Texas Child Support Modification

Texas courts do not modify child support simply because one parent asks. You must meet at least one of two qualifying grounds before the court will even consider your petition.

Ground 1: Material and Substantial Change in Circumstances

A material and substantial change requires more work to prove than the three-year rule, but it is the only pathway available if your order is less than three years old. Courts evaluate whether something significant has changed in the life of the child, either parent, or another person the order affects since the original order was signed.

Common examples that qualify include:

• Significant income change: a meaningful increase or decrease in either parent’s earnings, including job loss or a major promotion
• Change in custody or possession: if the child is now living with the other parent more frequently, the support obligation may need to reflect that reality
• New legal obligations: when the paying parent has additional children they have a legal duty to support. The obligation does not need to be court-ordered; having a child creates a duty to support that child, and courts factor that in.
• Change in the child’s medical or educational needs: ongoing expenses that did not exist when the original order was entered
• Incarceration: Texas Family Code § 156.401(c-1) specifically classifies incarceration exceeding 180 days as a material and substantial change of circumstances
• Activation for military duty: deployment or activation that affects income or the ability to pay.

The change does not automatically modify anything. You still have to petition the court and prove the change exists.

Ground 2: The Three-Year Rule

Texas law also provides a time-based pathway. If three years have passed since your order was last signed or modified, and the current guidelines would produce a monthly amount that differs from your existing order by either 20 percent or $100, you qualify to modify without proving any change in circumstances. This is Tex. Fam. Code § 156.401(a)(2) in practice, and it is the most frequently used pathway.

This pathway matters more now than it did even a year ago. As of September 1, 2025, Texas raised the monthly net resource cap used to calculate guideline support from $9,200 to $11,700 under Texas House Bill 2643 ^[2]. If you or the other parent earns more than the previous cap, and three years have passed since your last order, this change may give you grounds to pursue a modification.

How Texas Calculates Child Support

Texas uses a percentage-of-income model, applying guideline percentages to the paying parent’s monthly net resources up to the statutory cap. The current guideline percentages are:

• One child: 20% of monthly net resources
• Two children: 25%
• Three children: 30%
• Four children: 35%
• Five or more children: 40%

These percentages are applied to net resources, which are calculated under Tex. Fam. Code § 154.062 ^[3] and account for taxes, social security, and other required deductions from gross income. Courts can deviate from the guidelines when circumstances warrant a different amount, but the burden is on the requesting party to justify that deviation.

Strategic planning around the net resources calculation is where legal representation pays off. Our firm regularly works through the specific statutory factors and potential deviations with clients before any petition is filed. Use our Texas child support calculator to get a preliminary estimate, then schedule a consultation to understand how your specific financial picture affects the outcome.

The Child Support Modification Process in Texas

A modification follows a structured court process. Skipping steps or filing incorrectly can delay your case or cost you leverage. Here is what the process looks like from start to finish.

1. Evaluate your grounds. Before filing anything, confirm you meet at least one of the two qualifying standards above. Document the change in circumstances with records: pay stubs, tax returns, medical bills, school expenses, or custody schedules.
2. File the Petition to Modify the Parent-Child Relationship. This is the formal legal document that tells the court what you are asking to change and why. It must be filed in the county where the original order was entered. For most clients, that means Collin County District Court or Denton County District Court.
3. Serve the other parent. The other parent must be legally notified of the modification suit. Service is typically completed by a constable, sheriff, or private process server.
4. Attend mediation if required. Courts encourage mediation before contested modification hearings. A neutral mediator helps both parties reach an agreement without a full trial. If mediation succeeds, the agreed terms are submitted to the court as a proposed order.
5. Present your case at the hearing. If the parties cannot agree, the case proceeds to a hearing before the judge. Both sides present financial evidence and argue their position. The judge decides based on the child’s best interests and the applicable legal standards.
6. Receive the new order. The new child support amount takes effect on the date the judge signs the order. While the statute technically permits the court to make a modification retroactive to the date the petition was filed, that outcome is rare in practice. Do not rely on a retroactive start date as part of your financial planning.

The Texas Attorney General’s Office offers an administrative modification pathway for parents with open Title IV-D cases, but that process is slower and provides less control over the outcome. For most parents in Collin County or Denton County, filing directly with the district court with legal representation gives you the best combination of speed and strategic positioning.

What the Court Considers When Modifying Child Support

Texas courts do not simply recalculate the math and issue a new number. The judge evaluates the modification through the lens of the child’s best interests, which means your financial documentation is only part of the picture.

Courts consider factors including:

• Each parent’s current income, earning capacity, and net resources
• The child’s current needs: healthcare, education, extracurricular activities, and daily living expenses
• Whether either parent has new support obligations for other children
• Changes in the cost of health insurance or medical expenses
• Any shifts in the actual custody arrangement or possession schedule

If the modification request involves both child support and custody changes, those matters are evaluated together and can affect each other. A parent who gains additional possession time, for example, may see a corresponding change in the support obligation. Our team plans for these intersections strategically before filing.

How The Ramage Law Group Approaches Child Support Modification

A modification case that looks straightforward on the surface can turn complicated quickly. Income disputes, undisclosed financial changes, new custody arrangements, and complex net resource calculations all create openings that an unprepared party will not see until it is too late.

Our approach is to think many moves ahead before we file. That means analyzing whether you are better positioned through the material-change pathway or the three-year rule. It means reviewing the other parent’s reported income against the full statutory definition of net resources. And it means anticipating counterarguments before they get raised.

We work with parents across Collin County, Denton County, and Dallas County, including McKinney, Frisco, Plano, and Allen. When financial circumstances have genuinely changed, our team builds the documented case that gives that change legal weight.