My son received a 2015 W-2 form in 2017. It came with 3 others for 2016. It is from the same company.

[KatrinaB · Accepted solution]

He will need to add his 2015 W-2, by amending last year's tax return. Please view the Turbo Tax FAQ below for instructions on filing an amended tax return.

https://ttlc.intuit.com/replies/3288565

If he hasn't filed a 2015 tax return, then he can still do so. He will need to buy the CD/Download version of Turbo Tax to complete this prior year return. Please view the link below, if you would like to purchase this software.

https://turbotax.intuit.com/personal-taxes/past-years-products/