If you had a profit on a Schedule C business, which was offset by your pass through losses, you would still owe self-employment taxes on that Schedule C profit.
For 2018, look at your return to see if Schedule 4 has been included. Self-employment tax is shown on line 57 of 2018 Form 1040 Schedule 4. There will also be a Schedule SE included as part of your return.
(If you are preparing your 2019 return, self-employment tax is shown on line 4 of 2019 Form 1040 Schedule 2.)
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