Pennsylvania school district revenues are dominated by two main sources: 1) Property tax collections, which account for the vast majority (between 75-85%) of local revenues; and 2) Act 511 tax collections, which are around 15% of revenues for school districts. When a Pennsylvania public school district includes municipalities in two or more counties, each of which has different rates of property tax assessment, a state board equalizes the tax rates between the counties. In 2010, miscalculations by the State Tax Equalization Board (STEB) were widespread in the Commonwealth and adversely impacted funding for many school districts, including those that did not cross county borders.