As we know, our tax structure is not ideal; it's far from it. All companies have an obligation to keep their costs as low as they can; and that includes taxes. But some companies can take advantage of loopholes in our system, loopholes which, in general, are the result of lobbying by the companies.
Here are some examples. Note that the percent is the sum of federal, state, local and foreign taxes. AT&T - 18%, General Electric - 18%, Coca-Cola, Apple and IBM - 17%, Alphabet (Google’s parent) - 16%, Amazon - 13%, Boeing - 8%, Facebook - 4%.