STUDY ECONOMY AND FINANCE TAXING BILLIONAIRES FAIRLY A German perspective on the Brazilian G20 proposal for a globally coordinated tax on ultra-high-net-worth individuals Julia Jirmann and Christoph Trautvetter September 2024 During its G20 presidency, Brazil forwarded a proposal for a globally coordinated mini­mum tax on the ultra-wealthy. Depending on how it is de­signed, the estimated additional revenue from such a tax would amount to between 242 billion and 377 billion US dollars worldwide or even more. The authors analyse possibilities of implementing various op­tions in Germany and conclude that the introduction of such a tax would not pose any legal problems. According to their es­timates, the tax would generate revenue in an amount between 11 and 28 billion euros and only affect around 250 to 5,000 households. Collection costs would be commensurately low. The necessary valuation bases and measures to prevent tax evasion are already largely in place in Germany. Nevertheless, Germany would benefit from an improved exchange of data and an expansion of taxation rights previously constrained by double taxation treaties, but above all from Euro­pean and internatio­nal initiatives.