The Uniform Guidance in 2 CFR 200.77 defines "period of performance" as the time during which the non-Federal entity (sub-grantee) may incur new obligations to carry out the work authorized under the Federal award.  The period of performance represents the one-year period for which the award was made.  The Grant Award Package (Statement of Grant Award) provides the award period for each grant (eg. July 1, 2019-June 30, 2020).