Unfortunately, occasionally that happens, and you just have to provide them with the information they need indicating your HOR is some other state, and you had no MO-sourced income.
Some other states (CA in particular) have also been annoying out-of-state military personnel since they are all desperate for tax funds to keep them going. I have a family member who was stationed in CA, and has since PCS'd out, but still gets occasional CA tax "requests"....but only because they bought a car while stationed in CA and it's titled/licensed there.
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MO does have an online non-filing form for non-MO military people, who are currently posted to MO, that supposedly prevents a future inquiry...BUT...it is not to be used if you already have a MO tax inquiry. A current MO inquiry has to be handled separately.
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MO Military PERSONNEL tax brochure:
5735 - Tax Military Brochure (adobeconnect.com)
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MO non-resident Military "Online" No Return Required form. (I have no idea if it is needed during every tax filing season, while stationed in MO, or not):
Missouri Department of Revenue | Military No Return Required (mo.gov)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
