After you file

Yes, you need to amend your return since you left off part of your income. 

If you add the income and your result does not change you don't need to file your amendment. I mention that because whether your Social Security income is taxable, depends on your filing status and the amount of other income you have. 

To amend your return in TurboTax online:

1. Sign in to TurboTax using the same account you used to file your taxes. 
2. On the home screen, scroll down to Your tax returns & documents and select 2022.
3. Select Amend (change) return, then Amend using TurboTax Online.
4. On the screen OK, let's get a kickstart on your amended return, select the reason(s) you're amending and Continue.
5. When you reach Here's the info for your amended federal return, select the topic you need to change. 
6. Continue through the screens and carefully answer the remaining questions to finish amending your return

To amend your return in TurboTax Desktop (from a disc or download):

1. Open the TurboTax CD/Download software for the year you're amending.
2. Under Need to File an Amended Return?, select Amend a Filed Return
3. Select Amend for the return you need to amend
4. On the We’ll help you change (amend) your return screen, select Continue
5. Select Yes, I’ve already filed my return
6. Choose the option that best applies when asked Tell us a little more about your amend situation and Continue
7. On the next screen, select Update next to the info you need to change
8. Continue through the screens, make the changes you need to make, and carefully answer the remaining questions to finish amending your return
9. Don’t forget to select Save As (or Duplicate on Mac) from the File menu when you save a copy of your amended return. This will preserve the tax return you originally filed.
10. Give the file a different name from the original, like 2022_amended_tax_return_Smith