IRS Qualified Dividends and Capital Gain Tax Worksheet—Line 16 on 1040 instructions page 37
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
And you might need IRS Tax Table page 15 to calculate the tax and to compare to Turbo Tax. That isn't shown in Turbo Tax.
https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
