No, you need to file in NJ because you have some NJ income and your total income from everywhere is more than $10,000 if single or $20,000 if you are married.
2. If you don't bother, you may get contacted by NJ about it in the future.
3. I doubt you would owe more than the amount that was withheld, but the only way to be certain is to complete the NJ state return.
4. Yes, Column A is your entire income as shown on your federal return. Column B is the amount attributable to activities in NJ. The NJ tax return calculates NJ tax on your entire income and then prorates that amount by the NJ income.
For example, say your federal income is $100,000 and your NJ income is $3,000. The NJ tax on the $100,000 would be multiplied by 3% to arrive at your NJ tax as a non-resident.
5. Yes, you can do your NJ return in TurboTax. If you are still working on your tax return, click on State on the left side menu, then +Add State toward the lower left corner. Select New Jersey and Continue.
If you completed and filed your 2022 tax return, log back in, scroll to the bottom, click on 2022 and click Add State.
6. Yes, your NJ income as reported by your employer is the amount in box 16 on your W-2. If you think it is wrong, you can contest that, but you can expect that NJ will not agree.
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