Judges hear all the time "Well, I earned that much before, but am not going to earn that much this year." They don't believe it until they see it, as folks have trouble living on less money when more money remains available. Regular overtime is part of gross earnings, and if you typically earned it in the past, judges will include it. However, if overtime really is no longer available, or if you are no longer working it to spend more time with your children, just wait three months or so until you have a very clear reduced earnings history and then bring a motion to modify based on changed circumstances. Make sure you run through the math carefully in advance, though, as oftentimes the reduced income doesn't actually change the amount of child support to be paid (depending on former spouse's income, and presumptive maximums). You would do well to consult with an attorney before filing any motion.
Responses are for general information purposes only, and are based on the extremely limited facts given. A consultation with an attorney experienced in the area of law(s) indicated in the question is highly recommended. Information and advice given here should not be relied upon for any final action or decision, as the information is limited by its nature to the question asked and the fact(s) presented in that question. THIS RESPONSE DOES NOT CREATE AN ATTORNEY/CLIENT RELATIONSHIP, particularly considering that the names of the parties are unknown.
A Motion to Modify Child Support, substantiated by hard evidence that there has been a change in your financial circumstances, would have to be filed with the court. An updated Financial Disclosure Form, depicting your current budget, coupled with ample supporting documentary evidence reflecting that you do not earn overtime, would also be required to have a realistic chance of having your current child support amount changed. Feel free to contact my office to schedule a consultation.
Nothing in this response to your posting on AVVO is intended or should be considered as legal advice to your specific situation. Our posting is intended to provide general information of interest to the public. Facts relevant to your situation and not disclosed in your posting may affect your specific legal rights and remedies.
If your income changed by 20% or more, you have a much better chance of getting the amount of child support altered. You should definitely consult with an attorney to help you figure this out because even if you are below the 20% threshold, there are other things a crafty attorney can use to get the award changed. Call an attorney now.