If I need to amend 2W for just a check mark on retirement plan do I need to enter the entire W2 for the amended

[JulieS]

No, you only need to check that box on your W-2 and it's possible you don't have to send in the amended return at all if it doesn't change your balance due, or refund. 

Here's how to make sure:

1. Sign in to your TurboTax account.
2. Scroll down to Your tax returns & documents and select 2023.
3. Select Amend (change) return, then Amend using TurboTax Online.
4. Carefully follow the directions to start your amendment.
5. Your refund will go to zero, don't worry, that's normal.
6. On the screen OK, let's get a kickstart on your amended return, select W-2, and Continue.
7. When you reach Here's the info for your amended federal return, select Start 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. If your refund still shows 0 after you check the box on your W-2, don't have to file the amended return because it didn't change your results.