The Postal Service said that its loss includes $11.1 billion in defaulted payments it owes to "prefund" health benefits for future retirees. Postal officials have complained for years about these prepayments, which are required by Congress, to pay for future retirees. The Postal Service also points out that other federal agencies don't have similar mandates for prefunding.
The Postal Service defaulted on two health care prefunding payments during its 2012 fiscal year, which ended on Sept. 30.
Its total losses of $15.9 billion are more than triple the $5.1 billion in losses it posted in the prior year, the Postal Service said.
Fredric Rolando, president of the National Association of Letter Carriers, blamed the Congressionally mandated prefunding for the bulk of the Postal Service's financial woes.
"The mandate has depleted Postal Service funds, forcing the [agency] to give up any quarterly or annual profits, empty its bank accounts and exhaust its borrowing authority ... to satisfy an unfair political mandate," Rolando said in a written statement.
He said that without the mandate, the Postal Service would have lost $2.2 billion this year. While that's still a deficit, he said it's about half the $4.9 billion it lost last year.
The Postal Service has been struggling with declines in mail revenue, which is a casualty of a sluggish economy as well as the Internet.
The agency has made various efforts to reduce costs. It plans to cut 150,000 workers through 2015, reduce existing staffers' work hours and hike the price on first-class stamps by one cent to 46 cents.
Officials have threatened to scale back service to five days, shuttering their low-volume, low-revenue, Saturday service. But the notion of five-day service is intensely unpopular in Congress and unlikely to prevail.
Unlike other federal agencies, the Postal Service does not receive taxpayer support, though it has borrowed $15 billion from the U.S. Treasury.
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