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.
20 14 - 20 15. Illinois has two marginal tax brackets, ranging from 5.00% (the lowest Illinois tax bracket) to 5.00% (the highest Illinois tax bracket). Each marginal rate only applies to earnings within the applicable marginal tax bracket, which are the same in Illinois for single filers and couples filing jointly.