STATE LAW – COLORADO LIBRARY – GUIDE 13
Borrowed, Loaned & Rental Vehicles
When the driver does not own the vehicle, the first insurance card is rarely
the whole analysis. Identify ownership, permission, trip purpose and every policy
before deciding who is insured, which carrier pays first, or whether the crash
has become an uninsured-motorist problem.
Rule at a Glance
When the driver does not own the car, build the coverage map before the priority argument
Borrowing changes the factual relationship among driver, vehicle and insurance.
Start with the people and contracts before relying on any slogan about which policy “follows” what.
Identify owner
Title, registration, rental, lease or business control.
Identify driver
Named insured, relative, borrower, employee, renter or additional driver.
Establish permission
Express, implied, restricted, revoked or disputed.
Identify purpose
Personal, temporary substitute, work, delivery, rideshare or rental.
Find every policy
Owner, driver, employer, rental, commercial, umbrella and UM/UIM.
Read priority clauses
Primary, excess, escape, contribution and exhaustion terms.
permission, ownership, purpose and coverage source are separate fact tracks.
The existing Clean Claim curriculum correctly tells users to keep them separate
until the coverage map is complete.
Colorado Law
Colorado private-passenger insurance expressly recognizes permissive users
Under C.R.S. § 10-4-601(5), an “insured” includes a person using the described
motor vehicle with the permission of the named insured. But the existence and
scope of permission still must be established.
“You may use my car.”
Direct oral or written authorization is the cleanest permission evidence.
Preserve texts, emails and contemporaneous statements.
Conduct can matter
Prior borrowing practice, owner knowledge, key access and household custom
can bear on whether permission reasonably existed.
Permission can have boundaries
One trip, one day, personal use only, no delivery, no third driver, no
out-of-state travel or another stated restriction can become coverage facts.
Section 10-4-630 allows a complying policy to exclude claims arising from a
specifically excluded driver’s operation even where another insured gave that
excluded driver permission.
Colorado Law
Current Colorado law asks whether the borrower crossed into “converter” status
This is where older summaries of Colorado permissive-use law can become misleading.
The modern statute expressly addresses use that becomes unauthorized or goes
beyond the scope of permission.
| Question | Current statutory inquiry |
|---|---|
| Was use unauthorized? | Would a reasonable person determine that the operation or use was unauthorized? |
| Was the scope exceeded? | Would a reasonable person determine that the use went beyond permission given by the named insured or resident relative? |
| How long was control retained? | Section 10-4-601(3) expressly identifies duration of control as a factor. |
| What were the circumstances? | The surrounding conduct and circumstances of the operation are expressly relevant. |
| Was there good faith? | The user’s good-faith belief in legal entitlement is part of the statutory analysis. |
Wiglesworth and Raitz arose under Colorado’s former
No-Fault Act and are still useful history, but their broad initial-permission rule
should not be quoted as though nothing changed in 2003. The current converter
definition in § 10-4-601(3) expressly includes operation beyond the scope of permission.
applying the post-no-fault statutes, the federal court concluded that the former
initial-permission rule had been superseded and applied the objective converter
standard. This is persuasive federal authority, not a controlling Colorado appellate decision.
Colorado Law
The driver’s own policy may add non-owned-auto coverage — but occasional borrowing matters
Personal auto policies commonly extend some liability protection when the named
insured drives a vehicle he or she does not own. The exact definition, permission
requirement, regular-use exclusion and other-insurance clause control.
Classic non-owned-auto situation
A friend’s vehicle borrowed for a discrete trip may fit ordinary non-owned
coverage, subject to the policy’s actual language and permission requirements.
A second car in practice can be different
Company cars, roommate vehicles, family cars kept at the house and long-term
loans can implicate exclusions for vehicles furnished or available for regular use.
Disabled owned vehicle may trigger another definition
A short-term replacement while an insured vehicle is being repaired can be
treated differently from a general borrowed or regularly available vehicle.
the Colorado Court of Appeals treated the ability to obtain a vehicle only after
requesting keys and specific permission each time as inconsistent with the vehicle
being broadly “available” for frequent or regular use under that policy.
actual ownership matters. A vehicle owned through the insured’s sole proprietorship
could not be converted into a “non-owned” auto merely by using a business trade name.
Colorado Law
Colorado does not automatically make the owner’s insurer primary
The strongest modern authority is Shelter Mutual v. Mid-Century.
