A couple that files Married Filing Jointly (MFJ) on their federal return files as Married Filing Combined (MFC) Missouri. Missouri generally requires the same filing status used on the federal return. MO Dept of Revenue - Residents and Nonresidents with Other State Income
If a joint federal return is filed, and one spouse is a full-year resident while the other is a part-year resident or nonresident, taxpayers may elect to file MFS in Illinois. Do not recompute any items on the federal return. Instead divide each item of income and deduction shown on the joint federal return between the separate Illinois returns following the Allocation Worksheet in the instructions. If a MFJ Illinois return is filed, both spouses are treated as residents. This election is irrevocable for the tax year. Credit is allowed for income tax paid to another state. IL Dept of Revenue
@patepr01 - If using the desktop software, you can create mock returns to see what is best for you and your spouse's best option.
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