You likely are not able to amend your 2014 tax return.
You have three years from the date that you filed your original tax return or two years after the date that you paid the tax on that tax return to amend or make changes.
Retain the form with your tax records should the questions arise.
See IRS Topic No. 308, Amended returns, here.
When to file
Generally, to claim a refund, you must file Form 1040-X within 3 years after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.
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