NIO. A 2018 W-2 cannot be entered on a 2019 tax return. The 2018 W-2 can only be entered on a 2018 tax return.
See this for amending a 2018 tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/01/27579
