Illinois Form Il-1120 - Web if this return is not for calendar year 2023, enter your fiscal tax year here. Corporation income and replacement tax return: Web illinois department of revenue. Enter the amount you are paying. Small business corporation replacement tax.
Corporation income and replacement tax return: Web illinois department of revenue. Web if this return is not for calendar year 2023, enter your fiscal tax year here. Enter the amount you are paying. Small business corporation replacement tax.