Kon man:
HB 115 would raise an estimated $700 million a year.
https://www.adn.com/politics/alaska-legislature/2017/04/15/alaska-house-votes-to-levy-statewide-income-tax-sending-measure-to-a-hostile-senate/

Here is the most recent version of it. It's got all the details you could possibly want.
http://www.legis.state.ak.us/PDF/30/Bills/HB0115D.PDF

Now how much will your sales tax bring in?