If there are wages that were paid to you in any other year besides 2018 on your 2018 W-2, you need to ask your employer to correct the W-2. Only wages paid to you in 2018 should be on your W-2 for 2018. If you have back wages paid to you in 2018, they should be reported on your W-2 for 2018, and you need to claim them as wages for 2018.
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