He would be a resident of Maryland if he was in Nebraska temporarily, meaning he intended to return to Maryland. If so, he would file a resident return in Maryland and file as a non-resident in Nebraska. If he ends up with a tax for Nebraska, look for a credit for taxes paid to another state on his Maryland return to get a credit for all or a portion of those taxes on his Maryland return.
[Edited 3/12/25 @11:14 AM]
@mkak1103
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