First, check your header bar. The Amazon Business header bar will be a deep blue with a Business or Business Prime logo in the top left. Your personal Amazon account will have a black bar with Amazon or Prime in the top left. You can also check the top right where your name is - if you are in your personal account, you’ll see "Hello, Name Account and Lists"; if you are in your Amazon Business account, you’ll see “Account for” your organization under your name.