The review could adversely affect WA which receives a higher share of GST funding thanks to a 2018 deal that is under the Productivity Commission’s lens. Treasurer Jim Chalmers last week announced the Productivity Commission will review the 2018 deal that gave states a guaranteed minimum share of the goods and services tax (GST). Thanks to high iron ore and gas prices – on top of the special GST deal – WA now has a large budget surplus, when other states and territories are struggling. The West Australian newspaper said “the strong result is sure to put pressure on the 2018 GST deal”. The problems with the 2018 dealMost economists and commentators outside WA are critical of the 2018 deal that carved up GST revenues.