Cross checked my 2019 tax liability per Turbo Tax with the IRS Tax Tables and there is a discrepancy. Why? Filing on 1040-SR

[DoninGA]

If you entered any qualified dividends or capital gains on your tax return then the taxes are not calculated using the Tax Tables.  The taxes are calculated using the Qualified Dividends and Capital Gains Worksheet.

Go to the IRS Form 1040 instructions for the QDCG Worksheet, page 33 - https://www.irs.gov/pub/irs-pdf/i1040gi.pdf#page=33

[fanfare]

For millions of tax returns, the Tax Tables don't apply.

Don't try to outsmart your tax software.