Banks, credit card organizations, and other financial establishments that provide lending or credit service are doing the business to make a profit. Such businesses have finance charges as their main source of income.
These finance charges are applied on providing mortgage loans, credit cards, lines of credit, and any other finance facility that could be provided to the potential borrowers.
A flat fee is also considered a finance charge. These kinds of finance charges incorporate things like yearly fees for credit cards, account maintenance charges, late charges charged for making a delayed monthly payment on a loan, and record exchange charges.
In the case of mortgage loans, the finance charge is for the interest rate amount which is charged by the lender plus the flat fees like loan application charges, appraisal fees, origination charges, title charges, etc.