Definition
Modified coinsurance is a reinsurance structure in which the reinsurer assumes a defined share of the policies in a block — premium, claims, and reserves — but the assets supporting the ceded reserves remain on the ceding carrier's balance sheet, with the investment income on those assets paid through to the reinsurer under the treaty.
Why it matters
For a contract owner, modified coinsurance produces an outcome that resembles coinsurance from a risk-transfer perspective but leaves the assets supporting the contract on the original carrier's books. The structure exists because asset retention has tax, regulatory capital, and accounting implications distinct from outright asset transfer. Naming modified coinsurance is part of seeing how full risk transfer can coexist with continued asset custody.
How it works
In a modified coinsurance arrangement — often called "modco" in industry usage — the ceding carrier transfers a defined share of premium, claims, and reserves to the reinsurer, but the assets supporting those reserves stay on the ceding carrier's balance sheet. The reinsurer's economic position on those assets is established through an accounting mechanism: the ceding carrier holds the assets, earns the investment income, and pays that investment income through to the reinsurer as part of the periodic reinsurance settlement. The reinsurer remains liable to the ceding carrier for claims on the ceded share of the block. From the contract owner's perspective, the original carrier continues to hold the supporting assets in its general account; from the reinsurer's perspective, the economic exposure to those assets is captured through the income-passthrough mechanism rather than through direct asset ownership.
In practice
Modified coinsurance appears in carrier statutory filings as a distinct category of reinsurance, separate from coinsurance and from funds-withheld arrangements. For an individual evaluating a commercial annuity, the practical significance is that the carrier's reported general-account assets may include assets effectively encumbered by modco settlements — economically associated with reinsurance but custodially still on the carrier's books. Financial strength rating commentary on carriers with material modco programs treats the structure as risk-transferred-but-asset-retained, with implications for capital adequacy and asset-liability management that differ from either pure coinsurance or no reinsurance at all. For a plan fiduciary, the modco footprint is a factor in characterizing the carrier's general-account composition relative to its risk-transferred liabilities.
In the Longevity Standard Framework
Modified coinsurance is supporting vocabulary in the Longevity Standard framework. It describes a structural arrangement in which the asset-backed claim's economic backing has been partially repositioned to a reinsurer through risk transfer, while the assets themselves remain in the ceding carrier's general account and continue to appear in its asset disclosures. The embedded spread economics of the underlying contracts are accordingly governed by an interaction between the ceding carrier's asset-management practices and the reinsurer's contractual claim on the investment income — a more complex configuration than either pure coinsurance or no reinsurance.
Related terms
- Reinsurance
- Coinsurance
- Funds withheld reinsurance
- Asset-backed claim
- General account
- Embedded spread
- Statutory accounting principles
- Investment yield