A commercial/business umbrella is similar to a personal umbrella as it goes over the top of your other business insurance policies.
The primary purpose of this policy is to protect the assets and future income of the business owner from lawsuits that exceed the limits that are provided on other liability policies of the business.
Since this is a catastrophic liability coverage it will respond after the initial coverage from your business auto liability, commercial general liability and employers liability policies have been utilized. The policy comes with coverage limits starting at one million dollars and typically increases in one million dollar increments. Most umbrella policies come with a retention limit which is a dollar amount similar to a deductible that is the responsibility of the insured.