Yes, you can. To verify or change your social security number in TurboTax Online:
- Open TurboTax Online
- Select Tax Home in the left pane
- On the Hi, let's keep working on your taxes! screen, select the dropdown on the right side of the Personal Info box, then select Continue
- On the Personal info summary screen, select Edit to the right of your name
- On the Your personal info screen, verify or correct your social security number in the SSN or ITIN box
- Select Continue
If you've already filed your return, you can't edit this information. However, the IRS will have your information in its database.