There was no "hence salary" part. The salary back-estimation was very rough, e.g. for my income the estimation by a popular calculator was off by 25%. Using past tense here because anonymous access to tax data is discontinued.
You could tell if someone was poor or rich based on that, but for comparing incomes in your cohort it was not very useful.
You could tell if someone was poor or rich based on that, but for comparing incomes in your cohort it was not very useful.