Why does he want to file an amended return for NY if he did not file a NY return in the first place? Amending is only used for returns that have been filed and processed, but with missing or incorrect information. Amending is not the way to go if he did not ever file a NY return. He should have filed a part-year CA return and a part-year NY return.
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https://ttlc.intuit.com/questions/1901227-how-do-i-file-a-part-year-state-return
https://ttlc.intuit.com/questions/1901560-how-do-i-file-if-i-moved-to-a-different-state-last-year
https://ttlc.intuit.com/questions/2895983-how-do-i-allocate-split-income-for-a-part-year-state-retur...
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