You can just download a blank motion form from the Colorado Judicial Branch website domestic forms section and fill out the reasons that you feel that the monthly arrears payment is too high and you need to have it reduced. Remember, it was set at that high level for some reason at some time, so you need to be prepared to argue that it is no longer fair and equitable based on changed circumstances.
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The total amount of child support arrears cannot be changed. Past child support is a final judgment. However, you may be able to adjust the payments.
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Child support is based upon your current gross income, the other party's gross income, expenses paid for the child including but not limited to health insurance, day care, extraordinary expenses, and also on the number of overnights held by each party. You can run the child support by keying these numbers into a worksheet. If your support would decrease by at least 10%, then you can file a motion to modify.
I have attached a link below for the child support guidelines.
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