HAHAHAHA! I jinxed myself. I got a new 1099-R today. I didn't recognize the payer at first , and thought maybe it was for someone else, but nope, my name as last 4 of my SSN. Next thought was that someone hacked a retirement account and took some money out.
Finally I recognized the payer as Mass Mutual. I bought an SPIA from them this year, funded from my Roth. Since there are no tax implications, it never made my tax spreadsheet. The monthly payments show up in line 1, and box 7 code T indicate a Roth IRA distribution.
I haven't run it thru TT, but I imagine 1040 line 4a increase by box 1, but 4b does not so there is no change to any other numbers. I don't think I'll even file a 1099-X unless I get a letter from the IRS on it. They may figure out line 4a doesn't equal the total of my 1099-Rs, and if they don't catch the code T they may count it as regular income that I failed to report.
Lesson learned, I will wait until at least a few days after the end of January each year to see if anything forgotten like this shows up.
Go ahead, tell me "I toldja so!", I deserve it.