The Tax Foundation states that the goal of the report is to "focus lawmakers' attention on the importance of good tax fundamentals: enacting low tax rates and granting as few deductions, exemptions and credits as possible."
As might be determined from the name and mission statement, The Tax Foundation sees higher taxes as a deterrent to a healthy business climate:
From the report: "American companies often function at a competitive disadvantage in the global economy. They pay one of the highest corporate tax rates of any of the industrialized countries. The top federal rate on corporate income is 35 percent, and states with punitive tax systems cause companies to be even less competitive globally."
Predictably, highly-populated states with a density of cities (California, New York) rank low and cities where land is not at a premium (Wyoming, Alaska) rank highly.