01.Illinois has a state estate tax — with an exemption around $4 million.
Illinois is one of about a dozen states that still levy a separate estate tax, and its exemption (approximately $4M) is much lower than the federal threshold (~$13.99M in 2025). For families with a paid-off Chicago-area home plus retirement savings, the IL estate tax is a real planning consideration — graduated rates can reach into the double digits at higher brackets.