I was told in the early 2000's of one refinery that made 300 million dollars per day. This included weekends and holidays. The petrochemical industry is by no means poor, but they are allowed to take advantage of federal tax breaks. Each refinery is its own corporation, not part of a huge group. All the salaries, equipment and maintenance are written off as expenses. Before long, all that is (allegedly) left is an amount less than 25 million per year. This is good enough to qualify as a "small business," thus not requiring them to pay federal income tax.