1) Yes, the PDF copy of your W-2 form is sufficient for your records.
2) No, you will be filing an amended return. This return is not due by April 15th. You can file the amended return three years from the date you filed your return or two years after you paid the tax due, whichever is later.
3) It depends. I would recommend reviewing the information on your corrected Form W-2. If there are changes in the income and taxes withheld, then you will need to amend your state return. If there are no changes, then you would not need to amend the return.
Attached is a link with instructions to assist you in preparing your amended return.
How to amend my return?
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