The rate in this country related to the incomes taxes it currently at 18% (the highest has been 20%) So what? Not much difference compared the incomes. Any income shall be taxed, there is nothing wrong. At least the citizens know where the government stands, but generally speaking, any citizen knows there will be a tax.
https://tradingeconomics.com/country-list/personal-income-tax-ratethe citizens know that they will not pay it anyways
since nobody does, more than 35% of the ukrainian economy is in a shadow (different sources=different figures)
https://www.researchgate.net/publication/269626771_Shadow_economy_in_Ukraine_modelling_and_analysis this one gives a 34% figure
which I personally,consider way too low
it is common to recieve only slightly higher than the minimal wage to keep the taxes low and get the rest as they say "in an envelope" i.e. in cash
do you really expect anyone in their right mind would go and pay 19.5% of their trading or any other ,including mining,income to state?