This final rule amends the HUDAR to implement miscellaneous changes necessary to update the HUDAR. These changes include a correction to the designation of Source Selection Authorities, limited delegation of Head of Contracting Activity authorities, incorporation of the HUDAR Matrix, addition of new clauses including clauses relating to labor categories and prices per hour, and post-award conferences. HUD is transitioning to the Department of Treasury's Bureau of Fiscal Services' Invoice Platform Processing System (IPP), and this final rule revises clauses related to payments and invoicing to take into account both the situations where invoicing and payment will not be made through the IPP and where invoices are required to be submitted electronically through the IPP. This final rule also clarifies that where funding has been made available for a contract, and the limit of the funding has been reached or the necessary funding modification is not in place, the contractor must stop performing work and may not start again until notified through a contract funding modification that funds are available to continue work. This final rule also modifies the proposed provision on post-award conferences to limit the clause to cases where a conference is required, and provides an alternate clause for attendance at such conferences via telephone or video conference. The rule makes certain administrative corrections, and incorporation of alternates to various clauses to allow for electronic invoicing.