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Now that we are actively starting to amend same-sex couples who have been legally married under federal law, some practical questions are coming up . . . namely if you amend 2010 (filing status MFJ), are you then required to amend 2011 and 2012 as well? Seems like the IRS wouldn't want us indiscriminately choosing which years to use the more advantageous filing status & leaving other years as is?? Also, any advice on how to create the 2010 amended return in ATX if the same-sex couple was not a previous client? Create a pro-forma 1040 return (MFJ) and Form 1040X separately, and file those with attached copies of the originally-filed 1040 returns from the clients?