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Insurance excess: the amount does not tell you the whole rule
For French home insurance, Service Public describes the mechanisms below. Its excess explainer, verified on 21 October 2025, was consulted on 9 October 2026.
Absolute and relative excess: forms of deduction
| Mechanism | Principle described by Service Public |
|---|---|
| Absolute excess | An amount is deducted from compensation. |
| Relative excess | It acts as a claim threshold; above it, no excess is deducted. |
| Proportional excess | It is calculated as a percentage, potentially with lower or upper bounds. |
In Belgium, Wikifin also describes fixed excesses, percentage excesses and excesses expressed in a unit of measurement. This explanation belongs to Wikifin's Belgian educational material, updated on 23 January 2026, consulted on 9 October 2026.
These sources explain terminology within their respective scope. They do not establish a common rule for every French, Belgian, Luxembourgish and German policy.
For the calculations below, we use a fictional absolute excess of €200. We also set an eligible loss of €1,000 and a limit of €700. These amounts are assumptions created for this exercise; they do not come from any commercial offer.
In this exercise, knowing the amounts still leaves one question open: in what order do they apply?
Policy limits: two calculations with the same amounts
Both scenarios start with exactly the same data. We assume the entire €1,000 loss enters the calculation, with no other deduction, exclusion or payment from another party.
Only the order changes. Assumption A deducts the excess before applying the limit. Assumption B applies the limit before deducting the excess.
| Step | Assumption A: deduct, then cap | Assumption B: cap, then deduct |
|---|---|---|
| Fictional eligible loss | €1,000 | €1,000 |
| Fictional absolute excess | €200 | €200 |
| Fictional limit | €700 | €700 |
| First operation | €1,000 − €200 = €800 | Lower of €1,000 and €700 = €700 |
| Second operation | Lower of €800 and €700 = €700 | €700 − €200 = €500 |
| Calculated compensation | €700 | €500 |
| Out-of-pocket cost against the original loss | €1,000 − €700 = €300 | €1,000 − €500 = €500 |
Formula A is min(700, max(0, 1,000 − 200)). Formula B is max(0, min(700, 1,000) − 200). Taking the maximum of the result and zero prevents negative compensation in these formulas.
Result A leaves €300 to pay. The €200 excess is not added to that €300: the formula has already accounted for it. Adding it again would count the same deduction twice.
B gives a different result because we changed the order, not because the loss increased. The difference between the calculated compensation amounts is €200.
These assumptions do not describe any identified real policy. The table shows why a missing rule prevents us from selecting a certain result. It cannot rank two insurance policies or establish that a policy necessarily follows A or B.
With the same fictional inputs, changing the order moves the out-of-pocket cost from €300 to €500.
Policy date and version: which document does the figure belong to?
For home insurance in France, ABE Infoservice explains that the policy's particular conditions specify cover, excesses, limits and specific clauses. They also give the effective date, which may differ from the signing date. Source: ABE Infoservice's explanation of home insurance contracts, consulted on 9 October 2026.
Our fictional file now contains two documents saved under the same name. The first describes A; the second describes B. A separate note says only "excess: €200".
The note accurately reproduces an amount found in both documents. Yet it has lost the information needed to reproduce the calculation. Even with every euro entered correctly, the result remains undetermined.
A complete reference for the scenario would identify the document, its version, the date of the event being examined and the clause that sets the order of calculation. This makes the example verifiable: another person could use the same assumptions and arrive at the same result.
For someone working in Luxembourg who keeps documents from several countries, the scope of each reference also matters. A passage about French home insurance cannot, by itself, explain a Belgian or Luxembourgish document.
The filename does not settle that question. "Current policy" may be a label added when the file was saved; it does not establish which version corresponds to the event being examined.
In our fictional file, an accurately copied excess remains insufficient when the document version is unknown.
Estimated out-of-pocket cost: what missing data prevents us from concluding
The calculations above already assume an eligible loss. In the French home insurance process described by ABE Infoservice, the expert, when appointed, assesses the damage; the insurer examines cover and, where applicable, proposes compensation within the policy limits. Source: ABE Infoservice on what follows a claim notification, consulted on 9 October 2026.
