Illinois How to Complete a Financial affidavit (Family & Divorce Cases) is a legal document used to provide financial information to the court during a divorce or family law proceedings. It is used to disclose a party's income, expenses, assets, and liabilities. The Illinois Financial Affidavit is a form that must be completed and signed by both parties to the divorce or family law case. The form requires a detailed account of each party's financial situation, including their income, expenses, assets, and liabilities. There are two types of Illinois Financial Affidavits: Short Form and Long Form. The Short Form is a simpler, shorter version of the affidavit that does not require as much detail. The Long Form requires more detail and is typically used when the parties have complex financial issues. Both forms must be signed and notarized.