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A parent loses a longtime job. Another receives a major promotion. A child develops medical needs that did not exist when the original order was signed. These changes can place immediate pressure on a family, but they do not automatically change the amount owed. Grounds for Child Support Modification in Texas are established by Texas Family Code §156.401, and the statute—not simply a parent’s sense that the current arrangement has become unfair—determines whether an order qualifies for review.
Texas law generally provides two routes: a material and substantial change in the circumstances of the child or a person affected by the order, or, in qualifying cases, the passage of three years combined with a sufficient difference between the existing amount and the current guideline amount. Agreed orders that departed from the guidelines are treated differently, and several circumstances that parents commonly raise do not establish a ground by themselves.
This guide explains what can qualify an order for modification and what cannot. It does not address how often support may be reconsidered, how a case is filed, or how a claimed change must be proven—each of those questions has its own guide, linked where it belongs. At the Law Office of Bryan Fagan, PLLC, our mission is educating families and protecting futures by turning complicated Texas family-law rules into clear, practical information. The sections ahead will help you identify the legal questions that matter and approach your next decision with greater clarity and peace of mind.
Key Takeaways
- Two general grounds. A material and substantial change in circumstances, or the three-year-plus-guideline-difference test.
- The change ground is a comparison. It measures circumstances at a fixed statutory point against circumstances now.
- Chapter 156 settles four circumstances itself — and one of them removes the change requirement entirely in a narrow Title IV-D situation.
- An agreed order that departs from the guidelines is treated differently. One of the two general grounds is unavailable to it.
- Three provisions say what does not count. Paying extra, a new spouse’s resources, and the receiving parent’s own rising costs each have their own rule.
Quick Answer
What qualifies for child support modification in Texas? Section 156.401 provides two general grounds for changing the amount: circumstances have materially and substantially changed, or three years have passed and the ordered amount differs from the guideline amount by 20 percent or $100. Separate provisions settle particular circumstances, limit agreed non-guideline orders, and identify what does not establish a ground on its own.
What Does Texas Family Code §156.401 Require?
The Grounds for Child Support Modification in Texas are set out primarily in Texas Family Code §156.401. The statute generally provides two alternative grounds: a material and substantial change in circumstances or the three-year guideline-difference test. A parent ordinarily needs to establish one—not both.
Under the first ground, the circumstances of the child or a person affected by the order must have materially and substantially changed. The court compares current circumstances with those existing at the statutory baseline, which is generally the earlier of the date the order was rendered or the date a qualifying mediated or collaborative-law settlement agreement was signed. Our guide to material and substantial changes in Texas child support explains how this comparison works in practical situations.
The second ground requires two conditions. At least three years must have passed since the order was rendered or last modified, and the existing monthly amount must differ by either 20 percent or $100 from the amount the current guidelines would produce. Time alone is insufficient, and a guideline difference alone does not satisfy this particular ground.
A separate limitation applies when the parents agreed to an amount that differed from the guidelines. Under §156.401(a-1), that order generally may be modified only by establishing a material and substantial change in circumstances. The three-year route is unavailable, making the terms and history of the existing order an essential part of the analysis.
What the statute provides
§156.401(a)(1) — the circumstances of the child, or of a person affected by the order, have materially and substantially changed since the earlier of the date the order was rendered, or the date a mediated or collaborative-law settlement agreement the order is based on was signed.
§156.401(a)(2) — three years have passed since the order was rendered or last modified, and the monthly amount under the order differs by 20 percent or $100 from the amount the guidelines would produce.
What Is a Material and Substantial Change in Child Support?
The Family Code does not define the phrase, and it provides no list of life events that qualify. What the statute does supply is the structure: a comparison between the circumstances as they stood at the statutory point above, and the circumstances as they stand now.
That has a practical consequence worth stating plainly. A description of a present difficulty — however real — is only one side of the comparison. The question a court is answering is not whether circumstances are hard, but whether they are different from what they were when the order was put in place.
The change must concern the child, or a person affected by the order. Neither “permanent” nor “ongoing” appears as an element in §156.401.
Section 156.402 governs how the guidelines bear on the analysis; it does not add a ground. Under §156.402(a) a court may consider the child support guidelines for single and multiple families under Chapter 154 to determine whether there has been a material or substantial change of circumstances that warrants modification, if the modification is in the best interest of the child. Under §156.402(b), if the amount in the order does not substantially conform with those guidelines, the court may modify the order to substantially conform with them, again if the modification is in the child’s best interest, and may consider other relevant evidence in addition to the guideline factors.
