Thanks @MonikaK1
To clarify: We have already e-filed our federal taxes as "MFJ", but since we both live in separate states, are planning to paper file our state taxes as "MFS". Last year, turbotax did not instruct me to attach my federal returns, but has specifically asked me to do so this year. So my question is - is it mandatory to attach the federal return this year? And if yes, would there be any issues if I attach my federal returns filed as MFJ?
