This new FSP is effective for financial periods ending after November 15, 2008. This would be for the 2008 10K for calendar year companies.
The FSP clarifies that FAS 161 is effective for any reporting period, annual or interim, beginning after November 15, 2008. There was some controversy over whether FAS 161 was to be applied in the interim periods and this FSP claifies that it does.
This FSP applies to credit derivatives within the scope of FAS 133, hybrid instruments with embedded credit derivatives and guarantees within the scope of FIN 45.