File Illinois Schedule 4255
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Schedule 4255 may be completed if you claimed an investment credit against your earnings or replacement tax liability in a preceding year. You must recapture any such investment credit the same year in which the property became disqualified. Illinois Schedule 4255 must be attached to IL-1040, IL-1065, IL-1120, IL-1041, IL-1120-ST, IL-990-T, or IL-1023-C.