Sorry, I was just calculating it as 10% of federal credit in my case, but we should consider the number of months stayed in NJ according to Ref: https://www.state.nj.us/treasury/taxation/pdf/current/1040i.pdf
Page 42: Part-Year Residents. Prorate your credit based on the number of months you were a New Jersey resident.
Two points here:
1. TurboTax didn't provide any clue on "explainWhy" or "How did you calculate", but I'm fine with it now 😐.
2. Its about the State rules and nothing on TurboTax, I paid entire portion to someone NJ resident to take care of my dependent, then why should it be a prorate for part-year resident? Why can't it be calculated like INT or DIV 😠.
