My employer under-reported my income on my W2. What form do I need to fill out adjust my 2016 return

[c-rybicki]

They probably did not take our enough taxes as a result. is there a deadline to update my return

[DoninGA]

You need to get a corrected W-2 from your employer if they reported an incorrect amount of earned income in box 1 of the 2016 W-2 you received.

[Opus 17]

Why do you think your income was under-reported?  If your box 1 income is less than your gross, that can be due to certain pre-tax deductions like health insurance premiums and 401(k) contributions.

[Hal_Al]

Box 5 of the W-2 is usually your total income and box 1 the amount subject to income tax

[c-rybicki]

My employee sent me a new W2 and an explanation letter stating that an error was found where they realized the amount they reported on the WS was less then I actually made and that I needed to update my filed return. What form do I use?

[DoninGA]

Your employer is required to give you a corrected W-2 if the information on the original W-2 is incorrect.  Speak with your employer and find out when they are going to provide that form to you.

[c-rybicki]

Yes. I have the corrected W2. Now, what do I do with it?? what form do I use to submit the corrected information? Is there a deadline? can it be done online"

[DoninGA · Accepted solution]

You will have to file an amended tax return, Form 1040X, and enter the corrected W-2.  An amended tax return for tax year 2016 can only be amended using the desktop amend software, not online.

If you used the TurboTax online editions to complete and file the 2016 tax return -

Go to this website to download the 2016 amend software - https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty16/

You will need to download the tax data file from the 2016 online account.

When you sign onto to your online account using the exact same user ID you used to create, complete and file the 2016 tax return you will land on the Welcome Home screen.  Click on My TurboTax at the top left of the program screen.  This will take you to the 2016 Timeline.  Under the section Some things you can do:  Click on Download .tax file

Or if you land on the Welcome Back screen click on the blue link Download your .tax file

An amended tax return has to be printed and mailed, it cannot be e-filed.