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How a Common Loss Deductible Works
Normally, your auto and home insurance policies each carry their own deductible — the amount you pay out of pocket before your insurer covers the rest. If a hailstorm damages your roof and your parked car in the same storm, you'd typically owe both your homeowners deductible and your auto comprehensive deductible, even though it was a single event.
A common loss deductible changes that completely. When both your home and vehicle suffer damage from the same covered incident, you pay only one deductible — usually the higher of the two — instead of both. The insurer covers the rest across both claims, and you keep more money in your pocket when you need it most.
Separate Deductibles vs. Common Loss Deductible: Dollar-for-Dollar Comparison
| Scenario | Home Deductible | Auto Deductible | Without Common Loss | With Common Loss | You Save |
|---|---|---|---|---|---|
| Moderate deductibles | $1,500 | $500 | $2,000 | $1,500 | $500 |
| Higher deductibles | $2,000 | $1,000 | $3,000 | $2,000 | $1,000 |
| Lower deductibles | $1,000 | $500 | $1,500 | $1,000 | $500 |
As the table shows, savings range from $500 to $1,000 or more in a single qualifying storm event — a meaningful amount when you're already dealing with the stress of major property damage.
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Common Scenarios Where It Applies
The common loss deductible is specifically designed for situations where a single natural or accidental event damages both your home and your vehicle simultaneously. Understanding hail damage and how car insurance covers it is key to knowing when this feature applies. The most frequent qualifying events include:
- Hailstorm — The most common trigger. Hail dents your car's roof and panels while also damaging your home's roof, siding, and windows — all in the same storm. This is also the most common type of car insurance comprehensive claim filed in the U.S.
- Tornado or Windstorm — High winds collapse a fence onto your car while tearing shingles off your roof in the same event.
- Tree Falling — A large tree strikes both your vehicle in the driveway and your house's garage or roof at the same time.
- Garage Fire — A fire breaks out in your attached garage, damaging both the structure and the vehicle parked inside.
- Hurricane — Wind-driven debris damages your home's exterior and your parked vehicles in the same storm. Learn more about car insurance and hurricane coverage to understand when your auto policy responds.
Events That Typically Do NOT Qualify
| Situation | Reason Not Covered |
|---|---|
| A car accident + a kitchen fire weeks apart | Two separate, unrelated events |
| Flood damage to car + flood excluded on home policy | One loss is not covered under both policies |
| Pre-existing home damage + new storm car damage | Damage must originate from the same cause |
| One policy lapsed at time of loss | Both policies must be active and in force |
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Which Insurers Offer a Common Loss Deductible?
Not every insurer provides this feature. It's a specialty benefit that typically requires you to have both your home and auto policies bundled with the same carrier. Here are the most well-known providers:
Auto-Owners Insurance is one of the most recognized carriers for this feature. When the same event damages both your home and car, they reduce the auto deductible by the amount of your homeowners deductible — effectively eliminating the smaller of the two.
Acuity Insurance offers a similar benefit through its Road and Residence® Package Policy. Under this package, if the same event — like a hailstorm — damages both your home and vehicle, you pay a single per-event deductible rather than separate deductibles on each policy.
Other carriers may offer comparable provisions under different names: "single loss deductible," "combined deductible," or "single event deductible." Always ask your insurer directly what they call it and what's included. Bundling home and auto insurance can unlock not just common loss benefits but also significant premium discounts — sometimes 10–25% off your total insurance cost.
Requirements to Qualify & How to Add It to Your Policy
Qualification Requirements
The common loss deductible is not automatic — you must meet specific conditions before you can use it:
- Same insurer for both policies — Home and auto must be bundled with the same carrier. Policies split across two different companies will not qualify, even if both offer the feature individually.
- One event damages both — The same cause (hail, wind, fire, falling tree) must damage both your home and your vehicle in a single occurrence.
- Both policies must be active — Both must be in force and fully paid up on the date of the loss.
- Both claims must be filed — You typically need to file claims under both your homeowners policy and your auto policy for the same event to trigger the combined deductible.
- Coverage must apply on both sides — If one loss is excluded (e.g., flood on a standard homeowners policy), the combined deductible may not apply.
- Percentage-based deductibles may be excluded — In storm-prone areas, homes often carry a percentage-based wind/hail deductible (e.g., 2% of dwelling value = $7,000 on a $350,000 home). These may not be eligible for the combined deductible provision.
How to Add It to Your Policy
Adding a common loss deductible is straightforward once you know what to ask for. Before going through these steps, it also helps to understand how car insurance deductibles work so you can make informed decisions about your deductible levels on each policy.
- Confirm your home and auto are bundled with the same insurer. This is the most fundamental requirement — no bundle, no benefit.
- Review your current policy documents. Look in the endorsements section for terms like "common loss," "single loss deductible," "combined deductible," or "single event deductible."
- Call your agent or insurer. Ask directly: "Does my bundled policy include a common loss deductible endorsement, and if not, can I add it?"
- Request a quote for the endorsement. Some carriers include it at no additional cost as part of a bundled package; others may charge a small premium adjustment.
- Verify the claim procedure. Confirm whether you need to file both claims simultaneously or within a specific time window for the single deductible to apply.
- Get the updated declarations page. Once the endorsement is added, request confirmation in writing and keep it on file.
If you're also exploring other ways to lower your out-of-pocket exposure, look into vanishing deductible programs that reduce your deductible each year you drive safely — another smart way to shrink what you owe after a claim.
Frequently Asked Questions
What is a common loss deductible in car insurance?
A common loss deductible is a policy provision that allows you to pay only one deductible when a single event — such as a hailstorm, tornado, or fallen tree — damages both your car and your home at the same time. Instead of paying your auto deductible and your homeowners deductible separately, you typically pay only the higher of the two. It's available on bundled home and auto policies with select insurers like Auto-Owners and Acuity, and may be listed in your policy as a "single loss" or "combined deductible" endorsement.
Which insurance companies offer a common loss deductible?
Auto-Owners Insurance and Acuity Insurance are among the most recognized carriers offering this feature. Acuity provides it through its Road and Residence® Package Policy. Other carriers may offer similar provisions under different names, such as "single loss deductible" or "combined deductible." Availability varies by state, so you'll need to confirm directly with your insurer or agent whether the endorsement is available for your address.
How much can I save with a common loss deductible?
Savings depend on your specific deductibles. If your home deductible is $1,500 and your auto comprehensive deductible is $500, a common loss deductible saves you $500 per qualifying event. With higher deductibles — such as $2,000 home and $1,000 auto — you could save up to $1,000 in a single storm. The savings add up especially fast in hail-prone regions like Texas, Kansas, Nebraska, Oklahoma, and Colorado, where multi-property storm damage is common.
Do I need to bundle home and auto insurance to get a common loss deductible?
Yes, in nearly all cases. The common loss deductible requires both your home and auto policies to be with the same insurer and actively bundled together. If your policies are with separate carriers, you will not be eligible for this benefit, even if both insurers individually offer the feature. This is one of the most financially compelling reasons to keep your home and auto coverage under one roof.
Does a common loss deductible apply to flood or earthquake damage?
Generally, no. Standard homeowners policies exclude flood and earthquake damage, meaning those perils typically won't qualify for a combined deductible even if your car is also damaged by the same flood or quake. Additionally, percentage-based catastrophe deductibles — such as named-storm or hurricane deductibles common in coastal states — are frequently excluded from common loss deductible provisions. Always review your specific endorsement language or ask your agent to confirm which perils are included.