National Science Foundation (NSF) has two-month salary cap known as the two-ninths-rule:
``Summer salary for faculty members on academic-year appointments is limited to no more than two-ninths of their regular academic-year salary. This limit includes summer salary received from all NSF-funded grants.''
What would happen if an individual has already reached the maximum limit of two months of summer salary from NSF and a new proposal is being recommended for funding? While the distinction between "current and pending" support should make this situation clear, is it necessary for the principal investigator (PI) to communicate this separately with the program officer? Moreover, could this potentially result in the rejection of the new proposal?