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WASHINGTON (AP) – The U.S. Postal Service will stop delivering mail on Saturdays but continue to deliver packages six days a week under a plan aimed at saving about $2 billion annually, the financially struggling agency says.

In an announcement scheduled for later Wednesday, the service is expected to say the Saturday mail cutback would begin in August.

The move accentuates one of the agency’s strong points _ package delivery has increased by 14 percent since 2010, officials say, while the delivery of letters and other mail has declined with the increasing use of email and other Internet services.

Under the new plan, mail would be delivered to homes and businesses only from Monday through Friday, but would still be delivered to post office boxes on Saturdays. Post offices now open on Saturdays would remain open on Saturdays.

Over the past several years, the Postal Service has advocated shifting to a five-day delivery schedule for mail and packages _ and it repeatedly but unsuccessfully appealed to Congress to approve the move. Though an independent agency, the service gets no tax dollars for its day-to-day operations but is subject to congressional control.

It was not immediately clear how the service could eliminate Saturday mail without congressional approval.

But the agency clearly thinks it has a majority of the American public on its side regarding the change.

Material prepared for the Wednesday press conference by Patrick R. Donahoe, postmaster general and CEO, says Postal Service market research and other research has indicated that nearly 7 in 10 Americans support the switch to five-day delivery as a way for the Postal Service to reduce costs.

“The Postal Service is advancing an important new approach to delivery that reflects the strong growth of our package business and responds to the financial realities resulting from America’s changing mailing habits,” Donahoe said in a statement prepared for the announcement. “We developed this approach by working with our customers to understand their delivery needs and by identifying creative ways to generate significant cost savings.”

The Postal Service is making the announcement Wednesday, more than six months before the switch, to give residential and business customers time to plan and adjust, the statement said.

“The American public understands the financial challenges of the Postal Service and supports these steps as a responsible and reasonable approach to improving our financial situation,” Donahoe said. “The Postal Service has a responsibility to take the steps necessary to return to long-term financial stability and ensure the continued affordability of the U.S. Mail.”

He said the change would mean a combination of employee reassignment and attrition and is expected to achieve cost savings of approximately $2 billion annually when fully implemented.

The agency in November reported an annual loss of a record $15.9 billion for the last budget year and forecast more red ink in 2013, capping a tumultuous year in which it was forced to default on billions in retiree health benefit prepayments to avert bankruptcy.

The financial losses for the fiscal year ending Sept. 30 were more than triple the $5.1 billion loss in the previous year. Having reached its borrowing limit, the mail agency is operating with little cash on hand.

The agency’s biggest problem _ and the majority of the red ink in 2012 _ was not due to reduced mail flow but rather to mounting mandatory costs for future retiree health benefits, which made up $11.1 billion of the losses. Without that and other related labor expenses, the mail agency sustained an operating loss of $2.4 billion, lower than the previous year.

The health payments are a requirement imposed by Congress in 2006 that the post office set aside $55 billion in an account to cover future medical costs for retirees. The idea was to put $5.5 billion a year into the account for 10 years. That’s $5.5 billion the post office doesn’t have.

No other government agency is required to make such a payment for future medical benefits. Postal authorities wanted Congress to address the issue last year, but lawmakers finished their session without getting it done. So officials are moving ahead to accelerate their own plan for cost-cutting.

The Postal Service is in the midst of a major restructuring throughout its retail, delivery and mail processing operations. Since 2006, it has cut annual costs by about $15 billion, reduced the size of its career workforce by 193,000 or by 28 percent, and has consolidated more than 200 mail processing locations, officials say.

They say that while the change in the delivery schedule announced Wednesday is one of the actions needed to restore the financial health of the service, they still urgently need lawmakers to act. Officials say they continue to press for legislation that will give them greater flexibility to control costs and make new revenues.

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