Good afternoon. Actually, what you need to do is to file amended returns for last year for both your Federal return and your Illinois state return. You will then receive refunds. You are not allowed to correct it on a later year's return.
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No...the additional taxes you paid last year due to the amended returns would not be deductible on this year's return....just as any tax you paid last year are not deductions on this year's return. I'm sorry!