Our exercise starts after those questions, using its own assumptions. A €1,000 invoice and a €1,000 eligible loss deliberately have the same value here. The table does not establish that equality for a real situation.
The exercise remains understandable as long as its unknowns stay visible:
- If the order is missing, A and B remain separate scenarios.
- If the eligible amount is missing, the starting amount is unknown.
- If the limit is missing, an empty cell does not mean "unlimited".
- If the payment date is missing, the table cannot place the incoming money on a timeline.
Replacing a missing input with zero would produce an apparently precise figure. It would also introduce a new assumption that could change the result substantially.
The same issue arises when a "covered" field has no answer. In our exercise, that absence confirms neither compensation nor a refusal. It simply means the example cannot yet represent that point.
An unknown input remains unknown; it does not become zero because a table expects a number.
Cash flow after a loss: the final cost and the money paid upfront
We return to assumption A: a €1,000 expense followed by assumed compensation of €700. We now add an entirely fictional timetable: the invoice is paid on day 10 and the money arrives on day 90.
These dates only illustrate the cash flow gap. They are neither legal deadlines nor an estimate of an insurer's processing time.
To isolate that gap, the exercise assumes no other money enters or leaves between those dates.
| Fictional point in time | Money movement | Cumulative cash flow effect |
|---|---|---|
| Before payment | No movement | €0 |
| Day 10: invoice paid | −€1,000 | −€1,000 |
| Between the two movements | No payment received | −€1,000 |
| Day 90: assumed compensation received | +€700 | −€300 |
The final cost is indeed €300. During the interval, however, cash has fallen by €1,000. Immediately subtracting the expected €700 would hide a period when that money has not yet arrived.
A second fictional calculation clarifies what "available" means. The household declares a total balance of €10,000, including €4,000 blocked and €3,000 reserved for other expenses. We assume those two categories do not overlap.
The declared amount freely available is therefore €10,000 − €4,000 − €3,000 = €3,000. After paying the full €1,000 loss, it falls to €2,000, before any compensation.
If the same money appeared among both blocked and reserved funds, this subtraction would remove it twice. The assumption of zero overlap avoids that double counting here.
The €3,000 is the result of the declarations used in the exercise. This calculation does not verify access to accounts or guarantee that the money can be used on the required date. It does not measure risk tolerance either: accepting uncertainty and having money available are separate questions.
In the fictional timetable, a final cost of €300 coexists with a temporary cash outflow of €1,000.
Frequently asked questions
Does a €200 excess mean I will pay only €200?
Not in our examples. With a fictional eligible loss of €1,000 and a €700 limit, assumption A leaves €300 to pay and assumption B leaves €500. The excess is identical; the calculation rule changes.
Is the excess deducted before or after the policy limit?
This guide deliberately sets out both assumptions. A deducts the excess before applying the limit; B applies the limit before deducting the excess. Without the information linking a real policy to a rule, automatically choosing either result would add an unconfirmed assumption.
How do you calculate an insurance out-of-pocket cost?
In this exercise, the out-of-pocket cost is the original loss minus the calculated compensation. For A, €1,000 minus €700 gives €300. That subtraction does not itself establish the eligible amount or compensation; it uses the assumptions already stated.
Why distinguish expected compensation from available cash?
In the fictional timetable, the invoice is paid on day 10 and compensation arrives on day 90. Cash therefore falls by €1,000 first, even though the exercise ends with a €300 reduction. Expected money and received money do not appear on the same date.
Key points
- In the fictional examples, a €200 excess does not determine the out-of-pocket cost on its own.
- Deducting before the limit produces €700 in compensation under A; deducting after the limit produces €500 under B.
- A missing rule prevents us from choosing between those two results.
- The fictional timetable distinguishes the €1,000 outflow from the final €300 cost.
- The declared amount freely available depends on blocked funds, reserved funds and any overlap between them.