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.
Illinois income tax is levied at a flat 3% rate regardless of income level. A deduction of $2,000 is allowed for each exemption claimed on your federal return. You can also receive an additional $1,000 exemption if you or your spouse is 65 or older, legally blind, or both.
Statutory Reference. 35 ILCS 5/101 to 5/1701. Definition. The Illinois Income Tax is imposed on every partnership earning or receiving income in Illinois. The tax is calculated by multiplying net income by a flat rate. The Illinois Income Tax is based, to a large extent, on the federal income tax code.