Margin Clause Guide

A margin clause limits how much a blanket property policy will pay for one building or one category of contents. The limit is calculated by multiplying the value reported for that property on the statement of values by a percentage stated in the policy.

For example, if a building is reported at $1.5 million and the margin percentage is 120%, the calculated maximum for that building is $1.8 million. A larger blanket limit may still cover several buildings, but it does not override this building-specific maximum.

This matters when reported values fall behind current replacement costs. It also matters when coinsurance, agreed value, deductibles, and other limits apply to the same loss. Each provision performs a different job, and the final payment must satisfy all of them.

This guide focuses on ISO CP 12 32 06 07. Proprietary clauses may use different terms, percentages, property groupings, or calculations, so the attached policy language controls.

What CP 12 32 does

ISO CP 12 32 is titled Limitation on Loss Settlement — Blanket Insurance (Margin Clause). It applies only to property covered under a blanket limit. The endorsement defines a blanket limit as one limit that applies to two or more buildings, building and contents, contents in more than one building, or contents at more than one premises.

For covered property listed in the endorsement schedule, CP 12 32 determines a maximum for each building and separately for the contents of each building or premises. The basic calculation is:

Reported property value × margin percentage = maximum loss payable for that property

The calculation uses the value shown in the “latest statement of values reported to us.” If the statement does not identify each building and contents value separately, the endorsement says the insurer will determine the individual values as part of the total reported values before applying the percentage.

The standard endorsement can be used with:

• Building and Personal Property Coverage Form (CP 00 10);
• Condominium Association Coverage Form (CP 00 17);
• Condominium Commercial Unit-Owners Coverage Form (CP 00 18); and
• Standard Property Policy (CP 00 99).

ISO rating materials provide factors for 105%, 110%, 120%, and 130% margin percentages. The schedule controls the percentage for the property at issue. A proprietary form may use another percentage.

The margin clause does not increase the blanket limit. Actual payment remains subject to the rest of the policy, including the blanket limit, coinsurance when applicable, the deductible, valuation conditions, and any other relevant limits or exclusions.

How the calculation works

Assume a fire destroys one building in a four-building portfolio:

• blanket building limit: $8,000,000;
• Building 2 value on the statement of values: $1,500,000;
• margin percentage for Building 2: 120%;
• actual replacement cost of Building 2 at the time of loss: $2,400,000;
• combined value reported for all four buildings: $6,500,000;
• combined actual replacement cost of all four buildings: $9,600,000;
• coinsurance requirement: 90%;
• agreed value: not active; and
• deductible: $10,000.

Step 1: Calculate the margin maximum

$1,500,000 × 120% = $1,800,000

That is the most CP 12 32 allows for Building 2, subject to the blanket limit and the rest of the policy.

Step 2: Calculate coinsurance

The amount required to satisfy 90% coinsurance is:

$9,600,000 × 90% = $8,640,000

The coinsurance ratio is:

$8,000,000 ÷ $8,640,000 = 0.9259

Applied to the $2,400,000 loss:

$2,400,000 × 0.9259 = $2,222,222 (rounded)

Step 3: Apply the deductible

$2,222,222 − $10,000 = $2,212,222

Step 4: Compare the result with the margin maximum

The $2,212,222 result is greater than the $1,800,000 margin maximum, so the calculated payment is limited to $1,800,000. The difference between the $2.4 million replacement cost and that payment is $600,000, assuming no other coverage changes the result.

Without the margin clause, the coinsurance-and-deductible calculation in this example would produce approximately $2,212,222—not the $1.8 million maximum.

How coinsurance and agreed value interact

A margin clause and coinsurance are separate restrictions. Coinsurance compares the amount of insurance carried with the amount required by the policy. A margin clause compares the building or contents loss with a percentage of its reported value. Either one may control the result.

If agreed value is active and its conditions are met, it suspends coinsurance for the applicable period. It does not remove CP 12 32’s margin maximum.

Using the first example, without a coinsurance penalty the $2.4 million loss would be reduced by the $10,000 deductible to $2.39 million. The margin maximum would still limit the calculated payment to $1.8 million.

