A 10% Global Tax Flat Rate would do just fine ... it would work smooth and dandy, everybody will be happy, the government, companies and individuals ... we would start to love paying taxes ...
There exists approx. 51 offshore financial centres with almost 0% income tax on planet earth:
Andorra, Anguilla, Antigua and Barbuda, Aruba*, Bahamas, Bahrain, Barbados, Belize, Bermuda, British Virgin Islands*, Cayman-Islands, Jersey and Guernsey, Cook Islands, Dominica, Dubai, Gibraltar, Grenada, Hongkong**, Ireland**, Isle of Man, Jordan**, Libanon**, Liberia, Liechtenstein, Luxemburg**, Macao**, Maledives, Malta, Marshall Islands, Mauritius*, Monaco, Montserrat, Nauru*, Netherlands Antille, Niue*, Panama, Samoa*, Seychelles*, St. Kitts and Nevis, Saint Lucia, St. Vincent and die Grenadines, Singapur**, Switzerland**, Tonga*, Turks- und Caicos Islands, Vanuatu, Cyprus
* - only on the list of OECD
** - only on the list of Diamond and Diamond
The global 10% Income tax would help to bring back hidden money from tax havens and offshore financial centres to invest it again into global economy-, trade- and the financial system where it creates jobs, well fare and prosperity for the entire world.
Each person above minimum tax amount (low income are free from taxation), or company would pay its 10% income tax in their country of birth or registration.