From the Tools drop down, choose Tax Tools, then Delete a Form. I tested this in TurboTax and realized that if you change your answer to NO after you already entered yes, TurboTax doesn't update the change on your tax return. There is no self-employment tax when you answer NO. Since changing your answer to NO is not working correctly, leave your answer YES, but enter 0 for the amount of back wages. This will put all of the 1099-MISC income on Line 8 of Form 1040. Or you may want to delete it completely and reenter it from scratch. For me, entering zero as the amount of back wages worked as I expected it to.
I believe what you may be seeing with your tax bill when entering this, is when you answer YES, TurboTax is correctly moving the back-wage portion to Line 1 - Wages and this is increasing your Earned Income Credit by more than the ordinary tax generated by answering NO. But none of the 1099-inc should be reported as wages - you got a W-2 for that. If misreporting the income as wages increases your Earned Income Credit and therefore your refund, the IRS might deny your credit and disqualify you from claiming the credit in the future. So, if you qualify for EIC, make sure you are not overstating your wages. Your EIC credit is on Line 27a. See Over or Underreporting Your Income or Expenses.
The W-2 amount should be on Line 1 of your tax return, and the 1099-MISC amount should be on Line 8 - Other income. You can verify there is no self-employment tax on your return by checking Line 23 of Form 1040. Any SE tax is included there - and you can see the breakdown of those taxes on Schedule 2. SE tax is Line 4. You may have something else on your return generating the SE tax, but it does not appear to be coming from the 1099-Misc entry. @itsmy99
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