The high court order is likely to mean months of additional uncertainty for millions of borrowers.
The decision could reduce the commission's ability to extract high-dollar settlements.
The case was closely watched for its potential impact on Democratic proposals to impose a wealth tax.
The rebuff ends months of deliberations over the cases.
Democratic dreams of imposing a wealth tax on the richest Americans risk being snuffed out by the US Supreme Court in a dispute over a $14,729 bill...
The justices tried to avoid a sweeping ruling that could green-light future wealth tax proposals.
The justices are considering whether Congress can put a levy on stock holdings, real estate and other wealth.
Democratic dreams of imposing a wealth tax on the richest Americans risk being snuffed out by the U.S. Supreme Court in a dispute over a $14,729 bill...
Several justices were skeptical of UBS's arguments against the whistleblower law.
Even some of the court's conservative justices indicated they are inclined to back the agency.