If you have received a determination letter from the IRS, use the instructions in the link below to amend your 2017 tax return. You will remove the self-employment income and replace that income with ''Other reportable wages'' under the Miscellaneous Income section.
You will click through the screens in that section until you come to a screen titled Employee Compensation Not Reported on a W-2, see attached. You will be prompted to enter a code which reflects the status of your SS-8 determination and the date of the letter.
And yes, TurboTax will calculate all of the taxes and prepare Form 8919 for you. How to access and amend your 2017 return
Please see Instructions for Workers