In response to @Xuser , I ran test case using latest version of TT (3/3/22) where the income inputs from column (d) were divided by 4 (the first period scaling factor) and those scaled inputs were entered into 2021 Form 2210AI column (a) in the appropriate places. This resulted in the same values in TT Form 2210AI line 13 (a) and (d), and if TT had properly scaled the CG/QD income using a factor of 4, should give the same result in line 14 (a) and 14 (d). IT DID NOT. For this test case, TT line 14 (a) came out 10% (several thousand dollars) higher than line 14 (d). The Pub 505 calculation(s) for the same data matched 14 (d). Bottom line is that TT Form 2210 is not calculating 14 (a)-(c) correctly.
