I've stated this previously, but it seems like time to repeat it.

I travel to Portland's VA Medical Center for medical care regularly at my expense (because the Anchorage VA Clinic is terrible in providing required services to women veterans). The vast majority of flights between ANC and PDX are jam-packed with slope workers coming to or leaving from work. I know this because I often speak with them in the boarding areas. Perhaps they buy a beer at the airport, but nothing else. Some of them absolutely hate Alaska. 

These workers pay income tax on very high salaries earned in Alaska to Utah, Oregon, Oklahoma, Arizona, and other states. One told me that if he has to pay income tax to Alaska rather than to his home state, he will quit slope work.

It's true that the proposed Alaska income tax would generate revenue from some Alaskans. It's also true that it would generate considerable revenue from highly paid slope workers who live and pay in other states.