Some 9% of accounts pay close to 80% of banks' overdraft revenue, the CFPB said.

A report released last month by the Consumer Finance Protection Bureau found that overdraft and non-sufficient funds fees remain lucrative for banks, reaching an estimated $15.5 billion in 2019.

The CFPB also said fewer than 9% of consumer accounts pay 10 or more overdrafts per year, accounting for close to 80% of all overdraft revenue.