You will have until April 15, 2019. (Note the day) Generally, for a credit or refund, you must file Form 1040X within 3 years after the date you timely filed your original return or within 2 years after the date you paid the tax, whichever is later. For purposes of the limitation, a return filed or tax paid before the last day prescribed for its filing or payment (without regard to extensions) is considered filed or paid on that last day (Sec. 6513(a)).
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