2 CFR 230.40 - Effective date of changes.

§ 230.40 Effective date of changes.
The provisions of this part are effective August 31, 2005. Implementation shall be phased in by incorporating the provisions into new awards made after the start of the organization's next fiscal year. For existing awards, the new principles may be applied if an organization and the cognizant Federal agency agree. Earlier implementation, or a delay in implementation of individual provisions, is also permitted by mutual agreement between an organization and the cognizant Federal agency.
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United States Code
U.S. Code: Title 31 - MONEY AND FINANCE
U.S. Code: Title 41 - PUBLIC CONTRACTS
Presidential Documents

Executive Order ... 11541