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I agree with @kevinandlori  that the problem with line 14 (a)-(c) is related to how TT Form 2210AI scales (QD) and doesn't scale (CG) factors to calculate the impact of CG/QD.  This is wrong and not consistent with IRS Pub 505 which would scale both.  I repeated my test cases with what should be the same scaled income in both columns (a) and (d) putting all of the scaled CG/QD for column (a) in one or the other categories.  If all the CG/QD was entered as CG, 14 (a) was about 20% higher than 14 (d), whereas if all of CG/QD was input as QD, the results for 14 (a) and 14 (d) matched.  Bottom line, TT lack of scaling for CG in calculating 14 (a)-(c) is wrong and not consistent with IRS Form 505, worksheet 2-8 requirements which says both are to be scaled.  Fix your program TT.