Tax estimator shows federal tax due as rather low. Does it include self-employment taxes?

I used the turbo tax estimator to estimate my taxes for 2020. No W2 income this year. Only self employment income ... 

 

I put in income as $68,000 (just an estimate, it could be more at the end of the year)

Expenses $5,000 

 

It put my estimated federal tax due as $12,824 ....  my question is, does this include my self employment taxes which are at 15%? I am single and my standard deduction is $12,400 I believe. 

 

At that tax bracket, income taxes are at 22% and estimated taxes at 15%... why does it say estimated federal tax due as 12k? 

 

if my math is correct, $63,000 (income minus 5k expenses) - $12,400 =  50,600 

 

22% tax + 15% SE tax is  37%.  37% of $56,000 is $20,720 ?  Why does the estimator say 12k? 

 

Also, do you have an estimator for state taxes? 

 

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