Illinois exempts all retirement income from taxation. For all years of data above, Connecticut taxed retirement income, including Social Security, for all filers earning more than $50,000 individually or $60,000 for joint filers. As a result of 2017 legislative changes, the exemption is being gradually expanded until 2025, when all retirement income will be exempt for individual taxpayers earning less than $75,000 or joint filers earning less than $100,000.