Reinsurance Management: Treaties, Cessions, and Recoveries
Reinsurance is how insurers manage volatility and capital at scale. The administration behind it is still, for most insurers, a spreadsheet.
Reinsurance exists to transfer risk the insurer doesn't want to hold entirely on its own balance sheet — whether that's smoothing volatility on a large book, protecting against a single catastrophic event, or freeing up capital to write more business. It's central to how insurers manage both solvency and growth. The mechanics of it, though, are administratively heavy: knowing which treaty covers which policy, which claims have been ceded, and what's actually owed back from reinsurers at any given moment is a data problem as much as an underwriting one.
Treaty types, in plain terms
Reinsurance treaties fall into two broad families:
- Proportional treaties — the reinsurer takes a defined share of every risk within the treaty's scope, and receives the same share of premium in return. Under a quota share, that share is a fixed percentage across the whole book. Under surplus, the ceding share varies by risk, typically increasing for larger risks above the insurer's own retention line.
- Non-proportional treaties — the reinsurer only pays once losses cross a threshold. Excess of loss covers losses above a retention on a per-risk or per-event basis. Catastrophe excess of loss (Cat XL) covers the aggregate impact of a single catastrophic event across many policies at once — the layer that protects the balance sheet against a single large event rather than the accumulation of ordinary claims.
Most insurers run a program that combines both — proportional treaties to manage the everyday spread of risk and capital, non-proportional layers sitting above them to cap the tail.
Cessions: where the mapping actually matters
A cession is the act of transferring a specific risk — a policy, or a claim — into a treaty. This sounds mechanical, but it's where a surprising amount of reinsurance value quietly leaks. If a policy that should have been ceded under a treaty isn't correctly mapped, the insurer is carrying gross risk it believed was reinsured, and won't discover the gap until a claim comes in and there's no recovery to make. If a claim is ceded to the wrong treaty layer, or the cession percentage is wrong, the recoverable calculated against it will be wrong too.
Bordereaux — the periodic reports insurers send reinsurers listing ceded premiums and claims — are the traditional mechanism for keeping this reconciled, and they're still very often built manually, which is exactly where mapping errors accumulate and go unnoticed until an audit or a large claim forces a reconciliation.
A cession error doesn't announce itself. A policy incorrectly excluded from a treaty looks identical to a correctly retained policy — right up until it produces a claim the insurer assumed was covered.
Recoveries: tracking what's actually owed
A recoverable is the amount due back from a reinsurer against a ceded claim. Tracking recoverables well means knowing, at any point, what's been billed, what's been paid, what's aged past normal settlement terms, and which counterparty it sits with. This matters for three separate reasons:
- Cash flow — slow-moving recoverables tie up capital the insurer is entitled to but hasn't yet collected.
- Credit risk — a recoverable is only as good as the reinsurer's ability to pay it, which is why counterparty credit quality is tracked separately and why concentration with a single reinsurer is a real risk to monitor.
- Solvency capital — under SAM's standard formula, the credit an insurer receives in its counterparty default risk module for ceded risk depends on the recoverable being both collectible and correctly reflected. An overstated or poorly aged recoverables ledger overstates capital adequacy on paper, in a way that won't hold up under scrutiny.
Where manual reinsurance administration breaks down
- Treaty registers kept as static documents. Treaty terms, retentions, and layers recorded in a document rather than a structured, queryable format make it slow to answer a simple question: which treaty actually applies to this claim, right now.
- Bordereaux built by hand each cycle. Manually assembling ceded premium and claims data from source systems for every treaty, every period, is exactly the kind of repetitive, error-prone process that produces the mapping mistakes described above.
- Recoverables chased reactively. Without a system automatically flagging recoverables aging past terms, chasing reinsurers for payment becomes something that happens when someone notices, not on a schedule.
- No link back to claims and reserving. When reinsurance data lives apart from claims and reserving systems, net reserve figures — the ones that actually matter for the balance sheet — require a manual reconciliation step every time they're needed.
What good reinsurance administration looks like
The goal is a treaty register that's structured enough to automatically determine which treaty and layer applies to a given policy or claim, cessions that are calculated automatically rather than mapped by hand, and a recoverables ledger that's always current and tied directly to claims data — so net reserves, capital credit, and cash collection are all working from the same, up-to-date numbers rather than three separately reconciled spreadsheets.