You can only file a 2018 W-2 with a 2018 tax return or a 2018 amended return if you already filed 2018. 2018 can only be done using the 2018 desktop software and mailed.
You can purchase 2018 software here.
https://turbotax.intuit.com/personal-taxes/past-years-products/
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
