Small companies have been copying a method to control insurance costs and reduce taxes that used to be the domain of large businesses: setting up their own insurance companies to provide coverage when they think that outside insurers are charging too much.

Often, they are starting what is called a "captive insurance company" - an insurer founded to write coverage for the company, companies or founders. 

Here's how captive insurers work.

The parent business (your company) creates a captive so that it has a self-funded option for buying insurance, whereby the parent provides the reserves to back the policies. The captive then either retains that risk or pays reinsures to take it. The price for coverage is set by the parent business; reinsurance costs, if any, are a factor. 

In the event of a loss, the business pays claims from its captive, or the reinsurer pays the captive. 

http://www.hg.org/article.asp?id=35592