if you want change from MFS to file MFJ then the spouse that already filed should amend their return to include your income and withholding etc.
Then you will not have to file anything.
IRS was not allowing e-File of 1040-X when you go to change filing status but it appears they are relaxing these restrictions.
It may work now.
the processing time is the same for 1040-X whether e-File or paper, according to IRS.
Advantage of e-File is
-- it can't get lost in the mail.
-- you can't leave out required forms or schedules.
@cparke3
