2018 Untaxed Relo Bonus in my 2019 W-2

Received a relo bonus (untaxed) in 12/2018.

Employer’s 2018 W-2 didn't include this bonus (nor any 1099 etc), so we added it to our 2018 tax return as “additional income” & paid the taxes on this untaxed bonus.


However, Employer’s 2019 W-2 has included this relo bonus from 12/2018, as part of my total gross 2019 income.

 

What is the best way to fix this?

1. Request a new 2019 W-2 from employer?
2. If we don’t get a new or modified W-2, do we have to file an amended tax return for 2018, OR
3. Is there anywhere on my 1040 for 2019 filing that should exclude this 2018 bonus as part of of my 2019 gross amount?

 

tia!