Part year new jersey resident sold stock for gains before becoming resident

[njresident]

I moved to New Jersey in October 2019 and hence filling part-year new jersey resident. I sold stocks for substantial gains in August 2019. Am I supposed to NJ state taxes on these gains? (I was a resident of Washington before October 2019, which is a no-state tax state)

[DavidS127 · Accepted solution]

No, you the gains you realized before you moved to NJ are not taxable by NJ.  You file as a part-year resident, and include on the NJ return only the income received while a resident of NJ.  As you prepare your NJ state tax return, be aware for screens that may need a manual entry by you to report the income received while a NJ resident.