The FDIC is amending its assessments regulations to implement the one-time assessment credit required by the Federal Deposit Insurance Act (FDI Act), as amended by the Federal Deposit Insurance Reform Act of 2005 (Reform Act). The final rule covers: The aggregate amount of the one-time credit; the institutions that are eligible to receive credits; and how to determine the amount of each eligible institution's credit, which for some institutions may be largely dependent on how the FDIC defines "successor" for these purposes. The final rule also establishes the qualifications and procedures governing the application of assessment credits, and provides a reasonable opportunity for an institution to challenge administratively the amount of the credit.