1. Yes your New Jersey W2 wages for Box 16 will have the correct adjustments so you will only have to determine if any amounts need to be added for the other W2.
2. You would not need to make any adjustments for the Code C (Life insurance taxable) or DD (Employer provided health insurance or Box 14 NYPFL.
3. If you had after tax health insurance deductions, they would be in Box 14 (but this is not a mandatory reporting) so you would have to ask you employer- this would be extremely rare.
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