Unfortunately, most of the time, the authorization of an additional driver, also comes hand-in-hand with a charge for a second driver. (Some car rental companies do not charge an additional driver fee for a spouse, life partner, common-law spouse or a fellow employee (when on a business rental). Some companies charge for any extra driver, other than the renter.

There are two schools of thought on WHY the car rental companies charge for a second driver.

1) Because they can. Many people feel that there is no actual reason for the extra charge; it's just a way for the car rental company to make more money. See this article, for example: 5 New Car Rental Fees to Avoid, by Christopher Elliott

2) The extra additional driver fee is a way for the car rental companies to recoup the costs associated with having multiple drivers on their cars. The car rental companies, by law, must carry basic public liability and property damage coverage, up to the minimum limits required by law, on every vehicle in their fleet.

I searched for the answer to your charge for a second driver question, with several car rental companies. I did get a response from Rob White, who is the Marketing Manager for Avis UK, and a moderator for the Avis We Try Harder blog.

Here is my question and his response:

Paula

July 22nd, 2009 at 5:00 pm

I was wondering exactly why Avis charges for an additional driver other than a spouse or life partner in the US. I’ve heard that is has something to do with liability insurance.

As the renter, I’m fully responsible for any damage caused to the car, whether I’m driving it or not. I can understand that all additional drivers need to be authorized and listed on my contract… but why the extra fee? Thanks!

Rob White- Marketing Manager, Avis UK

July 23rd, 2009 at 5:57 pm Hi Paula, one reason is, as you mention, because of the additional risk with multiple drivers, which has the potential for more driver miles and higher risk of incident. This is similar to other motor insurance policies where additional drivers can increase the premium.

Also the charge covers the administration involved in validating more than one license and listing on the contract.

Rob