Open your form 1040 in Forms Mode.
Look at lines 57-to-67. Those taxes are assessed no matter what your tax is on line 56.
For example, people with some Self-employment income...greater than $400, still have to pay SS&Medicare taxes. A 10% penalty for an early withdraw from a retirement fund, still have to pay that penalty. But there are 10 lines of other stuff, as noted above.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
