Child support orders cannot be changed on a whim or because a court thinks that “it is time.” It must be based on evidence proving that there is good reason to make the change. This usually requires that a person who wants to make the change show a changed circumstance. You must show that the facts that existed when the last order was entered have changed. (In the many years a child support order is in place, the parent’s circumstances may change many times.) For example, in Maryland, if one parent’s income has changed (either gone up or down) by at least 25%, this is considered a big enough change to require a change in the support order. You can request a modification for a lesser change in income, but will not necessarily be guaranteed a change in the support order.