The problem with estimating the net worth of the Catholic church is that an overwhelmingly large fraction of its wealth is in buildings (the many churches it owns throughout the world), real estate (the land those churches are built on, plus the Vatican), and art. That said, this article (http://www.zenit.org/article-1900?l=english) gives some indication of the magnitude of their income/expenditures.

Note: Most of the figures in the attached article are in lire, with a conversion rate of 2000 lire to 1$US--the annual in and outflow of the Catholic church is on the order of hundreds of millions of $US; it is only their total assets that are on the order of trillions.