When is 'income' countable and uncountable? Can you please give some sample sentences? Thank you!?

"Countable income" is a phrase usually associated with the SSI program. Cash income is countable, but certain "exclusions" are available, such as the first $65 earned in any month, plus one half of the remainder of your earned cash income. Income "in kind" may or may not be countable: if it is food or shelter, it is countable. For example, if you do some work at the place where you are living, and therefore receive some reduction of your rent, that reduction is countable income, but is subject to the exclusion mentioned above.

It's countable whenever it does not exceed the number of rational numbers on the entire real number line.

(You asked in the Math section :P)