Why does the CBO construct a cyclically adjusted budget deficit for the purposes of monitoring federal income and outlays?

The congressional budget office (CBO) constructs the cyclically adjusted budget deficit for the purpose of monitoring federal income and outlays to know deficit, which in turn depends upon the gross domestic product, economic activity, and variation in the fiscal policy. The CBO first evaluates the potential output at GDP at the time of full employment. The revenues and the outlays of the federal government are evaluated at the potential gross domestic product in the economy. The subtracting of the revenue from the outlays is equal to the deficit. When the potential output is the same as the actual output, the government is at a deficit.