How Texas Courts Apply the Comparison
Texas appellate courts require evidence of both sides of the comparison. In In re C.C.J. and C.M.J., the Dallas Court of Appeals stated that a trial court deciding whether circumstances have materially and substantially changed must examine and compare the circumstances of the parents and any minor children at the time of the initial order with the circumstances existing when modification is sought, and that the record must contain both historical and current evidence of the relevant person’s financial circumstances — without both sets of data, the court has nothing to compare. The court also stated that the movant bears the burden of showing the change.
Applying that rule, the court reversed an increase in child support and rendered judgment denying the modification. The record contained evidence of the mother’s and the children’s expenses at the time of the hearing, but none of their circumstances at the time of the divorce, so there was nothing for the trial court to compare.
London v. London applied the same comparison rule and rejected each alleged change in turn, including a domicile restriction that had not altered, the obligee’s improved income, and savings that had become home equity. On voluntary payments it applied §156.403 directly: past payments above the ordered amount provide no basis to increase support. Comparing the children’s needs at the time of divorce with their needs at the time of modification, the court found no material or substantial change and rendered judgment that the modification claim take nothing.
Trammell v. Trammell shows the other side of the same rule. There the evidence was uncontroverted: the obligor’s income had fallen from roughly $802,000 to $255,000 since an agreed decree set support far above the guidelines, he had exhausted a line of credit and owed about $365,000, and no evidence suggested the decline was voluntary. The court of appeals affirmed the reduction. The point is not that a drop in income qualifies on its own — it is that the record supported both sides of the comparison.
One limit is worth stating. These decisions were issued under earlier versions of §156.401(a)(1), which measured the change from the date of the order’s rendition alone. The current provision measures from the earlier of rendition or the signing of a qualifying settlement agreement. The comparison requirement the case describes is unaffected; the baseline date comes from the statute set out above.
What the Statute Settles
The Grounds for Child Support Modification in Texas usually require a fact-specific comparison, but Texas Family Code §156.401 directly addresses four circumstances. Some establish a material and substantial change, one does not, and one narrow Title IV-D provision removes the change requirement altogether.
The medical-and-dental provision is the narrowest rule in the table. It does not mean that every increase in premiums, uninsured expenses, or medical costs permits modification without a comparison. It applies when a qualifying Title IV-D order lacks the support coverage Texas law requires.
These child-support rules should not be confused with what counts as a material and substantial change in a Texas child custody case. Custody, possession, and access modifications follow a separate statutory framework, even when the same family circumstances affect both issues.
Outside these expressly addressed situations, whether a change qualifies depends on the existing order and the facts being compared. Our Texas child support modification resource explains the broader calculation and modification framework.
| Provision | What it settles |
|---|---|
| §156.401(a-2) | In a Title IV-D case, a court or administrative child support order may be modified at any time, and without a showing of a material and substantial change, to provide medical support or dental support for the child where the order does not provide the coverage required under §§154.182 or 154.1825. |
| §156.401(c) | An order of joint conservatorship, in and of itself, does not constitute grounds for modifying a support order. |
| §156.401(c-1) | Incarceration of a child support obligor in a local, state or federal jail or prison for a period exceeding 180 days is a material and substantial change of circumstances for the purposes of this section. |
| §156.401(d) | Release of a child support obligor from incarceration is a material and substantial change in circumstances if the obligation was abated, reduced or suspended during the period of incarceration. |
When an Agreed Non-Guideline Order Changes the Analysis
Parents sometimes agree to an amount that sits above or below what the guidelines would produce. Where the order came about that way, §156.401(a-1) narrows what follows.
Two details follow. The baseline for these orders is rendition alone — the settlement-agreement alternative that applies to §156.401(a)(1) does not appear here. And the limitation does not displace the narrow Title IV-D rule above: where a qualifying order lacks the required medical or dental support, that support may still be added.
The limit on this
Where the parties agreed to an order under which the amount of support differs from the guideline amount, the court may modify that order only on a showing that the circumstances of the child or a person affected by the order have materially and substantially changed — and that comparison runs from the date the order was rendered. The three-year ground is not available to change the amount of such an order. This narrows the grounds above; it is not a third way to qualify.
What Does Not Independently Establish a Ground
Three provisions address circumstances parents raise. Each operates differently, and the differences matter.
London v. London applied the first of these directly. Rejecting an argument that a history of payments above the ordered amount showed changed circumstances, the court held that §156.403 meant those voluntary payments provided no basis to increase support.
