Fundamentals, treaty structures and platform explained — 26 questions in 14 languages.
Try RI-TOOLReinsurance is insurance purchased by an insurance company from one or more reinsurers to limit its exposure to large claims. When a direct insurer underwrites a policy, it accepts financial risk on behalf of the policyholder. Reinsurance allows it to transfer part of that risk to a reinsurer in exchange for a share of the premium. When a covered loss occurs, the reinsurer pays its agreed share to the cedant, preserving solvency and continued underwriting capacity. Reinsurance operates under two broad models: treaty, which automatically covers a defined portfolio of risks, and facultative, which covers individual risks negotiated case by case.
In proportional reinsurance, the reinsurer shares premiums and losses with the cedant according to an agreed proportion. The two principal forms are quota share, where a fixed percentage of each risk is ceded, and surplus, where the cession varies with the sum insured relative to the cedant's retention. In non-proportional reinsurance, the reinsurer only intervenes when losses exceed a defined threshold called the retention or priority. The most common non-proportional structures are Excess of Loss (XL) and Stop-Loss.
Excess of Loss reinsurance is a non-proportional treaty under which the reinsurer indemnifies the cedant for the portion of a loss that exceeds a defined retention, up to a specified limit. For example, a layer of 20M xs 5M means the cedant retains the first 5 million and the reinsurer covers the next 20 million. XL can be structured per risk, per event, or per occurrence. It is the dominant protection mechanism against large individual losses and catastrophe accumulations.
Treaty reinsurance automatically covers an entire portfolio under a standing agreement. Once the treaty is in force, every eligible risk is ceded without individual negotiation. Facultative reinsurance applies to a single, individually identified risk that the cedant chooses to reinsure separately, typically because it falls outside the treaty scope or exceeds its limits. Facultative placement requires individual underwriting by the reinsurer for each risk.
The reinsurance market involves several key actors: cedants that transfer portions of their risk; reinsurers that assume those risks — Munich Re, Swiss Re, Hannover Re, Berkshire Hathaway Re, SCOR and Lloyd's syndicates; reinsurance brokers — Aon, Guy Carpenter, Gallagher Re — acting as intermediaries; actuaries who model expected losses and price treaties; and legal teams ensuring contract wording is precise and enforceable.
A profit commission is a contractual provision under which the reinsurer pays the cedant a share of the underwriting profit generated by the reinsured portfolio. It is calculated as an agreed percentage of net profit — premiums received less losses paid and expenses — subject to a deficit carry-forward that prevents the cedant from receiving commission in profitable years that follow unprofitable ones. Profit commissions align the interests of cedant and reinsurer and are common in proportional treaties.
Incurred But Not Reported (IBNR) reserves represent the estimated liability for losses that have already occurred but have not yet been reported to the insurer or reinsurer. They are a critical element of balance-sheet solvency because claims — especially in long-tail lines like liability and workers compensation — can take years or decades to emerge and settle. Reinsurers price and manage IBNR exposure using actuarial development patterns and industry benchmarks. Accurate IBNR estimation directly affects treaty pricing, commutation negotiations and regulatory capital requirements.
Catastrophe reinsurance is a form of excess-of-loss protection designed to absorb the aggregated impact of a single natural or man-made event on a portfolio — for example, a hurricane, earthquake, flood or terrorist attack. The cedant retains losses below the attachment point; the reinsurer covers the layer above it up to the limit. Cat covers are typically structured per occurrence and priced using probabilistic loss models (RMS, AIR, OASIS) that estimate return periods for events of different severities.
A reinsurance clause is a contractual provision that defines how risk, premiums, losses, and obligations are shared between the cedant and the reinsurer. Clauses form the building blocks of any reinsurance treaty or facultative agreement: they specify the scope of cover, the conditions under which the reinsurer pays, the limits and retentions that apply, and the procedural obligations of each party. The precise wording of each clause is legally binding and directly determines how the statement of account is calculated, how disputes are resolved, and how the contract behaves when an unusual loss event occurs.
