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For the initial $20k, i did pay a 1040-ES of $6000 already though, which would have covered that $20,000.  Assuming that $6000 tax covers the initial $20,000, wouldn't my federal tax owed be $7200 or so, and not $9000?

Sorry for all the 'dumb' questions... I guess i'm just trying to wrap my head around this.  

I looked at the tax brackets for state, and I won't be jumping brackets either..

So based on your math, please correct me if i'm wrong:

- 20,000 x 15.3% self-employment tax = $3,060
- $40,000 x 15.3% self-employment tax = $6,120

It also looks like the difference between $20,000 and $40,000 taxes owed is roughly $3000, not the $7800 difference that turbotax is showing.