If I haven't received my W-2 or if I lost my W-2, can I still e-file my tax return?

No. You need to wait until you get your W-2. Ask your employer for a new W-2 if you lost the original one.

If you have additional questions on where to include different types of income, or where to enter information from forms other than your W-2 , search for the income or form using our search tool at the top of the screen.