First you have to identify DOMICILE so that you can determine if you file a Resident of Nonresident Tax return for each state.
Proof of Georgia Residency | Department of Revenue
For Georgia:
Full-year residents are taxed on all income, except tax exempt income, regardless of the source or where derived. If one spouse is a resident and the other is a nonresident without any Georgia-source income, your Georgia return may be filed jointly or separately with each spouse claiming the appropriate exemptions and deductions.
For Wisconsin:
If you file a Joint Wisconsin return, all income must be reported, but only Wisconsin income is taxed.
If you are a Wisconsin nonresident, you can file a separate Wisconsin return (see How do I prepare a joint federal return and separate state) then you can claim the credit for the taxes paid to another jurisdiction in Georgia (as your resident state).
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