These are not three versions of one rule. The first concerns a history of paying more than the order requires; the second concerns what may be added to or subtracted from net resources in a modification suit; the third concerns one specific proposition — that the obligee’s rising needs, standard of living or lifestyle do not warrant increasing the obligor’s obligation. A request can clear one and still run into another.
| Provision | How it operates |
|---|---|
| §156.403 Voluntary extra payments | A history of support voluntarily provided in excess of the court order does not constitute cause to increase the amount of an existing child support order. |
| §156.404 A new spouse’s resources | In a suit for modification, the court may not add any portion of a new spouse’s net resources to the net resources of an obligor or obligee in order to calculate support. The court also may not subtract the needs of a new spouse, or of a dependent of a new spouse, from the net resources of the obligor or obligee. |
| §156.405 The obligee’s needs, standard of living, or lifestyle | An increase in the needs, standard of living, or lifestyle of the obligee since the rendition of the existing order does not warrant an increase in the obligor’s child support obligation. |
Changes in a Child’s Financial or Medical Needs
Changes in a child’s medical care, insurance costs, childcare, education, or other financial needs may support the Grounds for Child Support Modification in Texas, but none automatically qualifies an order for modification. Under §156.401(a)(1), the question is whether the circumstances of the child or a person affected by the order have materially and substantially changed from the proper statutory baseline.
The comparison matters more than the label placed on the expense. For example, a child’s new need for ongoing therapy may be relevant if that care did not exist when the current order was established. A single medical bill or temporary childcare expense may present a different question because the court must evaluate the overall change in circumstances.
Some of these expenses may also affect the amount calculated after a ground for modification has been established. Chapter 154 permits courts to consider matters such as the child’s age and needs, childcare expenses, health insurance, and extraordinary medical costs in appropriate cases. Those calculation factors should not be confused with automatic grounds under §156.401.
The birth of another child also does not rewrite an existing order by itself. Section 156.404 concerns a new spouse’s resources and prevents those resources from being added to either parent’s net resources for calculating support. When an obligor has a legal duty to support children in more than one household, §156.406 instead directs the court to apply the multiple-family percentage guidelines described in our Texas child support modification resource.
Financial support and custody also require separate legal analyses. If a child’s changing needs may affect primary residence, possession, or decision-making authority, our guide to the grounds for custody modification in Texas explains that distinct framework. Identifying which part of the order needs to change is the first step toward applying the correct standard.
Having a Ground Is Not the Same as Proving It
Everything above concerns eligibility — whether the situation is the kind the statute recognizes. Establishing it to a court is a separate task, and a request can be well founded in law and still fail on the record. Our guide to the evidence required for a Texas child support modification covers what the comparison has to be supported with.
Common Misconceptions
| What people believe | Where that goes wrong |
|---|---|
| “There is a list of changes that qualify.” | The Family Code defines no list. Four circumstances are settled by statute; the rest depend on the comparison and the facts. |
| “Things are hard now, so the order should change.” | The ground asks whether circumstances differ from those at the statutory comparison point, not whether they are difficult. |
| “I’ve been paying extra, so the order should say so.” | Section 156.403 addresses this directly: a history of support voluntarily provided in excess of the order does not constitute cause to increase the ordered amount. |
| “They remarried someone with money.” | Section 156.404 bars adding any portion of a new spouse’s net resources, and equally bars subtracting the needs of a new spouse or a new spouse’s dependent. |
| “We’re joint managing conservators now, so support changes.” | Section 156.401(c) states that an order of joint conservatorship, in and of itself, does not constitute grounds for modifying a support order. |
Where to Go Next
Once a situation appears to fit one of the Grounds for Child Support Modification in Texas, the next step is to identify which statutory route applies and what the existing order actually requires. Start by locating the signed order and any mediated or collaborative-law settlement agreement behind it. Those documents may establish the comparison date, show whether the amount followed the guidelines, and reveal whether the parents agreed to a non-guideline amount.
In straightforward situations, the next question may be whether three years have passed and whether a current guideline calculation differs by the required amount. Our guide to how often child support can be modified in Texas explains that timing analysis, including the separate material-change route and the special treatment of agreed non-guideline orders.
In more complex cases, disputed income, self-employment, changed primary residence, medical support, multiple households, or an interstate order may require closer review. The Texas child support modification process explains the practical paths available through a court case or agency review. Whether the matter may be resolved by agreement, mediation, or a contested hearing depends on the order, the requested change, and whether the other parent disputes it.
Legal Resources and Sources
The Chapter 156 provisions described here were read in full against current Texas legislative materials. Chapter 156 has been amended repeatedly, so current text should be confirmed before it is relied on, and how any provision applies to a particular order depends on that case’s facts.
- Texas Family Code §156.401 — Grounds for Modification of Child Support — the two general grounds, the agreed-order limitation in (a-1), the Title IV-D medical and dental provision in (a-2), and the settled circumstances in (c), (c-1) and (d).
- Texas Family Code §§156.402–156.405 — how the guidelines figure into the analysis, and the treatment of voluntary extra payments, a new spouse’s resources, and the receiving parent’s needs or standard of living.
- London v. London, 192 S.W.3d 6 (Tex. App.—Houston [14th Dist.] 2005, pet. denied) — independent authority on the historical-and-current comparison, and the strongest application of §156.403. Reversed and rendered against the modification. Rehearing overruled in 2006, which accounts for the conflicting dates in later citations.
