How do we correct our filing status?

I am a full year Illinois resident and my spouse is a part-year or nonresident, and we filed our original return as married filing jointly.  How do we correct our filing status?

You will need to file two amended returns.  You must file one for each spouse separating their income, exemptions, and credits.  To support their filing status, the nonresident or part-year resident spouse will need to complete and attach Schedule NR to their Form IL-1040-X.  The change must be made by the extended due date.

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