It depends. You need to know what specifically was corrected on the W-2. If the correction does not have to do with income or withholding amounts, it is likely that you only need to keep the form for your records. If the W-2c changes information on your tax return, however, you will need to file an amended return for this year's tax year. While you are not required to do so by April 17, 2018 (the filing deadline), if you owe additional tax, if you don't pay the additional tax by April 17, 2018, then interest will accrue on the tax due until paid off. Please see this FAQ on how to prepare the amended return (I would recommend preparing the amended return, and if you owe nothing additional, you can choose to not mail it. But you want to see for certain): https://ttlc.intuit.com/replies/3288565
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