New York Times:

Apple’s headquarters are in Cupertino, Calif. By putting an office in Reno, just 200 miles away, to collect and invest the company’s profits, Apple sidesteps state income taxes on some of those gains.California’s corporate tax rate is 8.84 percent. Nevada’s? Zero.Setting up an office in Reno is just one of many legal methods Apple uses to reduce its worldwide tax bill by billions of dollars each year.