I assume you mean for 415 purposes, as there is no deduction?
As per Treasury Regulation 1.415©-1(b)(6), there is a deadline for employer contributions for those contributions to be considered “allocated” for a given limitation year. For tax-exempt entities, there is a special deadline, which is no later than the 15th day of the 10th calendar month following the end of the calendar or fiscal year in which the particular limitation year ends. Assuming they are on a calendar fiscal/limitation year, this means that any contribution after October 15th of 2016, would have to be treated, for 415 purposes, as being allocated in whatever limitation year actually contributed.