Thank you

If my husband input his info on his account, then we decided to do jointly instead of separately, does his W-2 info carry over on to the joint one with his SSN since he’s already in Turbo Tax too?

No, you will have to enter all of your husband's information into the joint account. 

You can follow these steps in TurboTax to add his W-2:

1. Open your tax return. 
2. Search for W-2 with the magnifying glass tool on the top of the page. 
3. Select the Jump to W-2 link at the top of the search results.
4. Click on Add a W-2.
5. Follow the on screen instructions to add your his W-2.

@cdockter2

Okay. We did them under my account, so we have to create a joint account, or does marking as filing jointly count as joint account? Thanks!

@cdockter2 

When you enter your own information in My Info, you have to answer the question "Were you married?"  If you click the button for Married, then a drop down will appear that asks, "Do you want to file this return together with your spouse?"  Then you choose yes to file a joint return.  You would then enter your spouse's information into Personal Info.

 Whenever you are entering income information there should then be a spot for you and for your spouse's income information with your names by them.

When you prepare a joint return you include all the information for both spouses on the SAME tax return.  Include all of your personal information, all of your income from every source, all dependents (if any), all credits and deductions for both of you.  You get ONE refund with both names on it.

Okay, the joint account confused me, thank you for clarifying! So it’s fine we did it under my account since I selected we were filing jointly. Thanks to both responders!

Your personal account will become your joint account and his old account will simply go dormant.  Before he forgets how to access it he should log in and download all the PDF & .taxfiles  to save for the future.  You should do the same ... save them all to a removable storage unit like a thumb drive to keep them safe and have them available anytime you need them.  

Also ... once you file a joint return keep the positions the same going forward ... switching positions on a tax return confuses the IRS so don't do it.