How many years can you go back to amend a return that was filed and accepted?

[DoninGA]

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@Meaderw78  wrote:

Can I ammend my 2014 return if I am still not paid it completely.?

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You can amend any tax return that you have filed regardless of the tax year filed.  However, if the amended return has a tax refund it will not be paid since it has been more than three years from the due date of the 2014 return.  April 15, 2018 was the latest you could file a 2014 amended return for a refund without an extension.

If taxes are owed on the 2014 amended return then you should seek out a local tax professional to assist you in completing the 2014 amended tax return.

[Mike9241]

1040-x instructions

An amended return is an IRS form that can be used to fix information on an annual tax return you’ve already filed. You must submit your amendment either within three years from the date you filed the original return or two years from when you paid taxes owed from the return—whichever is later.

if you file more than 3 years ago then it would seem you have to pay the balance due to amend.