To switch from filing Married Filing Jointly to Married Filing Separately (which must be done before the tax filing due date):
The person listed first on the original Married Filing Jointly federal return will need to file an amended federal return (1040X) and change their filing status to Married Filing Separately.
The person listed second will file their own original federal return filing Married Filing Separately. The secondary Taxpayer needn't file an amended return for this since it is as if they had never filed once the primary Taxpayer amends.
@mvftwtt
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