The couple, who have two-year-old daughter North and two-month-old son Saint together, have separate accounts, reported People magazine.
"They make a lot of money, and money is not a problem with them. They keep their accounts basically separate. (He'll) talk about 'my money' and 'her money.'," a source said.
The rapper recently asked Facebook founder Mark Zuckerberg for USD 1 billion after announcing he has USD 53 million in "personal debt".