If your office location changed to New Jersey, then the income is no longer New York sourced. Allocating 20% of your income to New York would be accurate. As stated above, New Jersey will tax all of your income as a resident. However, your resident state will give you a credit of taxes paid to New York for your double-taxed income. The double-taxed income in your situation is the 20% earned in New York.
@Anonymous
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