If there is an error or missing information on the W-2 that you got from your employer, you have to ask the employer to issue a corrected W-2.

If you imported your W-2 into TurboTax and some of the imported amounts are missing, incomplete, or incorrect, delete the imported W-2 and enter it manually instead. That will be a lot faster and easier than trying to get the import problems corrected. Importing your W-2 is a nice convenience, but it only takes a minute or two to enter a W-2 manually.

Box 1 of the W-2 shows wages, tips, and other compensation subject to federal income tax. It includes value of taxable fringe benefits, but it does not include elective deferrals such as employee contributions to 401(k) plans. 

Boxes 15-20 show your state and local tax information. If it looks like something is missing in these boxes, I recommend that you contact the W-2 issuer.