AM Best resets CRT capital charges; reinsurers await detail

AM Best published revised net capital charge tables for Fannie Mae and Freddie Mac’s credit risk transfer reinsurance programs on Aug. 21 in a Best’s Special Report, updating the charges attached to the ACIS and CIRT structures the two agencies use to move mortgage credit risk to reinsurers. The accompanying announcement says nothing about whether the new charges are higher or lower than the old ones, or which assumptions drove the recalibration. For insurers that write this business, that omission is a pricing event all by itself.

Net capital charges determine the capital AM Best’s framework expects a reinsurer to hold against assumed mortgage credit risk, so changing the tables changes the cost of that risk even when no transaction has changed hands. Because the tables are built around a representative sample rather than a transaction-by-transaction schedule, the revision works as a benchmark: it ripples through every transaction that resembles the sample, and a reinsurer cannot reprice one contract without re-running the whole portfolio against the new schedule.

No direction, no magnitude, no mortgage-performance assumptions appear in the announcement, so reinsurers must wait for the full special report to learn whether the tables tighten or loosen capital requirements. The missing detail, in a notice that otherwise reads as routine, suggests AM Best is treating the revision as a technical matter rather than a market event. For the insurers whose pricing rests on the tables, the effect will land with the numbers.

The revision travels on AM Best's rating framework, separate from a formal rule change or a market event, which means the cost of mortgage credit risk can move on the rating agency's model-review schedule as readily as on the collateral. Insurers writing CRT need to watch the publication calendar as closely as they watch the loans behind the securities.

CRT capital cost is set by a rating agency's model, not by the bond market's bid-ask spread, and the new tables are a prompt to re-run internal capital models and compare their charges against AM Best's. The gap between those two measures is where a competitive advantage — or a mispriced book — shows up. The next place that gap can move is the full special report.