I think this is a good reason to take this study with a grain of salt. Having lived in WA most of my life, I have never had a reason to complain about taxes her

I think this is a good reason to take this study with a grain of salt. Having lived in WA most of my life, I have never had a reason to complain about taxes here. They feel far from regressive - I basically didn't pay anything until I owned a home. FWIW: back when Planet Money tried to find some sort of political consensus among economists, lack of an income tax was actually one of the proposals: https://www.npr.org/transcripts/499490275 https://www.npr.org/transcripts/499490275