Article I of the United States Constitution created and empowered our legislative branch of government. The United States Congress leads the legislative branch. Congress includes both the House of Representatives and the Senate. Generally speaking, Congress makes our laws.
Income Tax returns and schedules. The Illinois Business Income Tax rate for tax years. ending on or after December 31, 2015, is 5.25 percent. (.0525) for taxpayers taxed as corporations, and 3.75. percent (.0375) for taxpayers taxed as trusts or estates. The instructions for overpayments to be carried forward.
Illinois' income tax is imposed on every individual, corporation, trust and estate earning or receiving income in the state. The tax is a flat percentage of a taxpayer's federal adjusted gross income. More on Illinois taxes can be found in the tabbed pages below. 1  Income.