DETROIT (AP) -- Tesla Motors CEO Elon Musk was paid just under $70,000 in 2013. But he could be in line for much, much more.

According to a Tesla filing with regulators Thursday, Musk made a base salary of $33,280 in 2013. That was the minimum he was required to make under California law. He got an additional $36,709 in company bonuses.

Tesla says Musk, the billionaire founder of PayPal and rocket-building company SpaceEx, only accepts $1 and returns the rest to the company.

Musk could someday rake in much more from the company he helped found in 2003. Under a compensation package approved in 2012, Musk was awarded options to buy nearly 5.3 million shares of Tesla stock at $31.17 each.

The stock closed Thursday at $207.86, making those shares worth more than $1 billion.

The plan is supposed to compensate Musk over a 10-year period, but only if the company meets performance goals. Musk can't exercise all the shares, for example, unless Tesla's shares reaching a total value of $43.2 billion. The company's shares are currently worth $25.6 billion.

Musk would also have to meet milestones for production of Tesla's planned Model X electric SUV and its Generation Three vehicle, which will cost around $35,000. Right now, Tesla only makes the Model S sedan, which starts at $70,000.

Tesla said in its filing that some incremental stock value goals have been achieved, but the operational milestones, while probable, have not been reached, so none of Musk's shares have vested.

Meanwhile, states looking at challenges to Tesla's direct-sales model should put consumers' needs ahead of auto dealers' interests, three top staff members of the U.S. Federal Trade Commission said Thursday.

As Tesla fights state by state for the right to sell its electric cars to consumers over the Internet without dealers, officials should consider the potential harm of banning challenges to existing industries and sales models, the directors said in a post on the agency's blog Thursday. The FTC has responsibilities on a national scale to promote business competition and protect consumers.

"Consumers can benefit from change," the officials said. "Regulators should differentiate between regulations that truly protect consumers and those that protect the regulated."

Tesla is appealing New Jersey's ban on direct sales in state court. Texas, Arizona, Virginia and Maryland have also passed laws barring the Palo Alto-based company's dealer-free system. Ohio and New York have passed measures negotiated with dealers that limit the number of company-owned stores.

The blog item was written by three FTC directors: Andy Gavil of the policy planning office, Debbie Feinstein of the bureau of competition, and Marty Gaynor of the economics bureau. The officials said they were expressing their own opinions, not that of the commission or any of its voting members.

Bloomberg News contributed to this report.