Last month Tesla said a new financing arrangement would make the Model S cost a mere $500 a month. Following critique in the press of Tesla's creative accounting, CEO Elon Musk announced revisions to the financing plan, now citing a net cost of $580 per month.
The two substantive changes to Tesla financing involve a revised resale value guarantee and longer term loans from partners Wells Fargo and U.S. Bank.
With the longer term loans, Tesla says the per-month cost of a Model S will be $580, taking into account the savings gained by running the car on electricity over an equivalent car running on gasoline. Tesla also says that those purchasing the Model S for a business can run the per-month cost down to $350.
Previously, Tesla had said it would guarantee the resale value of a Model S as being equivalent to that of a Mercedes-Benz S-class. That guarantee was revised in today's announcement to a value matching that of a BMW, Audi, Mercedes, Lexus, or Jaguar.
The Tesla Motors site is currently down, but it will host a revised calculator and information on the financing plans, so individuals can determine their per-month cost of purchasing a Model S.