The Illinois Financial Affidavit is a form used in divorce proceedings in the state of Illinois to disclose the financial information of the parties involved. The affidavit is used to provide the court with a detailed overview of each party's income, assets, debts, and other financial information. It is required by the court to determine an equitable distribution of the marital property in a divorce. There are two types of Illinois Financial Affidavit. The first is a short form, which requires the parties to provide basic information about their finances. The second is a long form, which requires more detailed information, including an itemized list of all assets and liabilities.