Politico’s Danny Vinik: “Thanks to a quirky proposed surcharge, Americans who earn more than $1 million in taxable income would trigger an extra 6 percent tax on the next $200,000 they earn—a complicated change that effectively creates a new, unannounced tax bracket of 45.6 percent. … The new rate stems from a provision in the bill intended to help the government recover, from the very wealthy, some of the benefits that lower-income taxpayers enjoy. … After the first $1 million in taxable income, the government would impose a 6 percent surcharge on every dollar earned, until it made up for the tax benefits that the rich receive from the low tax rate on that first $45,000. That surcharge remains until the government has clawed back the full $12,420, which would occur at about $1.2 million in taxable income. At that point, the surcharge disappears and the top tax rate drops back to 39.6 percent.”

Vinik writes that the surcharge would have affected more than 400,000 tax filers in 2015, according to IRS data, and that it could raise more than $50 billion in revenue over a decade. At a Politico event Friday, House Ways and Means Chairman Kevin Brady said the surcharge, sometimes called a bubble rate, was included to try to drive more middle-class tax relief.