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I did 1099 NEC for Federal but I did not do State.  I already submitted the file to IRS.  How do I file one for state? I am filing one for my son who lives in Chicago (I am from Texas so I am not used to doing a State filing).   I completed the 1099 NEC for federal and mailed.  How do I file one for State of Illinois without redoing the Federal one.  I