The $15,129 from form 8949 is (apparently) included in the $16,547 on lie 6 of form 1040. So, you can be sure that TurboTax is calculating any tax due and including it on line 12b of form 1040.
Yes, you're ok throwing your numbers out there. That helps get to the answer. What amount is on line 11b? If less than $40,125, then the tax on your long term capital gain is $0 (Single filing status). It may be you just haven't entered your other income yet; so the amount on line 12b is premature.
