MC number will give you authority to operate in interstate commerce. Once you’ve filed, you will get your MC number immediately, but it is not active yet.
You’ll have 20 days to complete your BOC-3 and get an insurance policy on your file. Once those are filed with the FMCSA, your MC authority will become active within two to three weeks. About two weeks after that, you will receive your authority certificate in the mail.
It is important to note that you cannot legally drive your truck until you’ve filed your BOC-3 and insurance policy. You will also need to wait until your MC number goes active.