See also March 2015 NSF Update: Changes to Notifications/Requests
NSF Limits on Salary - January 2009
There has been a major revision of NSF’s salary reimbursement policy. In general, the Foundation will now limit salary compensation for senior project personnel to no more than two months of their regular salary in any one year. This limit includes salary compensation received from all NSF-funded grants. This change moves away from the concept of summer salary and allows for reimbursement of two months of salary per year whenever appropriate during the year.
NSF online System: FastLane
The NSF proposal preparation policy:
Reference the Current NSF Grant Proposal Guide for the currently applicable policy