I know that you can request financial records including tax records, for I believe the last year. But I do not believe there is a way to show income if he does not file that income with the IRS. We looked into this due to my husband’s ex working for her mother and getting paid in cash for working full time but filing hours for part time. If there is no paper trail, there is no way to prove it in court. [V]
My husband also owns his own business but he gets a salary and a W-2 just like his employees do. The child support he pays is based on his actual income and not on the company records.