The Youtube video I was going to link to has been taken down but it's an interview with Jordan Maxwell about his association with the JWs in the late 1960s. He was privileged to attend a dinner invite with some of the members of the Governing Body. Among them was the JW Treasurer.
Jordan asked him, how do you finance your work? Your yearbook says you spent millions of dollars on missionaries yet the people who live in this part of California are poor.
The JW told him that they have two open accounts, one with Chase and another bank in Pennsylvania. Jordan asks him "What do you mean open accounts?" and he replied that whatever their expenses are, the bank just covers it in full. This is not a loan. It seemed the banks were financing the JW organization.