You don't owe any regular income tax on your income. But you owe the self employment tax on your business income. 2 different kinds of tax. You owe self employment tax on a Net Profit of $400 or more on Schedule C .
The regular income tax is on 1040 line 16 & 22.
The SE tax will be automatically included in your tax due or reduce your refund. It is on the 1040 Schedule 2 line 4 which goes to 1040 line 23.
The 15.3% self employed SE Tax is to pay both the employer part and employee part of Social Security and Medicare. So you get social security credit for it when you retire. That is the payroll tax.
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