Yes, you need to fill out IT-203-B. Unfortunately, NY nonresident wages must be allocated to New York according to a fraction, the numerator of which is the number of days worked in New York and denominator of which is the total number of days worked everywhere. I know you have an exact NY wage amount according to your HR department. As such, your allocation should be close to the amount of NY wages on your W-2. This is a favorite area of audit for the NY tax authorities.
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