Symbol 6
Published: October 7, 2026 · Last reviewed: October 7, 2026 · Est. reading time 9 minutes
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In plain language: Symbol 6 tells an insurance company to provide uninsured motorist coverage, but only for vehicles the business owns in states that legally require UM coverage. If a state does not mandate UM insurance, Symbol 6 provides no coverage there at all.
Technical definition: Symbol 6 is one of the numbered Business Auto Coverage Symbols on ISO form CA 00 01. It designates "owned autos subject to a compulsory uninsured motorists law," limiting the scope of uninsured motorists coverage to vehicles titled to the named insured and registered in jurisdictions with mandatory UM statutes.
Symbol 6 at a Glance
| Attribute | Detail |
|---|---|
| Also known as | Compulsory UM Symbol, Symbol 6 |
| Category | Business Auto Coverage Symbol |
| Lines of business | Commercial Auto, Business Auto Policy |
| Industries most affected | Trucking, construction, fleet operators, habitational property management with company vehicles |
| Related forms or endorsements | CA 00 01 (Business Auto Coverage Form), CA 20 48 (Uninsured Motorists Coverage endorsement where applicable) |
| Who bears the risk | The named insured, if Symbol 6 is used in a state without compulsory UM law or for vehicles registered outside compulsory UM states |
| Common solution | Use Symbol 2 (owned autos only) or confirm state-specific UM mandate before relying on Symbol 6 |
| Also interacts with | State financial responsibility laws, underinsured motorist coverage, multi-state fleet registration |
Key Takeaways
- Symbol 6 extends uninsured motorists coverage only to owned autos registered in states where UM coverage is legally required, not everywhere the business operates.
- Agencies writing fleets that cross state lines must verify each state's compulsory UM law before trusting Symbol 6 to provide consistent coverage.
- The most common pitfall is assuming Symbol 6 behaves like Symbol 2, offering blanket UM coverage on all owned autos regardless of state law.
- A reliable best practice is pulling a state-by-state UM mandate list during account rounding and cross-checking it against every vehicle's garaging state on the symbol schedule.
What Is Symbol 6 in Insurance?
Symbol 6 is a numbered designation within the Business Auto Coverage Symbols system used on the ISO Business Auto Coverage Form, CA 00 01. Insurance companies use these symbols to define exactly which vehicles trigger which coverages. Liability, physical damage, and uninsured motorists coverage can each attach to a different symbol, and Symbol 6 specifically narrows uninsured motorists coverage to owned autos operating in states with compulsory UM statutes.
The provision exists because uninsured motorist laws vary by state. Some states require insurers to offer or include UM coverage automatically. Others treat UM coverage as fully optional. Carriers built Symbol 6 to align coverage with each state's legal requirement rather than applying one uniform rule nationally, which keeps pricing and regulatory compliance consistent across a multi-state book.
Consider a landscaping company based in Georgia with a single truck registered and garaged in Alabama. Alabama has a compulsory UM law, so if the policy uses Symbol 6, that truck has UM coverage. If the same company later registers a second truck in a state without a compulsory UM mandate, that second truck has no UM coverage under Symbol 6, even though it is otherwise an identical owned auto on the same policy.
How Does Symbol 6 Work?
- The policy issuance. The carrier selects Symbol 6 on the declarations page for uninsured motorists coverage, rather than Symbol 1 (any auto) or Symbol 2 (owned autos).
- The vehicle registration. Each owned vehicle on the schedule carries a garaging state, which determines whether that state's law compels UM coverage.
- The state law check. The policy language cross-references the vehicle's garaging state against that state's compulsory UM statute at the time of loss.
- The loss event. An owned vehicle is struck by a driver with no liability insurance.
- The coverage determination. Coverage applies if the garaging state mandates UM insurance; coverage does not apply if the garaging state treats UM coverage as optional and the insured never purchased it separately.
Real Claim Examples Involving Symbol 6
Delivery van struck in a non-mandatory UM state
A regional delivery company insured under a Business Auto Policy using Symbol 6 had a van rear-ended by an uninsured driver. The van was registered in a state where UM coverage is optional rather than compulsory. The carrier denied the UM claim because Symbol 6 only triggers coverage in states with a legal UM mandate, and the insured had no endorsement adding UM coverage back for that state.
Fleet vehicle accident in a compulsory UM state
A plumbing contractor with vehicles registered in a state with a compulsory UM law had a service truck hit by a driver who fled the scene and was later confirmed uninsured. Because the truck's garaging state required UM coverage, Symbol 6 triggered full UM benefits for the injured driver and passenger. The claim paid without dispute since the symbol matched the state's legal requirement.
Multi-state fleet with inconsistent coverage outcomes
A construction firm operating trucks across three states discovered after a claim that only one of those states had a compulsory UM law. Two vehicles involved in prior minor incidents with uninsured drivers had received no UM payout, while the third received full benefits. The inconsistency triggered an E&O review of the agency's symbol selection and prompted a switch to Symbol 2 for uniform coverage going forward.
