The Supreme Court is taking up a case that could rule out a tax on wealth favored by some Democrats

The Supreme Court is taking up a case over a Washington couple’s $15,000 tax bill that is widely seen as a test of a never-enacted tax on wealth. Arguments are being heard Tuesday. A decision in favor of Charles and Kathleen Moore of Redmond, Washington, could strike down a provision of the 2017 tax bill that is expected to bring in $340 billion, threaten other provisions of the tax code and rule out a wealth tax that is favored by some Democrats who argue that the wealthiest Americans don’t pay their fair share of taxes. The couple is backed by conservative political groups and business interests, including the U.S. Chamber of Commerce.