From The Duchy Of Cornwall
As the Duke of Cornwall, Prince Charles gets an allowance of sorts courtesy of the Duchy of Cornwall. In the 14th century, the territory was made by Edward III. This covers a span of 131,000 acres of properties and land, which is all quite impressive. On top of this, the duchy also has its own investment portfolio.
For His Public And Private Enterprises
Prince Charles receives a budget from the duchy to pay for his different private and public enterprises. Among other things, his charities would fall under these. He can also use the fund to lend a hand to his close family members. We are pretty much referring to his own kids and grandchildren by saying that.