State tax filing

Daniel I also just noticed that I effectively have two W-2's for the same income.   Illinois taxed the entire gain on my Option Exercises, and withheld taxes as described earlier.  I also have a California W-2 which has the same Box 1 income as the Illinois W-2, but the "State Wages" in Box 16 are 67% of Box 1.  What does this mean, and can I use the lower Box 16 number as income on my CA state return??