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State tax filing
It depends, there are some situations where the form instructs to attach some parts of the federal return. See the image below of the 2023 Form IL-1040, see line 5, it asks to have page one of federal return attached. It could be possible that only one of you have an amount in a line that requires a copy of the federal return and the others do not.
March 19, 2024
6:25 PM