A second example: coinsurance controls

Assume instead:

• three-building blanket limit: $6,000,000;
• reported value: $2,000,000 per building;
• combined actual replacement cost: $9,000,000;
• Building 1 actual loss: $3,000,000;
• margin percentage: 120%;
• coinsurance requirement: 90%; and
• deductible: $10,000.

The margin maximum is:

$2,000,000 × 120% = $2,400,000

The coinsurance calculation is:

$6,000,000 ÷ ($9,000,000 × 90%) = 0.7407

$3,000,000 × 0.7407 = $2,222,222 (rounded)

$2,222,222 − $10,000 = $2,212,222

Because $2,212,222 is below the $2.4 million margin maximum, coinsurance and the deductible—not the margin clause—determine the calculated payment. The difference from the $3 million loss is approximately $787,778.

If the blanket limit instead satisfied the $8.1 million coinsurance requirement, the loss after the deductible would be $2.99 million. The margin clause would then cap the result at $2.4 million. Correcting one insurance-to-value problem can therefore expose the other limit.

Where to find the clause

On an ISO policy, CP 12 32 appears as a separate endorsement with its own schedule. The declarations or forms list should identify it, but the complete endorsement is needed to determine which premises, building, property, and percentage apply.

Proprietary policies may place similar language in:

• the Limits of Insurance section;
• the loss-settlement or valuation conditions;
• a supplemental declaration;
• a statement-of-values endorsement; or
• an occurrence-limit endorsement.

The wording may not use “margin clause.” Search for provisions that connect a maximum payment to a percentage of the latest reported building or contents values.

If the quote, binder, proposal, and issued policy do not match, record the difference and determine which document governs. Do not assume an underwriting note or proposal changes the issued policy unless it was incorporated or governing law provides another remedy.

How the statement of values affects the result

The statement of values supplies the number to which the margin percentage is applied. It is different from the blanket limit, even though the total reported values may have been used to develop that limit.

Three questions are especially important:

1. Which statement is the latest one reported to the insurer? Identify the version, transmission date, recipient, and any acknowledgment or policy change.
2. Are building and contents values listed separately? If not, CP 12 32 allows the insurer to determine individual values from the reported total.
3. Does the statement use the valuation basis required by the policy? Replacement cost, actual cash value, stock, and business-income values should not be treated as interchangeable.

A replacement-cost appraisal does not automatically replace the statement of values named in the clause. It may help explain or challenge the record if it was supplied before the loss, but the policy’s reference to the latest statement reported to the insurer remains central.

Seasonal inventory and recent renovations deserve separate attention. If the reported contents or building value does not reflect the property present when the loss occurs, the margin maximum may be lower than the covered loss. Peak-season, value-reporting, newly acquired property, or other provisions may affect the analysis and should be reviewed independently.

Margin clauses and occurrence limits

Terminology varies, especially in proprietary policies. In general:

• a margin clause permits a percentage above the reported value, such as 110% or 120%; and
• a per-location or occurrence limitation of liability provision may cap recovery at the reported value itself.

The two provisions can appear together. If they operate as independent caps, they do not add together: the lower one controls. A 100%-of-SOV occurrence limitation therefore remains lower than a separate 120% margin cap. Different wording may instead amend the limit provision itself so that the operative per-item ceiling is the stated percentage times reported value. The text and cross-references control.

Treat “100% margin clause,” “scheduled limit,” “per-location limit,” and “occurrence limit” as clues, not interchangeable legal definitions. Calculate each provision from its own wording.

Why insurers use margin clauses

Blanket insurance can make one combined limit available across multiple buildings or categories of property. That flexibility creates an insurance-to-value concern when individual locations are reported below their actual values, particularly when agreed value suspends coinsurance.

CP 12 32 links the amount available for one building or its contents back to the values supplied for that property. The percentage provides some room above the reported figure, but the clause still limits how much of the blanket limit can be used at that location.

The scale of valuation errors can be significant. Swiss Re reported that an April 2022 fire destroyed a Walmart distribution center in Plainfield, Indiana, with an estimated property claim of about $500 million, while carriers had underwritten the location at values ranging from $41 million to $79 million. The example illustrates insurance-to-value risk; it is not presented as a reported CP 12 32 claim.

An Independent Insurance Agents & Brokers of America article also cites a 1999 Marshall & Swift review of more than 900,000 properties, reporting that 70% were undervalued by an average of 30%. That older industry statistic should not be treated as a current prevalence study, but it helps explain the longstanding underwriting concern.