Climate change is reshaping natural catastrophe reinsurance by increasing the frequency and severity of secondary perils — wildfires, flash floods, convective storms and coastal flooding — that historically received less modelling attention than primary perils. Reinsurers have responded with higher risk-adjusted pricing, tighter terms, reduced capacity for the most exposed zones and increased use of parametric triggers. Some lines are becoming difficult to reinsure at economically viable rates, creating coverage gaps that affect primary market availability.
A claims control clause sets out who controls the handling, defence, and settlement of claims, and whether the reinsurer must give consent before settlement. When present, it typically requires the cedant to notify the reinsurer promptly, to follow agreed claims procedures, and to obtain reinsurer approval before committing to a settlement above a defined threshold. Without a claims control clause, the cedant retains full discretion over claims management, which may expose the reinsurer to settlements it considers unreasonable. The clause directly affects the reinsurance recovery process and must be accurately modelled to avoid disputes over whether a given settlement is recoverable.
Cyber reinsurance covers losses arising from data breaches, ransomware, business interruption from IT failures and related digital risks. It is a rapidly evolving line characterised by high accumulation risk — a single systemic event such as a cloud outage or software vulnerability can affect thousands of insureds simultaneously. Reinsurers limit cyber exposure through event limits, systemic exclusions and aggregate caps. Pricing is data-intensive, relying on cedant portfolio composition, coverage triggers and third-party cyber scoring of insured entities.
A follow the fortunes clause requires the reinsurer to follow the cedant's good-faith underwriting and claims decisions, subject to the treaty wording. It means that if the cedant pays a claim under the original policy — even if the reinsurer might have decided differently — the reinsurer is generally bound to follow that decision and pay its share. The clause creates alignment between cedant and reinsurer on portfolio outcomes, but it does not protect the cedant from fraud, bad faith, or claims falling outside the treaty scope. Modelling this clause correctly in a DAG structure requires mapping the conditions under which the follow obligation is triggered and any carve-outs that limit it.
Terrorism risk is typically excluded from standard property catastrophe treaties and covered through dedicated terrorism pools or facilities, often with government backstop involvement. In many markets, state-sponsored pool structures — Pool Re in the UK, GAREAT in France, EXTREMUS in Germany, TRIA in the US — provide capacity after private market capacity is exhausted. Reinsurers active in terrorism lines model CBRN, conventional and cyber-physical attack scenarios, with significant uncertainty in tail estimates.
A follow the settlements clause obliges the reinsurer to follow reasonable settlement decisions made by the cedant, provided they fall within the scope of the reinsurance contract. Unlike follow the fortunes, which covers the entire underwriting relationship, follow the settlements is narrower and focused specifically on claims settlements. The cedant must demonstrate that the settlement was made in good faith, that the loss is prima facie within the policy, and that the amount is reasonable. This clause is common in proportional and facultative reinsurance. Misreading its scope — for instance confusing it with a broader follow the fortunes provision — leads to incorrect recovery expectations in the statement of account.
Longevity reinsurance transfers the risk that a population of annuitants or pensioners lives longer than assumed in the pricing basis. Cedants — typically life insurers and pension schemes — use it to hedge the mismatch between mortality improvement assumptions and actual survival rates. Structures include indemnity treaties based on actual payments, index-based covers using population mortality indices, and longevity swaps. Longevity is a long-duration risk with multi-decade tail, requiring sophisticated stochastic modelling and matching of inflation-linked liabilities.
An hours clause defines the time window during which a catastrophic event is considered to occur for the purpose of aggregating losses under a single occurrence. Typical windows range from 72 hours for windstorm to 168 hours for earthquake or flood. All losses falling within that window and arising from the same event can be combined to breach the treaty attachment point. The clause is critical in catastrophe excess-of-loss treaties: without it, individual losses might never reach the attachment point, even if the aggregate impact of the event is enormous. Modelling the hours clause incorrectly — for instance using a fixed calendar period instead of the treaty-defined window — directly distorts the recovery calculation in the statement of account.
Parametric reinsurance pays a pre-agreed amount when a defined physical index — wind speed, earthquake magnitude, rainfall level — reaches a specified trigger, regardless of actual loss incurred. This eliminates loss adjustment delays and basis risk from policy coverage gaps, making it attractive for sovereigns, agricultural programs and rapid-response financing. The primary risk is basis risk: the parametric payout may diverge from the cedant's actual loss if the index is not perfectly correlated with portfolio damage.
