The Illinois Financial Affidavit is a form used by the court to assess the financial situations of both parties in a divorce. It is a sworn statement of each party's income, expenses, assets, and liabilities. The Financial Affidavit must be filed and signed by both parties in the divorce before the final hearing. There are two types of Illinois Financial Affidavits. The first is the Joint Simplified Financial Affidavit, which is used by couples where the incomes and assets of both parties are relatively similar. The second is the Detailed Financial Affidavit, which is used by couples with more complex financial situations. It requires a more detailed report of income, expenses, assets, and liabilities.