The Vatican receives one tenth to one fifth of monies received by lower levels of the church hierarchy. German Catholics have been funding the church through income taxes since the early 20th century; according to tax data the current yearly amount is about 5 billion dollars.
In America donations at the parish level on up amount to over 6 billion a year. Total global annual revenues must be in the tens of billions. The bulk of the assets received by the Holy See probably reside in accounts of the Institute per le Opero di Religione (IOR), or the Institute for Religious Works, commonly known as the Vatican Bank, which does not release information on its holdings and investments.
http://churchandstate.org.uk/2016/02/the-understold-story-the-vatican-the-mob-super-ponzi-schemes-and-more/