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A PJ box 7 code requires an amended 2017 tax return to report it as 2017 income. Only the box 2a amount would be taxable (any earnings) , not your own contribution (box 1 plus earnings).
If you are over 59 1/2 then on the "Lets see if we can lower your tax bill" enter the box 2a amount in the "Another Reason" box to eliminate the 10% early withdrawal penalty on the earnings.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
https://ttlc.intuit.com/replies/3288565
You can check the status of the amended return here, but allow 3 weeks after mailing.
https://www.irs.gov/filing/individuals/amended-returns-form-1040-x-/wheres-my-amended-return-1
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