If the U.S. Treasury's new rules on inversions mean more transparency in the tax code, it's a welcome change, Christine Lagarde, managing director of the International Monetary Fund, told CNBC's "Squawk on the Street" on Thursday.
"The U.S. tax regimes are probably some of the most sophisticated and the most complicated regimes in the world," Lagarde said. "I really welcome the determination of the U.S. Treasury to bring about more transparency and a better understanding of the rules, and the principle of fair share of tax being levied and collected in the right places."
Earlier this month, the Treasury announced regulations to limit U.S. companies from moving abroad for lower tax rates by making it less economically beneficial. Treasury Secretary Jack Lew called on Congress to create legislation that would halt the practice.