You would not need to submit anything with the return for the Married Filing Joint classification. However, you will want to maintain record for proving a common law marriage exists.
It is not required to have the common law registered at the county clerk's office but you can file a common law marriage declaration as proof the common law exists.
Another form of proof would be maintaining records for tax years Married Filing Joint was claimed showing joint lease agreements, joint insurance policies, and joint bank accounts.
It is important to maintain a record for any year the status is claimed for documentation in case of an audit.
@dm888
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