How Percentage Deductibles Work

Maryland’s insurance regulator states the central rule directly: a percentage deductible is based on the Coverage A dwelling limit, not the amount of the damage claim.[1] Texas consumer guidance makes the same distinction between insured value and claim amount.[4]

dollar deductible = applicable insured limit × deductible percentage
simplified amount above deductible = max(covered loss − dollar deductible, $0)

Assume a $300,000 Coverage A limit and a hypothetical $20,000 covered loss. The table below uses the same deductibleAmount and deductibleImpact functions as the calculator.

The last column is not a claim-payment promise. It is only the hypothetical covered loss minus the deductible. Depreciation, limits, exclusions, prior payments, separate coverages, and replacement-cost conditions can change the amount and timing.

On a policy using Coverage A as the base, a 2% deductible remains $6,000 for that policy period even if one covered loss is $8,000 and another is $80,000. The loss amount changes the simplified amount above the deductible; it does not recalculate the deductible.

Coverage A is also not the home’s market price or purchase price. Use the declarations-page dwelling limit specified by the policy. If that limit rises at renewal, the dollar value of an unchanged percentage rises too.

Some forms may identify another base. North Carolina notes that a named-storm deductible may use Coverage A or Coverage C, depending on the policy form.[2] Condo and renters forms may not have the same Coverage A structure as a standard homeowners policy.

A wind/hail deductible may apply to covered damage from straight-line wind, hail, a tornado, or hurricane wind, depending on the endorsement. North Carolina DOI says its windstorm or hail percentage is based on Coverage A and shown on the declarations page.[2]

Do not assume the standard all-other-perils deductible applies simply because the storm was not named. Also verify which policy supplies wind coverage; some coastal properties use a separate wind policy with its own limit and deductible.

NAIC explains that many coastal policies have a separate hurricane or named-storm deductible, commonly expressed as a percentage of the home’s insured value. It also notes that definitions and triggers vary by state and insurer.[3]

A hurricane deductible is not automatically interchangeable with a named-storm or wind/hail deductible. The endorsement may refer to a National Hurricane Center watch, warning, named event, landfall, geographic area, or a defined time window. Some state systems apply a hurricane deductible once in a calendar year, while other deductibles may apply by occurrence. There is no single national trigger to substitute for the contract.

Flood and storm surge are separate causes. NAIC says flood damage requires separate flood insurance, generally through the NFIP or a private company; a wind deductible does not turn flood into a homeowners loss.[3]

1. Find the base: locate Coverage A or the other insured value named in the endorsement.
2. List every deductible: standard, wind/hail, hurricane, named storm, roof, and any separate-policy deductible.
3. Convert percentages: write the current dollar equivalent next to each percentage.
4. Read the trigger: match the cause, dates, and event definition to the applicable endorsement.
5. Check frequency: determine whether the deductible applies per claim, per occurrence, or on an annual basis.

Ask the insurer or agent to identify the exact form and current dollar amount in writing if the declarations page is unclear. The deductible is usually the policyholder’s portion of the covered loss, not a separate fee paid to the insurer.