I have created a hypothetical for just the first column (Jan - Mar) on Form 2210 AI to show that Turbotax is not calculating the amount on line 14 correctly. This is the case for the 2d and 3d column as well.
Form 2210 AI
line 1 Gross income Jan-Mar $35,000
line 2 Annualization rate x4
Line 3 Annualized Gross Income $140,000
line 7 Annualized Std deduction $12,550
line 11 Annualized Taxable Income $127,450
Capital gains (not annualized) $ 2,000 Shown in Tax Computation worksheet box
Qualified dividends (not annualized) $ 200 Shown in Tax Computation worksheet box
Correct Line 14 Tax calculation
Gross income (annualized) $127,450 Tax
Capital gains (annualized) $2,000 x 4 $ 8,000 x 15% $ 1,200
Qualified dividends (annualized) $200 x 4 $ 800 x 15% $ 120
Income subject to regular tax(annualized) $118,650 x 24% less $$5,979 $22,497
Total $23,817
Tax calculated by Turbotax (updated 3/12/22) $24,357
Turbotax Line 14 Tax calculation
Gross income (annualized) $127,450 Tax
Capital gains ( not annualized) $2,000 $ 2,000 x 15% $ 300
Qualified dividends (annualized) $200 x 4 $ 800 x 15% $ 120
Income subject to regular tax $124,650 x 24% less $$5,979 $23,937
Total $24,357
Difference $540
Difference Equal to difference in annualizing capital gains $6,000 times difference in
regular tax rate (24%) vs capital gains tax rate (15%) 9% = $5
