Can a 20 year old be a secondary driver on a rental car?

[AnnieAnn]

Yes, a 20-year-old can typically be added as a secondary driver on a rental car in California, but it is not a universal guarantee and involves specific conditions and costs. The ability to add them depends entirely on the rental company’s policy, the vehicle category selected, and the secondary driver passing the same identification and credit checks as the primary renter.

The primary hurdle is the underage driver fee. Most major rental companies like Enterprise, Hertz, and Avis set the minimum age for renters at 20 in California, but drivers under 25 incur a daily Young Renter Fee. This fee also applies to additional drivers under 25. Industry data indicates this fee typically ranges from $15 to $30 per day, which can significantly increase the total rental cost. Some premium or luxury car groups may have a higher minimum age requirement of 25, automatically excluding younger drivers from being added to those reservations.

The process is not automatic. The primary renter must physically accompany the secondary driver to the rental counter. Both must present valid driver’s licenses, and the secondary driver’s license must meet the same criteria (e.g., not be provisional or probationary). The rental agent will run a check on the additional driver’s credentials. Some companies may also require the secondary driver to be present on the credit card used for the rental.

It is critical to declare all additional drivers. If an undeclared 20-year-old drives the rental car and is involved in an incident, the rental company’s insurance and any protection products you purchased may be voided, leaving you fully liable for all damages.

Consideration	Typical Requirement / Impact
Minimum Age for Secondary Driver	20 years old (in California; varies by state/country).
Underage Driver Fee (for under 25)	$15 - $30 per day, added to the rental cost.
Mandatory In-Person Add-on	Both primary and secondary drivers must be present at the counter with ID.
License Requirements	Valid, non-provisional driver‘s license from an approved country/state.
Vehicle Class Restrictions	May be prohibited for luxury, sports, or premium vehicle categories.

To ensure success, you must proactively disclose your intent to add a young secondary driver when booking. Contact the rental location directly after making a reservation to confirm their specific policy and fee structure. Comparing policies across different rental brands can help you find the most cost-effective option for your situation.

[LouisDella]

As a dad who’s rented cars for family trips with my college-age kids, here’s the real deal. You can add your 20-year-old, but you have to plan for it. Call the rental office ahead of time—don’t just show up. They’ll tell you the daily “young driver” fee, which is like an extra $20 a day on top of everything else. Both of you need to go to the counter with your licenses. My advice? Factor that extra fee into your budget. It stings, but it’s cheaper than the nightmare of having insurance denied because your kid drove without being on the contract.

[AdrianaAnn]

I worked at a rental counter for three years, and this was a daily question. The system literally will not let us add a driver who doesn’t meet the age and license rules. In California, yes, 20 is old enough to be added. But the computer prompts us to apply the under-25 surcharge automatically. The biggest issue? People book a “sports car” or a fancy SUV for a graduation trip, not realizing those vehicle categories often block any driver under 25 entirely. Always, always mention the young additional driver when you book. It saves a huge argument at the counter when we can’t fulfill a request that was never possible to begin with.

[StJohn]

Trying to split driving on a road trip? If one of you is 20, here’s your checklist:

1. Book with a major company (Hertz, Enterprise, etc.) in California. Avoid smaller brands; their rules are stricter.
2. Be ready to pay more. A daily young driver fee is non-negotiable.
3. You both must show up. No adding someone over the phone or via an app later.
4. Bring the right license. No temporary permits.
5. Stick to standard economy or midsize cars. Fancy upgrades might not be allowed. Do this, and you’ll be set. Skip a step, and you risk being turned away.

[GiselleLynn]

My experience adding my 20-year-old brother last summer was straightforward but pricey. We rented from an airport location in Los Angeles. I booked online and called the branch directly the next day to confirm I could add him. The agent was clear: a $22 per day fee, and we both had to be there. At the counter, it took about 10 extra minutes. They examined both our licenses, had him sign the contract, and added the fee to the total. The process was smooth because we were prepared. The cost added nearly $150 to our week-long rental, which hurt the budget. For our next trip, we’re comparing companies to see if any have lower daily fees for additional drivers, even if the base rate is slightly higher. The transparency upfront was key—no surprises.