Yes---you can amend your joint return to a MFS for ONE of you, but when you file MFS there are two tax returns ---one for each spouse. So one of you uses the joint return and amends to MFS and the other has to start a new original MFS return. Follow all the rules----if one of you itemizes deductions, the other spouse must also itemize. Or you both have to use standard deduction.
You must amend before the April 15 filing deadline---after April 15 you are not allowed to amend from filing a joint return to filing separate returns.
HOW TO AMEND FROM MFJ TO MFS OR FROM MFS TO MFJ
https://ttlc.intuit.com/turbotax-support/en-us/help-article/small-business-processes/switch-filing-j...
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