Yes, amend your 2014 income tax return and enter the corrected 2014 W-2 to get the money back that you overpaid (with interest).
The law gives taxpayers three years to submit a return and claim a refund. The three-year countdown starts on the original due date.
Here are the instructions to file an amended return:
https://ttlc.intuit.com/replies/3288565
Additional Information:
https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/Last-Chance-to-Claim-Your-Tax-Refund/I...
