NIH-wide, approximately 83 percent of spending went toward extramural research in fiscal year (FY) 2017. See NIH Extramural & Intramural Funding: FY 2017 Operating Plan.
At NIAID, the distribution is similar. In FY 2016, NIAID spent about 82 percent of its budget on extramural research. The remainder was spent on intramural research and research management and support.