According to A21, G-7-a, the rate to use on a particular award is "the negotiated rates for F&A costs in effect at the time of the initial award...".  Do you consider "the time of the initial award" to be the project start date or the date that the award was signed?
Thank you,
Fran Solano Simpson
 
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  Frances Solano Simpson
  Director, Office of Sponsored Programs
  University of Denver
  2199 S. University Blvd.
  Denver, CO  80208
  Phone:   303-871-4036
  Fax:  303-871-2623
  Email:  xxxxxx@du.edu
  Website:  www.du.edu/osp
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