Personal (Employment) Income Tax Rates Around the World (as at September 2018):
Aruba is progressive up to 58.95%.
Bahamas is 0% as there is no personal income tax.
Belgium is progressive up to 50%.
Brazil is progressive up to 27.5%.
Gibraltar is a flat rate of 20%.
Hungary is a flat rate of 15%.
Israel is progressive up to 50%.
Lebanon is progressive up to 20%.
Netherlands is progressive up to 51.95%.
Russia is a flat rate of 13%.
Singapore is progressive up to 22%.
United Kingdom is progressive up to 45%.
Zimbabwe is progressive up to 50%.
https://www.xpatulator.com/cost-of-living-article/Personal-Income-Tax-Rates-Worldwide_727.cfm