The current St. Clair property tax bill is for services provided by all of the taxing districts listed on the top portion on the front of your tax bill.
 
The county assessor sets an assessment on your land and building.  The county assessor considered sale figures from three years: 2011, 2012, and 2013. This is Illinois law.
 
The assessment determines the Local Value, which is listed seven lines down in the left-hand column on the front of your bill.
 
The exemptions for which you successfully have applied then are subtracted from the Local Value.  The result is the Taxable Value.  All of these can be found in the left-hand column.
 
Finally, the Taxable Value is multiplied by the Tax Rate.  The Tax Rate is listed above the Total Tax Due.  The Tax Rate is the sum of the individual tax rates of all the units of government listed under the Taxing Body section of your bill.  These tax rates are derived from the tax levies adopted by the elected officials of each individual taxing district.

The Tax Due is what you owe, the first half is due on or before June 29, 2017; the second half is due on or before August 29, 2017.