Texas Child Support Calculator 2026

Texas Percentage of Income Formula Explained

The Percentage of Income is the official method used by Texas courts to calculate child support obligations. Under this model, the non-custodial parent's net monthly income is multiplied by a state-prescribed percentage that varies by the number of children. For one child, Texas uses approximately 20% of net income as the base rate. For two children the percentage increases to 28%, for three children it is 34%, and for four or more children the rate continues to rise to reflect the greater financial need of larger families.

Net income is generally defined as gross income minus mandatory deductions such as federal and state taxes, Social Security, Medicare, and any existing court-ordered child support for other children. The Texas OAG CSD publishes the official support schedule that courts use to look up the exact dollar amount based on combined parental income. This online calculator applies the percentage-of-income approximation, which is accurate for a majority of income ranges but may differ slightly from the official schedule at very low or very high income levels.

Health insurance premiums paid for the child and work-related childcare costs are added to the base obligation and split between parents. This calculator adds 50% of these shared costs to the non-custodial parent's obligation as an estimate of their proportionate share.

How Texas Handles Shared Parenting

When the non-custodial parent has substantial overnight parenting time, Texas courts may apply a shared parenting adjustment to the base child support obligation. If the non-custodial parent has the child for more than 25% of the year (more than approximately 91 nights), many states allow a reduction in the support amount to reflect the additional direct costs the non-custodial parent is bearing during their parenting time.

This calculator applies a proportional reduction when overnight days exceed 91 per year (25%). The reduction is calculated as the excess overnight percentage multiplied against the base obligation. For example, if the non-custodial parent has 146 nights (40%), the calculation uses a reduction factor to reflect the shared costs. The exact method used in Texas courts may differ — some states use a cross-credit model or a specific statutory formula — so this estimate is directionally correct but should be confirmed with the Texas OAG CSD guidelines or a family law attorney.

Courts always retain discretion to deviate from the guideline amount when shared parenting time, special needs of the child, or other compelling circumstances warrant a different award. A parenting plan that clearly specifies overnight counts can help both parents understand the likely support range before going to court.

Modifying Texas Child Support Orders

Child support orders in Texas are not permanent. Either parent can petition the court for a modification when there has been a substantial change in circumstances. Common grounds for modification include a significant increase or decrease in either parent's income, loss of employment, a change in the child's medical needs or educational expenses, a change in custody or parenting time arrangements, or the child reaching the age of majority.

In most states, including Texas, parents can also request a review of their child support order every three years even without demonstrating a change in circumstances. The Texas OAG CSD can assist with the administrative review process. If both parents agree to a new amount, they can submit a stipulated modification to the court, which is generally approved quickly. If they disagree, a hearing will be scheduled where a judge reviews the current incomes and circumstances against the current guidelines schedule.

It is important to continue paying the existing court-ordered amount until a formal modification is approved — paying less than the ordered amount creates arrears even if circumstances have changed. Always file promptly if your income drops significantly. Last updated: 2026.