Executives of companies receiving federal bailout money will have their pay capped at $500,000 under a financial compensation plan that President Barack Obama is expected to announce Wednesday, two senior administration officials said.

Under the president's plan, companies that want to pay their executives more than $500,000 will have to do so through stocks that cannot be sold until the companies pay back the money they borrow from the government, according to administration officials.

Compensation experts in the private sector have warned that such an intrusion into the internal decisions of financial institutions could discourage participation in the rescue program and slow down the financial sector's recovery. They also argue that it could set a precedent for government regulation that undermined performance-based pay.

"I really don't want the government to take over these businesses and start telling them everything about what they can do," Sen. Mitch McConnell of Kentucky, the Republican leader, said this week. "Then you truly have nationalized the business."

"I do know this: We can't just say, 'Please, please,'" said Sen. Claire McCaskill, D-Mo., who has proposed that no employee of an institution that receives money under the $700 billion federal bailout can receive more than $400,000 in total compensation until it pays the money back.

The administration official, speaking on the condition of anonymity because the plan had not yet been made public, said the most restrictive limits would apply only to struggling large firms that receive "exceptional assistance" in the future. Healthy banks that receive government infusions of capital would have more leeway.

Banks and other financial institutions that receive capital infusions, but are considered healthy, could waive the $500,000 salary cap and the stock restrictions under the new Obama rules.