Colorado’s mandatory-insurance statutes require coverage to exist; they do not
dictate that the vehicle owner’s insurer must always pay before the driver’s insurer.
| Owner policy | Driver policy | Potential result |
|---|---|---|
| Primary | Excess for non-owned autos | Owner policy may pay first under the contracts. |
| Excess | Primary | Driver policy may pay first if the clauses validly create that order. |
| Excess | Excess | Conflicting clauses may be mutually repugnant; Shelter treated the policies as co-primary. |
| Coverage denied by one policy | Coverage accepted by another | Do not stop at the first position; analyze whether the denial is valid and whether other layers remain. |
the father owned and insured the borrowed vehicle; the son had his own personal
policy covering him as a non-owner operator. Both insurers used excess clauses.
Colorado’s Supreme Court held there is no statutory owner-policy-primary rule;
because the two excess clauses conflicted, both carriers were co-primary.
Shelter refused to enforce the reduction in that case because the insurer failed
to give adequate notice of the reduced permissive-user limit on renewal. Current
Regulation 5-2-17 requires conspicuous disclosure of a private-passenger step-down provision.
Colorado Law
A dealer or repair-shop loaner can involve a different policy architecture
A service-department loaner is not automatically governed by the same policy
structure as borrowing a friend’s personal car.
Read the driver’s authorization
Identify who may operate the loaner, permitted use, return date, geographic
restrictions and any insurance representations.
Obtain the commercial contract
Section 10-4-608(1)(d) exempts garage, automobile sales, repair-shop,
service-station and similar operation-hazard policies from Part 6’s private-passenger framework.
Non-owned coverage may still matter
Obtain the driver’s policy and compare its non-owned-auto and other-insurance
provisions with the dealer/garage policy.
obtain the repair order, loaner agreement, dealer/garage declarations and policy,
driver’s policy, permission record and every coverage-position letter before deciding priority.
Colorado Law
Rental vehicles require their own contract-and-insurance audit
Colorado’s legislature has deliberately separated motor-vehicle rental agreements
and rental-company insurance products from much of the ordinary private-passenger
Part 6 framework.
| Item | What it generally does | What to obtain |
|---|---|---|
| Rental agreement liability protection | Defines contractual liability protection, authorized drivers and allocation of rental risks. | Complete signed rental agreement and incorporated terms. |
| Supplemental liability insurance | May increase third-party liability protection under a separate insurance policy. | Election, certificate/policy, insurer name, limits and claims administrator. |
| Supplemental UM/UIM product | May provide first-party occupant protection if purchased under the operative supplemental policy. | Actual supplemental policy, insured definition, limits and exclusions. |
| Loss/collision damage waiver | Generally allocates responsibility for physical damage to the rental vehicle; not the same as third-party liability insurance. | Waiver election and contractual exclusions/conditions. |
| Driver’s personal auto policy | May provide non-owned/rental liability, physical-damage or other coverage depending on the form. | Declarations, full policy, non-owned/rental and other-insurance clauses. |
| Credit-card rental benefits | May provide limited property-damage or related benefits subject to card terms and payment requirements. | Benefit guide, reservation/payment record and claim requirements. |
C.R.S. § 10-4-609(1)(b) states that the ordinary subsection requiring UM/UIM
coverage unless rejected does not apply to motor-vehicle rental agreements or
rental companies. Determine what was actually purchased rather than assuming
the renter received the same UM/UIM structure as a personal Colorado auto policy.
where renters purchased supplemental insurance provided through a third-party
insurer, the Colorado Supreme Court held that the rental company itself did not
become the statutory or common-law insurer. The operative insurer remained the
insurer named on the supplemental policy.
Colorado Law
The Graves Amendment blocks pure rental-owner vicarious liability — not every claim against a rental company
Federal law limits state-law claims that attempt to impose liability on a
commercial rental or leasing company merely because it owns the vehicle.
Ownership alone
49 U.S.C. § 30106 generally bars vicarious liability based solely on the
rental/leasing company’s ownership when statutory conditions are met.
Owner’s own negligence
The statute expressly does not immunize negligence or criminal wrongdoing
committed by the rental/leasing owner or affiliate itself.
Financial-responsibility law
Graves does not supersede state insurance/financial-responsibility standards
within the federal statute’s express savings provisions.
