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I have manually entered Form 2210AI, Line 1 columns a, b, and c.  Line 7, does not include amount from 1040, Line 12b. as per the instructions. I override Line 7, and enter my Qualified Dividends on Line E, columns a, b, and c. The tax calculation for Line 14, column a, calculates accurately from the tables. But columns b and c just repeat the number from column a.  I override columns b and c with for amounts from the tables.