it is retroactive from the date filed. you need to get your paperwork in order and make sure you can show increased need if you are filing for an upward modification. further if you can afford an attorney you should get one.
I will allways give you a free consultation, so we can discuss all the facts of your case call us anytime at 718-263-6800
Unless there is a good reason and BOTH parties agree, any modification will be retroactive to the date of the first filing requesting it. Good luck!
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If your ex-husband's petition for downward modification is granted, it would only be retroactive to the date of filing his petition, rather than yours. If your ex-husband is continuing to pay support at the current (higher) rate, and the petition for downward modfication is granted, then your ex-husband would likely be entitled to a credit for the payments made at the higher rate. The parties can also agree (consent) to waive the difference if the petition for downward modification is granted. You should speak with a family law attorney in your area for further information.