Any direct-negligence theory against a rental company needs facts supporting the
company’s own conduct — not simply the renter’s negligence plus the company’s title to the car.
Colorado Law
A private vehicle owner can have independent liability for negligent entrustment
Permission may create insurance coverage. Negligent entrustment is a different
tort question: did the person controlling the vehicle supply it to someone the
supplier knew or should have known was likely to use it dangerously?
| Element / issue | Colorado inquiry |
|---|---|
| Supply / permission | Did the owner or other person with control supply or permit use of the vehicle? |
| Control | Did the alleged entrustor possess the vehicle or have the right to control its use at the time of entrustment? |
| Knowledge | Did the supplier know or have reason to know the driver was likely, because of youth, inexperience or other circumstances, to use it dangerously? |
| Unsafe use | Did the entrusted driver’s conduct create the unreasonable risk that caused the injury? |
| Causation / damages | Did the negligent entrustment cause legally compensable injury? |
Colorado recognizes negligent entrustment based on Restatement principles.
The tort is based on the supplier’s own negligent entrustment, not automatic
vicarious responsibility for the driver’s negligence.
Later Colorado authority such as Beasley v. Best Car Buys cautions
that lack of a driver’s license, standing alone, does not necessarily establish
that the supplier knew or should have known the person was an unsafe driver.
Citizen Workflow
Borrowed / rental vehicle evidence checklist
a borrowed vehicle may be borrowed, rented, hired, employer-provided, a temporary
substitute, regularly available, used without permission or used for business.
The current curriculum correctly tells citizens not to assume that “borrowed”
answers the insurance question.
Important Legal Rules & Cases
Colorado borrowed and rental vehicle authority map
Owner policy not automatically primary
Current tort-system authority holding that Colorado mandatory-insurance law
does not impose a vehicle-owner-policy-primary rule; competing excess clauses
were mutually repugnant and the two policies became co-primary.
Colorado Supreme Court · core priority authority
Rental supplemental insurer identity
Current Colorado Supreme Court authority holding that a rental company does
not itself become an insurer merely by offering supplemental insurance supplied
under a third-party insurer’s policy.
Colorado Supreme Court · current 2026 authority
Regular-use / non-owned auto
Useful policy interpretation authority distinguishing a truly available
regular-use vehicle from one requiring keys and specific permission each time.
Colorado Court of Appeals
Actual ownership controls
A vehicle owned through the insured’s sole proprietorship was not a
“non-owned” automobile under the driver’s personal policy.
Published Colorado Court of Appeals
Negligent entrustment
Expressly adopts negligent entrustment in Colorado under Restatement § 308
principles; liability is based on the supplier’s own negligence, not vicarious liability.
Published Colorado Court of Appeals
Supplier/control framework
Colorado Supreme Court authority applying Restatement §§ 308 and 390 to
negligent entrustment and focusing on control plus knowledge of foreseeable misuse.
Colorado Supreme Court
Historical initial-permission cases
Important historical Colorado No-Fault Act cases, but the post-2003 statutory
converter definition requires current-law qualification before using their broad rule.
Historical statutory context · do not overstate
Modern converter analysis
Federal court applying Colorado law concluded the former initial-permission
rule was superseded by §§ 10-4-601(3) and 10-4-623’s converter framework.
Federal persuasive authority
Rental/driver competing excess clauses
Historical rental-car authority whose other-insurance reasoning was later
expressly carried into Colorado’s current tort system by Shelter Mutual.
