Straight answer: underinsurance is when the insured amount on the policy is lower than the real value of the asset. If a loss occurs, the insurer applies the so-called “proportional rule” and pays less than the damage — even when the loss is only partial. It is the most common and most expensive mistake in property insurance: the company believes it is covered and only discovers the gap when the payout arrives. If you run operations, a warehouse or a facility in Brazil, this is worth understanding before you sign.
How underinsurance happens
It is almost never bad faith. Usually it is a value that fell out of date:
- The amount did not keep up with reality: the building, machinery and installations were insured at an old value that never followed inflation, replacement cost or the company’s expansion.
- Stock was underestimated: insuring goods at a fixed amount overlooks the fact that stock varies through the year — at peak dates, the real volume sits well above the insured amount.
In both cases the policy looks fine on paper. The problem only surfaces at claim time.
The mechanics of the proportional rule
The logic is simple and worth grasping before you buy. Imagine an asset is worth X and you insured it for half of X. If a partial loss occurs, the insurer does not pay the full damage: it indemnifies in the same proportion as the coverage — that is, roughly half the loss. The rest is on you.
Note that this applies even to a partial loss. Many people think the proportional rule only affects total losses, but that is not the case: any indemnity is reduced in the same proportion by which the asset was underinsured. The exact calculation varies depending on the insurer and appears in the policy conditions.
How to avoid underinsurance
- Insure for the replacement value, not the depreciated book value. What matters is what it costs to replace the asset today, not what it is worth on the balance sheet.
- Review the insured amount at renewal — each year the replacement value shifts, and the policy needs to keep pace.
- Use clauses suited to your risk, such as an adjustment margin or an average-stock basis, when the volume of goods fluctuates through the year.
- Keep an updated appraisal or inventory, which gives a technical basis for sizing each coverage correctly.
And the opposite: over-insurance
Insuring for a value far above the real one does not help either. With over-insurance, you pay more premium without receiving a proportionally larger indemnity, because property insurance covers the actual loss, not the policy amount. The sweet spot is not “the more, the better” — it is sizing the insured amount as close as possible to the real replacement value.
A note on the local market
Property insurance in Brazil is regulated by SUSEP, the federal insurance authority, and policies are contracted through a company’s CNPJ (the Brazilian company tax ID). Terms, clauses and the exact proportional calculation vary depending on the insurer, so the wording matters as much as the number.
The broker’s role
Sizing the insured amount is not guesswork — it is the most technical part of property insurance. World Quality assesses the replacement value of your assets, selects the right clauses for your risk profile, and reviews everything at renewal so the policy keeps pace with the company. We calculate the correct insured amount with you — before a loss does that math for you.
Talk to us on WhatsApp: +55 11 95874-6067 — or learn more about insurance for foreign companies on our English home page.