Synopsis As Introduced Proposes to amend the Revenue Article of the Illinois Constitution. Authorizes a tax on or measured by income to be at a graduated rate (now, all taxes on or measured by income shall be at a non-graduated rate). Provides that, in any such tax imposed upon corporations, the rate shall not exceed the highest rate imposed on individuals by more than a ratio of 8 to 5. Deletes provisions limiting to one the number of income taxes for State purposes imposed on corporations. Effective upon being declared adopted.