How to Modify Child Support in Texas: Filing Steps and Effective Date
To modify Texas child support, file a suit or motion to modify and serve the other party. A change reaches only obligations accruing after service or appearance, so serve as soon as your circumstances change.
How do you modify child support in Texas?
- Run the guideline amount in the Texas child support calculator and test it in the modification calculator.
- File a suit or motion to modify in the court that has continuing jurisdiction over the order, or ask the Office of the Attorney General if it is enforcing your case.
- Serve the other party, or make sure they make an appearance in the suit.
- Show your ground: a material and substantial change, or three years and a 20% or $100 gap (156.401(a)).
- Keep paying the existing order until the court changes it.
Why does service matter in Texas?
Because the order may be modified as to the amount of support only for obligations accruing after the earlier of the date of service of citation or an appearance in the suit to modify (156.401(b)). A change in January and service in July leaves six months at the old amount.
Can I add medical support in Texas?
Yes. In a Title IV-D case the order may be modified at any time, without a material and substantial change, to provide medical or dental support if the order does not provide required coverage (156.401(a-2)).
Who receives support if the child lives with someone else?
On motion, the court shall modify the order so the person who has had physical possession of the child for at least six months can receive and spend the support, if the conservator with the exclusive right to decide the child’s primary residence voluntarily relinquished the child, was or will be incarcerated for at least 90 days, or relinquished the child in a child-protection case (156.409).
Do the Texas guidelines apply?
The guidelines are used to compare the amounts: the three-year route asks how far the order is from the guideline amount. Bring pay stubs, tax returns and proof of health insurance premiums.
What about the other Texas conservatorship terms?
Joint conservatorship by itself is not grounds to change support (156.401(c)), so ask for the support change directly rather than relying on a custody order.
Can a Texas agreement change support without a court?
A court order stays in force until a court changes it. Ask the court to approve any agreed change so the amount you pay and the amount of arrears are not left in doubt.
Can I use the guidelines even if I do not qualify on the numbers?
The court may consider the guidelines to decide whether a material or substantial change warrants modification (156.402(a)). Bring the worksheet with your petition.
Who is affected by the order and can file?
The statute speaks of the circumstances of the child or a person affected by the order (156.401(a)(1)), so either parent can sue; others with a stake may need to ask a licensed Texas attorney whether they have standing.
How much does a late filing cost? An example
If you serve 3, 6 or 9 months after your change, the relief you lose at a $300 monthly difference is:
| Delay before service | Relief lost |
|---|---|
| 3 months | $900 |
| 6 months | $1,800 |
| 9 months | $2,700 |
What happens to unpaid support while the case is pending?
It stays owed as a judgment. See whether Texas arrears expire or can be forgiven and add up your balance.
Frequently asked questions
How do I modify child support in Texas?
File a suit or motion to modify, serve the other party and show a ground under Family Code 156.401.
What is the effective date of a Texas modification?
Obligations accruing after the earlier of service of citation or an appearance in the suit.
Can I add medical support to a Texas order?
In a state-enforced case, yes, at any time and without a material change.
Does a Texas custody change modify support automatically?
No. Joint conservatorship by itself is not grounds.
Does a Texas modification stop income withholding?
Not until the court enters the new order.
Official sources
- Tex. Fam. Code 156.401: grounds for modification
- Tex. Fam. Code 156.402: effect of guidelines
- Tex. Fam. Code 157.263: confirmation of arrearages
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due
- 45 CFR 302.56: federal guideline requirements
A local family law attorney can review your situation — many offer a free consultation.
This is general information, not legal advice. It is based on the cited Texas statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Texas attorney.