Basel IA
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Basel IA is essentially an intermediate between the current Basel I accord and the proposed Basel II accord that is yet to be implemented. Basel IA would be more risk sensitive than Basel I but would not be as complex as the advanced approach under Basel II.
This is a concept that is being promoted by the US. The US initially proposed that banks would need to use the advanced approach only if they were to implement Basel II. The idea of Basel IA is to enable smaller US banks to adopt a methodology that is more risk sensitive than Basel I that they are currently using for calculating capital adequacy. The Fed chairman mentioned that smaller banks who do not wish to move to Basel II or Basel IA can continue to operate under Basel I.
More information about Basel IA and Basel II can be found in this FDIC site, OCC site and Basel 2 implementation site.