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If both parents are in agreement to change the amount of child support, the procedure is outlined in Rule 412 of the Mass. Supplemental Rules of the Probate and Family Court.
These forms must be filed:
The above forms must be file together as a “complete packet.” If necessary forms are missing, it will delay action by the court.
Find the Probate and Family Court where your case was originally heard.
If you and the defendant live in this state but in different counties, you must file in the county where your case was originally heard. For example, if you were in Norfolk County when support was first ordered, but you now live in Suffolk County, and the defendant in Plymouth County, you must file in Norfolk Probate and Family Court.
If the other party lives in a different state, the Uniform Interstate Family Support Act applies. This act allows the parent who has custody to request or modify child support from a parent in another state without having to necessarily travel to that state. Ask court staff for more information if you're in this situation.