Budget to Actual Adjustments. The Authority shall true up budgeted amounts collected from the Activity Participants to actual expenditures annually following the end of each fiscal year. Any over-payments between budgeted and actual expenditures, taking into account any year-end carryover reserve established by the Management Committee, shall be credited or refunded to each Activity Participant in equal shares for the period through February 28, 2017, and for each year thereafter, based upon its Participation Percentage. Each Activity Participant shall be billed for any under-payment following the true-up, with payment due thirty (30) days after the invoice is received.