Zurich has warned businesses that premiums for employers' liability insurance will increase if the government increases the official retirement age.
Zurich said that if Britons start working beyond the age of 65, it would have a knock on effect for insurance.
Zurich's commercial head of business operations Dave Smith said: "One of the major and often most expensive parts of an EL claim is the amount set aside for future wage loss.
"If people work longer this sum will rise sharply because more years have to be funded."
