After you file

You need to amend your return to add the Form 8938. Here is an excerpt from the IRS Basic Questions and Answers on Form 8938: "If you omitted Form 8938 when you filed your income tax return, you should file Form 1040X, Amended U.S. Individual Income Tax Return, with your Form 8938 attached." 

Note: Your amended return must be mailed to the IRS (you cannot e-file it.)

Once you start amending the return following the instructions in the FAQ below, you can create the Form 8938.

• Continue your return in TurboTax Online. 
• Click the drop-down arrow next to Tax Tools (lower left of your screen).
• Select Tools.
• In the pop-up window, select Topic Search.
• In the I'm looking for: box, type 8938.
• In the results box, scroll down and highlight 8938, then click GO.
• You'll land on the Foreign Financial Assets screen. Follow the onscreen instructions.

Note: If using the TurboTax CD/Download software, you'll use the Find function and the "Jump to" link (instead of "Tax Tools") to search for the topic.