Start with the one that has the most information filled in.
The second W-2 is either reporting additional information for boxes 18-20 or corrected information for boxes 18-20. Double check the second W-2 to see if it is marked as a corrected W-2, or W-2C.
If it is a corrected W-2, then replace the information for boxes 18-20 shown on the first W-2 with the information on the W-2C. Then on the follow-up screen after you have entered the W-2, check the box for corrected W-2.
If it is not a corrected W-2, add a second line of information for boxes 18-20 when you are entering the W-2 into TurboTax.
Either way, you will only have one W-2 entry in TurboTax for that employer.
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