You can't. You can use their income as it was when the last support order was calculated. That figure will be included in whatever child support order or judgment currently governs your case. But if their income has changed since that time, that number will be inaccurate. You should only file for modification of support if you have good cause to believe that the other parent's income has changed such that the modification will be favorable to you.
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You can't get it until after you file. I strongly suggest you first calculate support based on several different incomes for other person. Keep in mind that once you start the process you can't stop it. Be sure the support will go down before you file.
Be sure to designate "best answer." If you live in Oregon, you may call me for more detailed advice, 503-650-9662. Please be aware that each answer on this website is based upon the facts, or lack thereof, provided in the question. To be sure you get complete and comprehensive answers, based upon the totality of your situation, contact a local attorney who specializes in the area of law that involves your legal problem. Diane L. Gruber has been practicing law in Oregon for 26 years, specializing in family law, bankruptcy, estate planning and probate. Note: Diane L. Gruber does not represent you until a written fee agreement has been signed by you and Diane L. Gruber, and the fee listed in the agreement has been paid.