Property income is tax-able in most of the countries including Pakistan.
[2] Property income is nominal revenues minus expenses for variable inputs (labor, purchased materials and services).
Capitalist economic systems are usually defined as those systems where the means of production are privately owned through equity, stock, bonds or privately held by a group of owners who bear the risk of investment and production to generate returns.
In Marxian economics and related schools, property income is a portion of the surplus value produced by an economy, where "surplus value" refers to value beyond what is needed for subsistence.
One economic perspective is to bring productive property under public ownership so that each citizen would receive a share of the property income in addition to their normal wage or salary (see: Social dividend).