I have a new client who is a resident of IL. He is a consultant and is W-2 shows in come for 4 states: IL, NY, CA, and MA. For CA and MA the W-2 shows a portion of the income that was earned in that state. For IL it shows 80% of the income being earned in IL and 100% of the income being attributed to NYC. Does anyone know how this is to be reported among the states?