Patricia Harmon
Harmon Family Law
- City
- Dallas
Family Law · Sub-Practice
Child support is calculated by formula — but modifying, enforcing, and navigating it requires an attorney.
§ Overview
Child support is a legal obligation to financially support your child after separation or divorce. It is calculated by a state formula — but understanding, challenging, and modifying that formula requires experienced legal guidance.
Every state has a child support formula that considers both parents' incomes, the amount of parenting time each parent has, health insurance costs, daycare costs, and sometimes the child's special needs. The formula produces a "guideline" amount that courts use as the starting point. Judges can deviate from the guideline if a parent can show that the standard amount would be unjust or inappropriate in a specific case. Support can be modified when there is a substantial change in circumstances — a job loss, income increase, change in parenting time, or change in the child's needs.
⚡ § Key issues & stakes
✅ § Your options & strategies
“One of the most common mistakes parents make is waiting too long to file for modification after a major life change — job loss, significant income reduction, or a substantial change in parenting time. Child support modifications are not retroactive: courts typically modify support only from the date a petition is filed, not from the date circumstances changed. File promptly, even if you're not sure the modification will be granted.”
§ What to look for in an attorney
§ Ask these at your consultation
Questions that matter
§ FAQ
How is child support calculated?
Most states use an "income shares" model that considers both parents' gross incomes and the amount of time the child spends with each parent. A few states use a "percentage of income" model based only on the paying parent's income. Both produce a guideline amount that courts use as the starting point, with deviation possible for documented reasons.
Can I reduce my support obligation if I spend more time with my child?
Yes. In most states, the amount of parenting time directly affects the support calculation. If your actual parenting time substantially increases beyond what the order reflects, you can petition for a modification based on the changed schedule.
Does child support cover college expenses?
Depends on the state. Some states (New Jersey, New York, Connecticut, Massachusetts, and others) allow courts to order college contribution as a form of extended support. Others terminate support at 18 or high school graduation. Review your state's law and your existing agreement carefully.
What if I cannot afford to pay the ordered amount?
Do not simply stop paying — you will accumulate arrears with interest and risk contempt proceedings. Instead, file a modification petition immediately documenting the change in circumstances. Courts can reduce the ongoing obligation, but they cannot reduce arrears that have already accumulated.
§ Counsel
Harmon Family Law
Brennan Family Law
Johnson Real Estate Law
Howard Family Law Center

Andersen Family Legal
§ Related practice areas
We use cookies to improve your experience and analyze site traffic. By continuing to use this site, you agree to our Privacy Policy.