Colorado Supreme Court · historical rental context
Related Guides & Resources
VictimsGuide resources supporting Guide 13
Colorado Law
Borrowed / rental vehicle coverage worksheet
| Field | Record | Coverage question |
|---|---|---|
| Vehicle owner | __________ | Who held title or rental/lease rights? |
| Driver | __________ | Named insured, relative, borrower, employee or renter? |
| Permission source | __________ | Who authorized operation? |
| Permission scope | __________ | Any time, place, driver, purpose or duration limits? |
| Converter issue | __________ | Would a reasonable person view the actual use as unauthorized/beyond scope? |
| Owner policy | __________ | Does it insure this driver and at what limit? |
| Driver policy | __________ | Does non-owned/temporary-substitute coverage apply? |
| Regular-use issue | __________ | How often and how freely was the vehicle available? |
| Other-insurance clauses | __________ | Primary, excess, escape or pro-rata? |
| Named-driver exclusion | __________ | Is the actual operator specifically excluded? |
| Trip purpose | __________ | Personal, work, delivery, rideshare or mixed? |
| Dealer/loaner policy | __________ | Does a garage/commercial policy apply? |
| Rental agreement | __________ | Who is authorized and what protection was included? |
| Supplemental rental insurance | __________ | Who is the actual insurer and what limits/products were purchased? |
| Damage waiver | __________ | What rental-vehicle physical-damage obligations were waived? |
| Employer/commercial policy | __________ | Does work use add hired/non-owned or other coverage? |
| Umbrella/excess | __________ | What attachment/exhaustion requirements apply? |
| UM/UIM | __________ | What first-party protection remains if liability coverage fails? |
when the driver does not own the vehicle, do not ask only “whose insurance?”
Ask who owned it, who permitted it, how it was being used, what every contract
says, which insurer is primary or excess, and what other coverage survives.
Frequently Asked Questions
Frequently asked questions
If I lend my car to a friend, is the friend automatically insured under my Colorado policy?
Colorado’s private-passenger statutory definition of “insured” includes a
person using the described vehicle with the named insured’s permission. But
named-driver exclusions, converter status, policy conditions, limits and the
particular policy must still be checked.
Does Colorado still use the old rule that initial permission covers every later deviation?
Do not assume so. Wiglesworth and Raitz arose under the former No-Fault Act.
Current § 10-4-601(3) expressly defines a converter to include objectively
unauthorized use or operation beyond the scope of permission and requires a
fact-specific good-faith analysis.
Is the vehicle owner’s insurance always primary over the borrower’s insurance?
No. Shelter Mutual expressly rejected a mandatory owner-policy-primary rule
under Colorado’s current tort system. Read both policies’ other-insurance clauses.
Can my own policy cover me while I drive a friend’s car?
Often a personal policy provides liability coverage for qualifying non-owned
autos, but the policy may contain permission, regular-use, business-use or
other exclusions and may state that its coverage is excess.
What if I borrow the same car every day?
A regular-use exclusion may become important. Frequency, key access, duration,
control, where the vehicle is kept and whether permission must be obtained for
each use are all relevant under the policy.
Is a dealer loaner treated exactly like a friend’s personal car?
Not necessarily. Dealer, garage and repair-operation policies are expressly
outside portions of Colorado’s ordinary private-passenger Part 6 framework.
Obtain the loaner agreement, garage/dealer policy and driver’s personal policy.
Does a Colorado rental company have to offer ordinary UM/UIM like my personal auto insurer?
Section 10-4-609(1)(b) says the ordinary mandatory UM/UIM-offer subsection
does not apply to motor-vehicle rental agreements or rental companies.
Determine what supplemental coverage was actually purchased.
If Hertz sells supplemental insurance, is Hertz itself my insurer?
Not merely for that reason. Hertz v. Babayev, 2026 CO 26, holds that a rental
company offering supplemental insurance supplied by a third-party insurer is
not thereby transformed into the statutory or common-law insurer.
Can I sue a rental company just because it owned the rental car involved in the crash?
The Graves Amendment generally bars liability imposed solely because a
commercial rental/leasing company owns the vehicle, if its statutory conditions
apply. It does not immunize the company’s own negligence or criminal wrongdoing.
What if the liability insurer denies the borrowed driver was covered?
Get the written coverage position, owner’s policy, driver’s policy and permission
evidence. Then evaluate other owner/employer/commercial coverage and promptly
preserve the injured person’s UM/UIM rights.
Primary Authorities
Primary authority map
Borrowed, Rented & Shared Vehicles
Trace the owner, permission, regular use, and every policy attached to the transaction
A borrowed or rented vehicle can involve several overlapping insurance relationships. Do not assume that the driver’s card identifies the only policy.
Owner policy
Identify the policy covering the vehicle and whether the driver had permission.
Driver policy
Determine whether non-owned-auto coverage applies and whether regular-use or household-vehicle provisions are implicated.
Rental or sharing coverage
Review the rental agreement, supplemental products, vehicle-sharing platform coverage, and any applicable statutory scheme.
Other layers
Investigate employer, umbrella, excess, and contractual coverage when the trip or vehicle relationship creates those leads.