@worrall235 NJ does use the method I provided in my original answer, but I have edited it because of a required NJ programming quirk that you may also be seeing.
But, otherwise, NJ will use all of the income to determine tax. It will look on the NJ tax form that they are taxing all of the income, but they are not. They are pretending all of the income is taxable to NJ, and prorating the tax to the income earned in NJ. It does not matter where the other income is earned, this is the method NJ uses.
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