The new New York Domestic Relations law contains a provision allowing a court to modify an order of support, including an order incorporated without being merged into a divorce decree, upon the showing of a substantial change in circumstances, if three years have passed since the order was entered or last modified, or if either party's gross income has changed by more than 15% since the last modification or entry of the order.

There are some twists and turns to the law, including some exclusions, so you'd do well to discuss your situation with a local family attorney.