Property tax rates in 2012-14 were set by the school board at 20.3700 mills. A mill is $1 of tax for every $1,000 of a property's assessed value. Allegheny County underwent a property reassessment which caused the millage to be reduced to avoid the Districts gaining a windfall. Irregular property reassessments have become a serious issue in the commonwealth as it creates a significant disparity in taxation within a community and across a region. Property taxes, in the Commonwealth of Pennsylvania, apply only to real estate - land and buildings. The property tax is not levied on cars, business inventory, or other personal property. Certain types of property are exempt from property taxes, including: places of worship, places of burial, private social clubs, charitable and educational institutions and government property. Additionally, service related, disabled US military veterans may seek an exemption from paying property taxes. 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 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.