I checked and ~22% of GWWC members* did not donate more than 5% of their income in 2017, so even assuming taxes accounted for a large portion of the issue, there are still a lot of people who are not reporting data consistent with keeping the GWWC pledge.
*this analysis was limited to people who (a) took the 2018 EA Survey, (b) reported having taken the GWWC pledge, (c) reported income and donation data, (d) are non-students, (e) have income >$10K, and (f) reported joining GWWC prior to 2017. N=253.
I checked and ~22% of GWWC members* did not donate more than 5% of their income in 2017, so even assuming taxes accounted for a large portion of the issue, there are still a lot of people who are not reporting data consistent with keeping the GWWC pledge.
*this analysis was limited to people who (a) took the 2018 EA Survey, (b) reported having taken the GWWC pledge, (c) reported income and donation data, (d) are non-students, (e) have income >$10K, and (f) reported joining GWWC prior to 2017. N=253.