File RI Form RI-1040MU
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Form RI-1040MU is the form needed by Rhode Island residents who work in another state to avoid dual taxation on income earned in other states. Rhode Island residents who work in another state will be taxed on income earned in other states by both Rhode Island (the state of residency) and the other state (where the income was earned). Form RI-1040MU is a supplemental form that should be filed with the Form RI-1040 Booklet.