It depends. The key is whether or not you itemize deductions on your Federal return. If you claim the standard deduction on your Federal Return, the answer is no, because you are not deducting the Illinois property tax on your Federal return, so you do not need to enter them back in.
If you itemize, you probably will have to enter in at least some of the property taxes, and because of the changes in the Tax Cuts and Jobs Act, there would be a complicated formula to determine how much. If you did itemize, feel free to comment approximates on your filing status, the amount of itemized deductions you are claiming, and the amount of state and real estate taxes you are claiming as deductions to give you a more accurate picture of what you may have to add back.
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