You will need to file an amended return to correct the Social Security Number used on the Schedule C if your return has already been accepted by the IRS.
There will be no numerical changes in your return by making this change, but it is important due to the self-employment tax. With the incorrect SSN, the wrong person will be getting credit for the income with regard to Social Security.
See the following information for guidance to file an amended return using TurboTax.
How do I amend my TurboTax Online return?
