Taxpayers live in a state (Missouri) that does NOT recognize common law marriage unless they were common law residents of a common law state and moves into the not-recognized state. Taxpayers visited a common law state (Colorado) and in a park declared they were married before returning to the not-recognized state. Taxpayers want to file a married filing joint federal income tax return. My review concluded they do not qualify to file a joint return as they are not considered married in their resident state. And you say??
Ref:
Publication 17 (2015), Your Federal Income Tax www.irs.gov/publications/p17/ch02.html
Married persons. If you are considered married, you and your spouse can file a joint return or separate returns.
Considered married. You are considered married for the whole year if, on the last day of your tax year, you and your spouse meet any one of the following tests.
You are married and living together.
You are living together in a common law marriage recognized in the state where you now live or in the state where the common law marriage began.
You are married and living apart, but not legally separated under a decree of divorce or separate maintenance.
You are separated under an interlocutory (not final) decree of divorce.