, medical records, employment records). The discovery phase usually runs 60 to 120 days. Mediation is scheduled near the end of that window, after both sides have what they need to negotiate honestly.
If mediation produces a settlement, the attorneys draft an agreed modification order and the case prove-ups in front of the judge. If mediation does not resolve, the case sets for final hearing, typically four to six weeks out. Most modifications never reach a contested final hearing. The ones that do are usually about disputed facts, not legal interpretation.
What does not count as a change.
The category of complaints that look like changes but are not is large enough to matter. Ordinary disagreement with the original order does not qualify, no matter how strong the disagreement. The order is treated as correct when entered, and second-guessing the original decision is not a change in circumstances.
A new partner you dislike is not a change. Texas does not police lifestyle decisions of the other parent absent actual harm to the child. A single bad weekend, a missed exchange, or a one-off dispute is not a pattern. Courts look for sustained changes that affect the arrangement, not isolated incidents.
Wanting more time with the child because the child is older is not, by itself, a change. The child aging is not unanticipated; the original order presumed it would happen. What can qualify is a documented change in the child’s needs (medical, educational, behavioral) that the existing schedule does not accommodate. The distinction matters. We tell clients honestly when what they are describing is a genuine modification case and when it is something the court will not consider.
A moving target until they’re 18.
Custody, support, and the parenting schedule are all moving targets until the youngest child turns 18. The framework above exists because the legislature understands that no possession schedule designed for a six-year-old will fit a sixteen-year-old, no support number set in the year of the divorce will track the next decade of careers, and no parenting plan can anticipate every medical, educational, or geographic shift a family will encounter. Modifications are part of the original design — built into Chapter 156 from the start — not an exception to it.
The discipline is on which changes the system will actually entertain. Real, documented changes get heard. Imaginary or speculative ones do not. Documentation — pay stubs, school records, medical files, message archives that show a sustained pattern — is what separates the cases the court will move on from the ones it will not. Most modifications that get filed do not need a contested final hearing to resolve; the documentation, once it is in front of both sides, tends to move the conversation toward the realistic answer well before trial.