If you reported Qualified Dividends or Capital Gains on your tax return, the tax tables are not used.
The Qualified Dividends and Capitals Gains Tax Worksheet is used instead - https://www.irs.gov/pub/irs-pdf/i1040gi.pdf#pag=37
Or the Schedule D Tax Worksheet - https://www.irs.gov/pub/irs-pdf/i1040sd.pdf#page=16
