if the $13,000 is from self-employment - i.e. you're filing schedule C you will owe self-employment tax of about
$1,800 about another $100 in regular income taxes and if you failed to meet the required payments during the year there would be penalties for underpayment of estimated tax.
if you are not self employed, did you have marketplace insurance where your credit was to large so now you need to pay back the excess.
other than that, check all your entries
