For the 1099 income >> If there were no taxes withheld, leave all of those boxes blank. Everything will transfer to your resident state return. If you did the work in NJ, that is where you pay tax. You are not an employee for the 1099 income, so the convenience of the employer rule does not apply. If you file a NY nonresident return, TurboTax will ask you what income is allocable to NY. But if you did not do the work in NY and never lived in NY, you don't owe NY taxes. Your client (the payer) filled out that form, so you would need to ask the payer why they included that.
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