Different MSD's?

Why would 1 dealer have the MSD at 500.00 (per…7 allowed) and another dealer quote 550.00 MSD for basically the same car (BMW). There is appx. 1000.00 difference in the MSRP’s of the 2 cars. Is that the difference? Are the security deposits based on the value of the car? and, if so, is it a %? New to this MSD carry on…thanks

It rounds up to the nearest $50 of the payment.

$484 is a $500 MSD

$505 is a $550 MSD etc…

Is it the payment including tax or without and in my case both payments were under 500 (barely) with tax included? Maybe an oversight on dealers part?