The firm, which specializes in loans to people who usually need to borrow less than £500 and pay it back in weekly installments, posted a 2.4 per cent drop in full-year pretax profit of £125.7m.
Analyts had penciled the company for profits of £151.45m.
The group in a statement: "Existing customers exhibited increasingly cautious behaviour during 2009 which tempered demand for credit and was exacerbated by the adverse weather conditions during the peak trading weeks in December.
"Cautious consumer behaviour is expected to persist through 2010, resulting in relatively modest growth in receivables. As a result, there will be a strong focus on cost efficiency."
The company previously said that it had slowed the rate of new customer growth in 2009 at its Consumer Credit Division and that it will continue its cautious approach to lending until unemployment stabilises.
The group, which raised £160m for organic growth at the end of 2009, said customer numbers grew 5.4 per cent to 2.3m 2009.