Does it make sense that my 2021 adjusted income is 14,500 and I have to pay almost $600 in federal taxes (I had non withheld )?

[xmasbaby0]

Maybe---since you are posting from Self-Employed that means you need to pay self-employment tax for Social Security and Medicare.  You have not told us anything else about your filing status, dependents (if any) etc.

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs

[Mike9241]

yes. it is possible.  your net Schedule C income is subject to a 14.1% net Self employment tax (see schedule SE). in addition, you're subject to income taxes on your net taxable income