Symbol 6 vs. Symbol 2: What Is the Difference?
Symbol 6 and Symbol 2 both apply to owned autos, but they diverge sharply on when uninsured motorists coverage actually attaches. Symbol 2 provides UM coverage on every owned auto regardless of state law, while Symbol 6 provides it only where state law compels it.
| Comparison area | Symbol 6 | Symbol 2 |
|---|---|---|
| Primary use case | Single-state or limited-exposure fleets in compulsory UM states | Multi-state fleets needing consistent UM coverage |
| Coverage / concept type | Conditional, state-law-dependent UM trigger | Unconditional UM trigger on all owned autos |
| Typical exclusions | Vehicles garaged in non-mandatory UM states | None related to state UM mandate status |
| Who is most affected by errors | Fleets operating across states with mixed UM laws | Rarely affected, since coverage applies uniformly |
| Common mistakes | Assuming blanket UM coverage without checking garaging state law | Assuming higher premium without confirming broader protection is needed |
What Are the Most Common Mistakes With Symbol 6?
- Treating Symbol 6 as equivalent to Symbol 2 leads producers to promise UM coverage that does not exist for vehicles in non-mandatory states.
- Failing to track garaging state changes when a vehicle relocates creates silent coverage gaps mid-term.
- Quoting a multi-state fleet with Symbol 6 without running each state's UM mandate status invites E&O exposure when a claim is denied.
- Overlooking that compulsory UM laws can change legislatively, so a symbol selection made years ago may no longer match current law in a given state.
- Confusing uninsured motorist mandates with financial responsibility laws, which are not the same legal requirement and do not automatically trigger Symbol 6 coverage.
How to Explain Symbol 6 to a Client
Explaining Symbol 6 to a personal lines client
Symbol 6 generally shows up on commercial policies, so a personal lines client rarely needs this explanation directly. If a client asks about a family business vehicle, explain that uninsured motorist coverage on a business auto policy can depend on the state the vehicle is registered in, not just whether the business bought the coverage. Recommend they confirm with their commercial lines contact if the vehicle is used for business purposes.
Explaining Symbol 6 to a small business owner
Tell the business owner that Symbol 6 means uninsured motorist coverage only applies to company vehicles in states that legally require it. If their trucks or vans travel or are registered in multiple states, some of those vehicles might have no protection if hit by an uninsured driver. Walk through each vehicle's registered state together so there are no surprises after an accident.
Explaining Symbol 6 to a CFO or risk manager
Frame Symbol 6 as a cost-versus-coverage tradeoff tied directly to state law rather than company preference. Explain that relying on Symbol 6 across a multi-state fleet creates inconsistent protection, and that inconsistency becomes a balance-sheet risk when an uninsured driver causes a serious injury claim in a non-mandatory state. Recommend reviewing whether Symbol 2 or a state-specific buyback endorsement better matches the fleet's risk tolerance.
Frequently Asked Questions About Symbol 6
Does Symbol 6 cover rented or leased vehicles?
No. Symbol 6 applies only to owned autos, meaning vehicles titled to the named insured. Rented or leased vehicles require a different symbol, such as Symbol 8 for hired autos, to trigger any uninsured motorist coverage.
Can an agency add UM coverage back for a non-mandatory state under Symbol 6?
Yes, in many cases a carrier can endorse the policy to add uninsured motorists coverage for a specific vehicle or state even if that state does not legally require it. This typically requires a specific request and an additional premium, since Symbol 6 alone will not provide that coverage automatically.
Why would a carrier use Symbol 6 instead of Symbol 2?
Carriers sometimes default to Symbol 6 to match pricing and underwriting appetite to each state's actual legal requirement rather than applying broader coverage everywhere. This can result in a lower premium, but it shifts risk to the insured in any state without a compulsory UM mandate.
How does an agency find out which states have compulsory UM laws?
State insurance department websites and NAIC compiled summaries list compulsory uninsured motorist requirements by state. Agencies working multi-state fleets should verify this list periodically, since state legislatures do amend UM requirements over time.
What happens if a vehicle's garaging state changes mid-term?
Coverage under Symbol 6 follows the vehicle's garaging state at the time of loss, so a mid-term move from a non-mandatory state to a mandatory state can change whether UM coverage applies. Agencies should update the symbol schedule and garaging state immediately whenever a vehicle relocates.
Is Symbol 6 ever the right choice for a fleet account?
Symbol 6 can be appropriate for a fleet that operates entirely within a single state with a compulsory UM law, where the narrower trigger does not create any practical gap. It becomes risky mainly when a fleet spans multiple states with differing UM requirements.
Sources and References
- IRMI. Uninsured Motorists Coverage.