When reported values need closer review

The relevant issue is not the property label by itself. It is whether the reported value accurately reflects the property and valuation basis required by the policy. Closer review may be useful for:

• older, historic, or specialized buildings whose construction is difficult to model;
• churches, schools, industrial facilities, and other properties with custom assemblies or equipment;
• renovated buildings whose statements were not updated;
• contents that fluctuate seasonally;
• portfolios that add, remove, or reclassify locations during the policy term; and
• policies in which building, contents, stock, or business-income figures are combined or allocated unclearly.

These are examples, not a ranking of which accounts most often carry margin clauses. Current valuations and an itemized statement of values reduce uncertainty regardless of property type or market.

FAQ

Is the blanket limit still available when a margin clause applies?

The blanket limit remains the overall policy limit, but CP 12 32 adds a maximum for each scheduled building and separately for its contents. Payment cannot exceed either restriction.

Does a margin clause replace coinsurance?

No. Both may apply. Coinsurance may reduce the loss below the margin maximum, or the margin maximum may cap a loss that otherwise satisfies coinsurance.

Does agreed value remove the margin clause?

No. When active, agreed value suspends coinsurance under its terms. It does not remove CP 12 32 unless the policy expressly says so.

Which statement of values controls?

CP 12 32 refers to the latest statement of values reported to the insurer. Confirm the actual document, when and how it was delivered, and whether the insurer acknowledged or incorporated an update. Proprietary clauses may use different wording.

Does the percentage apply to the whole location?

Under CP 12 32, the insurer determines a maximum for each building and separately for the contents of each building or premises. The schedule and the statement of values determine the specific property and percentage. Proprietary wording may group property differently.

Can the clause be changed or removed?

It may be negotiable before inception or renewal, depending on the insurer and account. Updated valuations may support a different percentage or removal, but the underwriter is not required to agree. Changes should be reflected in the issued policy.

For Policyholder Representatives

At claim intake, obtain the issued policy and every statement of values exchanged before the loss. Build a dated record showing who sent each version, who received it, and whether an endorsement or revised declaration followed. A spreadsheet used internally but never reported to the insurer may not satisfy the clause.

Reproduce the insurer’s calculation rather than beginning with the assumption that the full blanket limit is available. Keep the margin maximum, coinsurance result, valuation basis, deductible, and blanket limit on separate lines. That makes it easier to identify a wrong percentage, property grouping, statement version, or arithmetic step.

If the policy is unclear about the scheduled property, allocation of unitemized values, or interaction among provisions, preserve the underwriting and transmission record and consult coverage counsel. A replacement-cost appraisal can establish the amount of loss or show that a pre-loss value was supplied, but it does not by itself rewrite the statement named in the policy.

Claim Intake Checklist for Policyholder Representatives

Margin clauses and Frontera

Frontera’s Coverage Analysis can help locate margin clauses and other reported-value limitations, connect them to relevant declarations and statement-of-values references, and link the findings to source policy pages. That gives the reviewer a faster way to assemble the calculation inputs.

Frontera’s Estimating tools can organize building and contents evidence and compare the documented amount of loss with the reported values and policy calculations. They do not decide which statement legally controls or whether a clause is enforceable. Those questions depend on the policy, transmission record, and governing law.

References

• ISO CP 12 32 06 07, Limitation on Loss Settlement — Blanket Insurance (Margin Clause)
• ISO CP 16 15, Statement of Values
• Independent Insurance Agents & Brokers of America, Margin Clauses and Blanket Insurance (originally published 2013)
• Independent Insurance Agents & Brokers of America, Margin Clauses
• Risk & Insurance Education Alliance, Commercial Property course material, section on CP 12 32
• Donald S. Malecki, Margin Clauses Making Agreed Value Options Extinct!, Adjusting Today (2009)
• Paul Martin and Cat Ferris, At the Margin: Blanket Insurance and the Impact of Margin Clause Endorsements, Rough Notes (January 2022)
• Mohit Pande, Closing the Gap on Insurance to Value, Swiss Re (April 25, 2023)
• IRMI, Margin Clause definition

This article is for educational purposes and does not constitute legal advice. Consult coverage counsel on specific claims and disputed policy interpretations.