- Trammell v. Trammell, 485 S.W.3d 571 (Tex. App.—Houston [1st Dist.] 2016) — affirmed a reduction where uncontroverted evidence established both sides of the comparison.
- In the Interest of A.M.W., C.E.W., III, and B.M.W., No. 05-08-01674-CV (Tex. App.—Dallas May 25, 2010) — explains that the relevant change need not be solely financial, and illustrates how changed custody or living arrangements may require reallocating support. The judgment modifying support was affirmed as modified.
- In the Interest of C.C.J. and C.M.J., Minor Children, No. 05-07-00216-CV (Tex. App.—Dallas Feb. 14, 2008) — opinion of the Fifth Court of Appeals applying the comparison requirement to child support. Decided under an earlier version of §156.401(a)(1).
- Texas Family Code §§154.182 and 154.1825 — cited here only as the sections §156.401(a-2) cross-references when it refers to required health care and dental care coverage.
Meet Kimberly P. Washington
Attorney Routing
Kimberly P. Washington
Senior Managing Attorney
Kimberly Washington has been with the Law Office of Bryan Fagan, PLLC since 2015 and provides senior legal leadership in Texas family-law matters, including divorce, child custody, and mediation. Whether a situation is the kind §156.401 recognizes — rather than simply a hard one — is one of the first questions a support modification raises.
Licensed by the State Bar of Texas since 2008 · Juris Doctor, Thurgood Marshall School of Law
Conclusion:
Understanding the Grounds for Child Support Modification in Texas means separating a significant life change from one the law recognizes. Before deciding what to do, identify the controlling order, the correct comparison date, and the particular change that may support an increase, reduction, or adjustment of medical or dental support.
In straightforward situations, the issue may be a documented income change or a guideline calculation that can be evaluated directly. In more complex cases, disputed earnings, self-employment, an agreed non-guideline order, incarceration, disability, or a change in where the child lives may require deeper legal and financial analysis. If your case involves more than one of these issues, working with an attorney suited to that level of complexity can help you avoid pursuing the wrong ground or requesting relief the evidence does not support.
The Law Office of Bryan Fagan, PLLC helps Texas families understand their orders, evaluate their options, and choose a strategy that protects what matters most. To discuss whether your circumstances may support a modification, call 281-810-9760 or schedule a free consultation. Clear information is often the first step toward regaining control and peace of mind.
About the Author
Bryan Fagan
Founder, Law Office of Bryan Fagan, PLLC
Texas Divorce & Family Law Attorney · Licensed in Texas Since 2012
Bryan Fagan founded the Law Office of Bryan Fagan, PLLC in 2012. His work includes Texas family-law strategy, firmwide leadership, team-based case planning, and client education designed to help families understand their legal options and make informed decisions.
Juris Doctor, South Texas College of Law, 2011 · Licensed by the State Bar of Texas May 4, 2012 · Bar No. 24080889
About the Law Office of Bryan Fagan, PLLC
The Law Office of Bryan Fagan, PLLC helps Texas families understand and navigate family-law issues involving divorce, child custody, possession and access, and related matters. Founded by Bryan Fagan in 2012, the firm combines legal representation with education designed to give families clearer information about their options and the decisions ahead.
Frequently Asked Questions
Under §156.401 there are two general grounds for changing the amount: a material and substantial change in the circumstances of the child or a person affected by the order, or three years having passed since the order was rendered or last modified together with a 20 percent or $100 difference from the guideline amount.
No. The statute supplies legal routes, not a checklist of events that qualify on sight. It defines no list and no set of factors. Chapter 156 settles a small number of specific circumstances — incarceration exceeding 180 days, release from incarceration where support was abated, and joint managing conservatorship — and leaves the rest to the comparison between the circumstances underlying the order and present circumstances.
No, not automatically. A change in earnings may be relevant to whether circumstances have materially and substantially changed, and it may affect what the guidelines would now produce, but the statute makes no income change a ground on its own.
Yes, but only on the change ground. Under §156.401(a-1) the court may modify the amount of such an order only on a showing that circumstances have materially and substantially changed since the order was rendered. The three-year ground is not available for it.
Two, and they work differently. The three-year route under §156.401(a)(2) does not require proving a material and substantial change, but it has its own two conditions: three years since the order was rendered or last modified, and a 20 percent or $100 difference from the guideline amount. Separately, §156.401(a-2) permits a Title IV-D order to be modified at any time, and without a showing of material and substantial change, to provide medical or dental support where the order does not provide the coverage required under §§154.182 or 154.1825.
No. Having a statutory ground does not guarantee modification. The ground must be established on the evidence, and §156.402 conditions its guideline-based analysis on the modification being in the best interest of the child.
