Examine your state's child support calculator. These are usually available on state child support websites or on family law attorney's websites. The questions the calculator offers you are the factors that are considered in child support awards. They usually include parental income and child's expenses. If your income has been reduced or if the expenses for the child are increased, you may be able to modify your child support. If a child emancipates or is adopted, you might be able to change your financial contribution for child support.
File a motion to modify child support. This motion should be filed in the same court that issued your original child support order. In many states, the clerk of the court can provide you with a blank modification form to fill out. You can also draft one on your own, or with the assistance of your attorney. The motion should make clear the reason you wish to reduce your payments, and the amount to which you want to reduce them. Return the motion to the clerk and pay the filing fee. The clerk will schedule a hearing on the motion. Depending upon your state's court rules, you may need to serve the other parent with a copy of the motion or complete a request to have the sheriff serve the other parent.
Attend the hearing on the motion. You must submit evidence that your reason for changing child support is valid. This may include pay stubs to prove that your income has been reduced, orders emancipating a child, receipts for a child's medical bills or other evidence indicating a change. You may also call witnesses who can testify to the facts. Your former spouse will also have an opportunity to present his side and provide evidence. After the judge has heard evidence, she will rule on the motion and will issue an order that states the amount of child support you should pay.