If you want to renew a registration online, you can do so and print a 10 day document to use until your new registration arrives in the mail.  However, you cannot do this if your vehicle has been altered or stretched to increase the number of passengers or if there are other special circumstances.
Where do I need to register vehicles owned by my business?
You must register any vehicle owned by your business at a DMV office.
Where do I place my registration sticker?