Condominiums associations are considered corporations in the eyes of the IRS. As such, they are required to file an annual tax return (either an 1120 or 1120-H).

Condo associations showing taxable income on their federal returns are also required to file an IL-1120 with the state of Illinois.

Tax returns must be postmarked by April 16th this year. The IRS granted an extra month to file beginning with the 2016 tax year.