Rental cars, borrowed cars and who covers what

Driving a vehicle you do not own creates coverage questions that most people resolve at a rental counter under time pressure.

Your own policy and rental cars

Most personal auto policies extend coverage to a rental vehicle used for personal purposes, at the same limits and with the same deductibles as your own vehicle.

Which means if you carry liability, comprehensive and collision, you generally have that coverage in a rental.

Important qualifications.

If you do not carry collision on your own vehicle, you generally have no collision coverage on the rental.

Coverage typically does not extend to business use in some policies, or to rentals outside the country — coverage in another country frequently requires separate arrangements, and rentals abroad are usually not covered by a domestic policy.

Certain vehicle types may be excluded — large trucks, exotic vehicles, vehicles above a weight or value threshold.

And your deductible applies, so a claim means paying it.

Loss of use and administrative charges

The gap that catches people.

Rental companies charge for loss of use — the revenue lost while the vehicle is repaired — plus administrative fees and sometimes diminished value.

Many personal auto policies do not cover loss of use, or cover it only to a limited extent.

Which means you can have collision coverage that pays for the damage and still owe several hundred dollars in charges the policy does not address.

Check your policy language on this specifically. Some insurers offer an endorsement.

The rental counter products

Collision damage waiver or loss damage waiver. Not insurance — a contractual agreement by the rental company not to hold you responsible for damage.

Its advantage is comprehensiveness and simplicity: it typically covers loss of use and administrative charges, and it avoids a claim on your own policy, which avoids a deductible and a potential rating impact.

Its disadvantage is cost, which is substantial per day.

Note that it can be voided by conduct — driving on unpaved roads, driving outside permitted areas, allowing an unauthorized driver, or driving under the influence. Read the conditions.

Supplemental liability protection. Additional liability coverage above the minimal amounts the rental company provides.

Worth considering only if your own liability limits are low, or if you have no auto policy.

Personal accident and personal effects coverage. Generally duplicative of health insurance and homeowners or renters coverage.

Credit card coverage

Many credit cards provide rental car coverage when the rental is paid with the card and the counter waiver is declined.

Two types.

Secondary coverage, the more common, which pays only after your own insurance. Useful for the deductible but requiring a claim on your policy first.

Primary coverage, offered by some premium cards, which pays without involving your own insurer.

Primary coverage is genuinely valuable because it avoids a claim on your record.

Read the benefit guide, not the marketing summary. Common exclusions include: certain countries; rentals beyond a maximum duration, frequently fifteen or thirty days; certain vehicle categories including trucks, luxury and exotic vehicles; and loss of use in some programs, though many now include it.

You must generally decline the counter waiver entirely for the benefit to apply, and pay the full rental with the card.

Renting without your own auto policy

If you do not own a car and have no policy, you have no coverage extending to a rental.

In that situation, purchasing the counter products is generally sensible, or obtaining a non-owner auto policy if you rent frequently.

A non-owner policy provides liability coverage when driving vehicles you do not own, is inexpensive, and also maintains continuous insurance history — which matters if you buy a car later.

Borrowing a friend's car

The general principle is that insurance follows the vehicle.

The owner's policy is generally primary for a permissive driver. Your own policy, if any, may provide excess coverage above the owner's limits.

Which means: if you borrow a car and cause an accident, the owner's insurance responds first, their limits are exposed, and their rates may be affected.

Two practical consequences.

Before lending a vehicle, consider whether the borrower is a competent driver, and be aware that a claim affects your policy.

Before borrowing, ask what liability limits the owner carries, since you are relying on them.

Note also that regular use of a vehicle by a household member who is not listed on the policy can result in a coverage dispute. Household members should be listed.

The decision at the counter

Before you travel, check three things.

Does your auto policy extend to rentals, at what limits, with what deductible, and does it cover loss of use?

Does your credit card provide primary or secondary coverage, and what are the exclusions?

Are you renting outside the country, in which case domestic coverage generally does not apply?

With those answers, the counter question takes ten seconds.

General information about insurance coverage, not insurance or legal advice. Policy terms, card benefits and rental agreements vary. Verify your own coverage before relying on it.