This bill makes it harder for large American companies to dodge taxes by moving their headquarters overseas—a practice called a "corporate inversion." Here's what's happening: When a U.S. company buys a foreign company and then claims the foreign company is now the parent, the whole group can avoid paying U.S. taxes on worldwide income. This bill lowers the threshold for when the government treats these inverted companies as still being American for tax purposes. Instead of needing 60% American ownership to be considered "inverted," the bill uses an 80% threshold, making it easier to catch these deals. The bill also creates a new category called "inverted domestic corporations" that applies to deals where a foreign company acquires a U.S. company's assets, and either more than 50% of the new company is owned by the old American shareholders, or the company's management and control stays primarily in the U.S. with significant American business operations. When these situations occur, the IRS will treat the company as American and tax it accordingly, preventing the tax avoidance strategy. There's an exception for companies that genuinely move their operations and have substantial business activities in their new foreign country, but the bar for proving this is high.