We don't seem to be able to communicate with each other. I am using tax and tax liability interchangeably. Taxable income and Tax are the words on the tax tables. If your taxable income is $68,300, your tax if filing Married Filing Jointly is $10,971. That is on p. 11 of the 2018 tax tables: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-dft/i1040tt--dft.pdf">https://www.irs.gov/pub/irs-dft/i1040tt--dft.pdf</...>
How did you calculate $68,300 of taxable income?