An aggregation clause explains when multiple individual losses can be combined into a single loss event for reinsurance purposes. It determines whether a series of losses — caused by related circumstances, the same originating event, or a common factor — are treated as one occurrence or as separate events. The definition of aggregation has a direct impact on whether the treaty attachment point is reached and how the reinsurance limit is consumed. Aggregation clauses are particularly significant in liability, cyber, and catastrophe covers, where systemic events can affect many policyholders simultaneously. A mismodelled aggregation clause can cause the statement of account to either overstate or understate recoveries by treating multi-event losses as single, or vice versa.
An aggregate excess of loss (Agg XL or Stop-Loss) cover provides protection when the cedant's cumulative losses over a defined period — typically one underwriting year — exceed an annual aggregate retention. Unlike per-occurrence XL, it is not triggered by a single event but by the accumulation of frequency losses that individually fall below the per-risk retention. Agg XL is used to protect combined ratios and stabilise earnings in volatile short-tail lines.
An event definition clause describes how a loss event is identified and bounded, especially for catastrophe, accident, or occurrence-based cover. It determines what constitutes a single event — for example, whether multiple storms in the same week are one event or several, or whether losses in different territories caused by the same weather system are aggregated. The definition interacts directly with the hours clause and the aggregation clause to determine the final loss figure presented to the reinsurer. Ambiguous event definitions are one of the most common sources of reinsurance disputes. In RI-TOOL, modelling the event definition as a DAG node with explicit conditions prevents the ambiguity from propagating into the statement of account.
A sliding scale commission is a proportional reinsurance provision in which the commission paid by the reinsurer to the cedant varies inversely with the loss ratio of the reinsured portfolio. A lower loss ratio generates a higher commission; a higher loss ratio reduces it, down to a minimum floor. The scale aligns incentives: the cedant is rewarded for good underwriting performance and the reinsurer is protected against adverse selection. It is commonly paired with a profit commission for comprehensive alignment.
A cut-through clause allows an original insured, or another named beneficiary, to claim directly against the reinsurer in certain circumstances — typically if the cedant becomes insolvent and cannot pay claims. Rather than the reinsurance recovery passing through the cedant's estate, the cut-through directs payment straight to the original policyholder. This clause is common in fronting arrangements and in markets where the financial strength of the cedant is uncertain. It creates a direct legal relationship between the reinsurer and the original insured that would not otherwise exist, and must be flagged clearly in the contract structure to ensure it is reflected accurately in cash-flow modelling and the statement of account.
A reinstatement clause in an excess-of-loss treaty restores the limit of coverage after it has been partially or fully exhausted by a paid loss. Reinstatements may be free — requiring no additional premium — or paid at a specified rate, often pro rata to the loss as a percentage of the limit. The number of reinstatements is fixed at inception; once all are used, the layer provides no further protection for the remainder of the treaty period.
An insolvency clause sets out what happens to the reinsurance contract if the cedant becomes insolvent. It typically provides that the reinsurer remains liable for its share of losses, that reinsurance recoveries are paid to the cedant's estate or liquidator rather than directly to policyholders, and that the contract continues in force for the run-off of existing liabilities. Without a properly drafted insolvency clause, there is a risk that the reinsurer could claim that its obligations are extinguished by the cedant's insolvency, or that payments flow to the wrong party. The clause is essential in long-tail portfolios and must be modelled carefully to reflect the correct payment hierarchy in the statement of account during a run-off scenario.
Loss development refers to the process by which the ultimate cost of a claim changes between its initial report and its final settlement. Losses develop upward as additional damages, legal costs or late-emerging injuries are reported. Actuaries use development patterns — triangles of paid and incurred losses by accident year and development age — to project ultimate losses. In long-tail lines, development can continue for twenty or more years. Underestimating development leads to reserve deficiencies that can threaten solvency and distort treaty pricing.
