2 CFR §1108.405

1. (a)Voluntary cost sharing means cost sharing that an entity pledges voluntarily in its application (i.e., not due to a stated cost-sharing requirement in the notice of funding opportunity to which the entity's application responds).
2. (b)Voluntary committed cost sharing means voluntary cost sharing that a DoD Component accepts through inclusion in the approved budget for the project or program and as a binding requirement of the terms and conditions of the award made to the entity in response to its application.
3. (c)Voluntary uncommitted cost sharing means voluntary cost sharing that does not meet the criteria in paragraph (b) of this section.