Usually, there are 3 years to file and amend your return.

• You can File/Amend your return within 3 years and you will receive your refund if there is any.

• However, if you owe money to IRS, you are supposed to pay them on Time, that is during the tax year. 

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Following are the examples

• 2014 Federal Returns can be Filed/Amended Before 15th of April 2018.

• 2015 Federal Returns can be Filed/Amended Before 15th of April 2019.

• 2016 Federal Returns can be Filed/Amended Before 15th of April 2020.

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Note, If you owe taxes to IRS you have to pay them even if 3 years have passed with an amendment, but you will not receive the refund if you amend after period as mentioned above.