An arbitration clause requires disputes under the reinsurance contract to be resolved by arbitration rather than court proceedings. Reinsurance arbitrations are typically conducted by panels of industry experts rather than judges, which allows technical arguments about treaty interpretation, loss calculation, and market practice to be assessed by people with direct reinsurance experience. The clause usually specifies the seat of arbitration, the governing law, the number of arbitrators, and the selection process. Arbitration is generally confidential and faster than litigation. From a modelling perspective, arbitration clauses reinforce the importance of precise clause drafting in RI-TOOL: ambiguous wording that reaches arbitration will be interpreted against the drafter if the meaning is unclear.
A notice clause requires the cedant to notify the reinsurer of claims, losses, or events within a specified time frame. Late or absent notification can jeopardise the cedant's right to recover under the reinsurance contract. Notice obligations vary: some clauses require notification as soon as a loss is reported, others only when it reaches a threshold amount, and others at each stage of development. In long-tail lines, notice clauses interact with IBNR reserving and can affect when the reinsurer is brought into the claims handling process. Modelling the notice clause precisely — including the trigger, the threshold, and the consequence of non-compliance — is essential to avoid recovering less than expected or triggering prejudice defences by the reinsurer.
A claims cooperation clause requires the cedant to consult with or keep the reinsurer informed about claims handling, often in major or complex losses. Unlike a claims control clause — which gives the reinsurer decision-making power — a cooperation clause creates an obligation to share information and involve the reinsurer in the process, without necessarily giving it veto rights. It may require the cedant to provide claims files, attend joint meetings, or follow agreed reserving guidelines. Breach of a cooperation clause can give the reinsurer grounds to reduce or deny recovery. In RI-TOOL, cooperation obligations can be modelled as conditional nodes in the claims section of the treaty DAG, linked to the recovery calculation to reflect their impact on the statement of account.
RI-TOOL is a SaaS platform designed for reinsurance teams who need to formalise, structure and share complex reinsurance clause documentation. It serves actuaries, underwriters, reinsurance managers, SOA specialists and risk modellers working on treaty design, clause libraries and statement-of-account templates. Rather than replacing pricing or modelling engines, RI-TOOL focuses on the formalisation layer: turning clause intent into structured, auditable DAG-based documentation that can be versioned, tagged and shared across a multi-tenant environment.
Every line of a reinsurance clause translates into a calculation rule in the statement of account. The attachment point, the limit, the aggregation definition, the reinstatement conditions, the profit commission scale — each of these is derived directly from the clause wording. When the wording is ambiguous or incorrectly interpreted, the calculation rules are wrong, and the statement of account produces figures that do not reflect the actual contractual obligations. Common consequences include recoveries that are understated because an aggregation clause was read too narrowly, overstated because an hours clause was ignored, or disputed because a follow the settlements obligation was misclassified. RI-TOOL addresses this by requiring each clause to be formalised as a DAG — a structured graph of conditions and dependencies — before it can be linked to the statement of account template. This makes every assumption explicit and auditable.
A Directed Acyclic Graph (DAG) in RI-TOOL is a structured representation of a reinsurance clause, where nodes represent logical elements — conditions, thresholds, formulas, references — and directed edges represent dependencies or calculation flows between them. DAGs enforce consistency: the acyclicity constraint prevents circular definitions. Each clause in RI-TOOL is backed by one or more DAGs, enabling actuaries to model complex multi-layer structures, profit commissions, sliding scales and reinstatement logic in a formally verifiable form.
A mismodelled reinsurance clause introduces errors that compound across the entire statement of account. The most common consequences are: recoveries paid or requested at the wrong amount because an attachment point or limit was misread; incorrect premium or commission flows because a sliding scale or profit commission mechanism was simplified or omitted; disputes with the reinsurer because the cedant's calculation does not match the reinsurer's reading of the same clause; and regulatory capital miscalculations because the risk transfer was assessed on incorrect parameters. In long-tail lines, a modelling error made at contract inception may not surface until years later, when the loss development reveals the discrepancy. RI-TOOL prevents this by making the clause logic explicit in a DAG at the time of formalisation, so that errors in interpretation are caught before they propagate into the financial statements.
