Reserving
Reserving: 3 technical terms explained – definition, synonyms and legal basis.
IBNR (Incurred But Not Reported)
Synonyms: Late claims reserve
IBNR (incurred but not reported) refers to losses that have already occurred but have not yet been reported to the insurer; technical reserves are established for them.
Why IBNR is needed
Months to decades can pass between loss occurrence and notification – typically for bodily injury, product liability or occupational disease (long-tail business). Without IBNR reserves, the loss picture of an underwriting year would be systematically too optimistic.
Estimation methods
Actuarial methods such as chain-ladder or Bornhuetter-Ferguson project historical development patterns onto the current portfolio. Estimation uncertainty is greatest in immature underwriting years and when the portfolio changes.
Practical relevance
For companies with loss-sensitive programmes (for example retention funding through captives), IBNR estimates directly affect collateral requirements and accounting.
Payment-to-Reserve Ratio
Synonyms: Zahlungs-Reserve-Verhältnis
The payment-to-reserve ratio relates the payments already made for a line of business's accident-year losses to the reserves additionally established for those same losses.
Calculation
The payment-to-reserve ratio is calculated by dividing cumulative payments for an accident year’s losses by the reserves still held at that point (case reserves plus IBNR) for the same losses. It provides a quick indication of how far a loss year has developed.
Interpretation
A low ratio indicates an immature, largely undeveloped loss year – typical of long-tail lines such as liability, where losses are settled over many years. A rising ratio over time signals progressing development; an unexpectedly low ratio can point to under-reserving.
Practical relevance
In reinsurance, the payment-to-reserve ratio is frequently used for comparative analysis of cedents and underwriting years, for example during treaty negotiations or when assessing portfolio transactions. It complements classic development triangles with a compact snapshot.
Additional Interest Reserve (ZZR)
Synonyms: ZZR, Zinszusatzreserve
The additional interest reserve (ZZR) is the part of the technical provision in life insurance that is set aside on top of standard reserves for future guaranteed-interest obligations during periods of low capital market rates.
Background
Traditional life insurance contracts guarantee a minimum return on savings premiums for the entire contract term. When expected investment returns are no longer sufficient to fund this guaranteed-interest obligation, an additional interest reserve must be built up to proactively strengthen future risk-bearing capacity.
Calculation
The calculation compares each contract’s guaranteed rate against a reference rate, defined as the arithmetic mean of the yields on public bonds over a ten-year period, based on the euro-area yield curves published by the European Central Bank. If the reference rate is lower than the highest applicable guaranteed rate of a contract, an additional interest reserve must be established.
Practical relevance
The additional interest reserve has become significantly more important during the sustained low-interest-rate period and has absorbed a substantial share of German life insurers’ investment returns. It is therefore a key factor for the industry’s surplus participation and solvency.