@moondancer wrote:
Can I file electronically using desktop Desktop Deluxe TT if I attach a statement? If so, how do I attach a statement? If not, can I file electronically using Form 3115?
No, you will have to print and mail the return unless you use Form 3115, but note that a separate copy needs to be signed and mailed to the IRS.
See https://www.irs.gov/instructions/i3115#en_US_202212_publink63215hd0e217