RI-TOOL organises work across eight complementary profiles: Junior Underwriter (drafts clauses, manages dependencies and RI term tags), Senior Underwriter (validates clauses, manages the glossary and reference data), Actuary (formalises clauses as DAGs, attaches dimensions and risk connections), Risk Modeller (builds exposure graphs with site, peril and coverage nodes), Manager (instantiates graphs on real contracts and enters dimension values), SOA Senior (designs statement-of-account templates as DAGs), SOA Junior (instantiates SOA templates and produces financial statements), and Tenant Admin (manages tenant-level reference data).
RI-TOOL formalises reinsurance clause logic as Directed Acyclic Graphs — DAGs — in which each node represents a condition, a threshold, a formula, or a reference value, and each edge represents a dependency or a calculation flow. This means that the structure of a clause — its conditions, its limits, its triggers, and its interactions with other clauses — is made explicit rather than left implicit in a spreadsheet or a narrative summary. Actuaries use the DAG to document the exact logic of each clause: for example, the reinstatement calculation depends on the loss as a percentage of the limit, which itself depends on the occurrence definition, which references the hours clause. Once the DAG is validated, it is connected to the statement of account template so that the financial output is always derived from the formalised clause logic, not from a manual interpretation that may differ between users or over time.
RI-TOOL supports 14 languages across all public-facing content and the RI Terms glossary: English, French, German, Spanish, Italian, Portuguese, Dutch, Polish, Japanese, Arabic, Korean, Chinese, Turkish and Hebrew. Arabic and Hebrew are rendered right-to-left. The RI Terms glossary stores each concept once per language with a shared id_term identifier, ensuring tag storage is always language-neutral (EN id_term) while display adapts to the user's chosen language. Guide pages, FAQs and glossary pages are generated statically in all 14 languages for SEO performance.
In RI-TOOL, the link between clause structure and the statement of account is direct and explicit. The actuary formalises each reinsurance clause as a DAG — capturing conditions, limits, reinstatements, commission scales, and aggregation rules. The risk modeller documents the exposure structure. The manager instantiates the DAG on a real contract and enters the values. The SOA Senior then designs the statement of account template as a separate DAG, where each formula node must be connected to a corresponding node in the manager's contract graph. This means that the statement of account is not a standalone spreadsheet — it is a structured output whose every line is traceable back to a specific clause node. When a clause changes, the impact on the statement of account is immediately visible. When a clause is ambiguous, the DAG structure forces the ambiguity to be resolved before the financial output can be produced, preventing errors from reaching the accounts.
A tenant in RI-TOOL is an isolated workspace for a single organisation — a reinsurance company, an insurance group or a consulting team. Each tenant has its own clause library, graph definitions, contracts, users and reference data. Tenants share the same underlying database but are strictly isolated by id_tenant filtering throughout the application. The platform follows a one-tenant-per-mandate model: the same organisation can create multiple tenants for different mandates, business lines or confidentiality perimeters.
Access to RI-TOOL is by request. On the login page, click the Request Access tab and submit your name, email, organisation and a brief description of your use case. The RI-TOOL team reviews each request and, if approved, provisions a tenant with pre-loaded reference data, glossary terms and example clause structures. You receive login credentials for all eight user profiles by email. Trial access is open-ended with no payment required upfront.
Documents uploaded in RI-TOOL — policy wordings, treaty texts, technical notes — are encrypted at rest using AES-256-GCM with a per-tenant key stored outside the web root. Tenant isolation is enforced at the database query level on every read and write operation. Authentication uses bcrypt-hashed passwords with session tokens. Access to the platform administration interface is restricted by IP allowlist. RI-TOOL does not use uploaded documents for model training or share data across tenants.
The RI Terms glossary is an integrated, multilingual reference of 298 reinsurance terms covering proportional and non-proportional structures, catastrophe modelling, actuarial reserving, contract mechanics and regulatory concepts. Each term includes a precise definition in all 14 supported languages. Within the platform, actuaries and underwriters use the glossary to tag clauses with standardised terminology, ensuring consistent vocabulary across the clause library. The glossary is also published as a public SEO resource at /[lang]/ri-glossary/ for the wider reinsurance community.