1....As long as you have not actually filed yet.
Navigate back to the Federal taxes section, go to the Wages&Income page and edit that W-2.
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2....IF you have E-filed already:
, you'd have to wait for the Federal and state to reply about whether they accepted, or rejected your e-file. IF the Feds Reject, then the state is also automatically, then you can edit the W-2 entries (and fix what caused the rejection) and re-e-file.
IF the Feds and State accept your E-file...then you wait for the refund, or pay what you owed on the first filing, and in mid-late Feb, you'd start the Special Amend process to fix it, and mail in the amend paperwork. (whether Amending the Federal would do anything...depends on what else is in your Fed tax return...but the Amended MA would/should result in a refund.)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
