Self Employment Tax?

TurboTax tells me "After applying your deductions, your taxable income is $0. Based on this amount, your total tax before any credits is [equivalent to ~27% of my total income]. This includes self-employment tax of [equivalent to ~27% of my total income]."

This text makes it sound like I shouldn't have any amount viable to be taxed via income tax, so I should have the 15% self-employment tax on my income only, not 27%. Am I reading this correctly?