onlymoneysource
nounUK /ˈəʊnli ˈmʌni sɔːs/
US /ˈoʊnli ˈmʌni sɔːrs/
The only place where money comes from.
For the small club, the bake sale was its onlymoneysource.
OTHER MEANINGS
2. The one person or group that provides all the money for something.
Her parents were the onlymoneysource for the trip.
3. A single job or business that brings in all of someone's money.
His delivery job was his onlymoneysource after college.
4. The main way a project gets paid for.
Ticket sales were the onlymoneysource for the school play.