Probably the TTX calc.
You are likely just using the tax tables....but the tax tables alone aren't used if you had any $$ in boxes 1a,1b, or 2a of a 1099-DIV form, or any other long-term capital gains on brokerage transactions. Special calcs. are used since those other types of income are taxed at lower rates,or not at all..
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
