Marital status is decided based on a person’s marital status on December 31. If a couple is married on December 31 of the tax year; that couple may file a joint return for the year, regardless of when in the year they got married. Consequently, you can file Married Filing Jointly if you and your spouse meet any one of the following tests:
• You are married and living together as husband and wife, on the last day of the tax year.
• You are married on the last day of the tax year and living apart, but are not legally separated under a decree of divorce or separate maintenance.
• Your spouse died during the year and you did not remarry during the year.
• You are living together in a common law union that is recognized by the state where you live, or in the state where the common law union began. Read more