If I'm going to include form 8606 which I already filed last year as supporting doc with my 1040x, what sign date should I use? Is it the date I filed last year or the date I file the 1040X this year?
Also for the return address, the IRS letter provides one address in Atlanta for inquires and one address in Kansas City for payments. Since I do not have any payment, which address should I use? I can see the letter is sent from Atlanta.
