40. Except in a Community or in a county corporation, a notice of the share of the expenses contemplated by section 39 is sent annually to each municipal corporation at the time fixed by the parties or, failing agreement, by the Commission.
Such share is payable within ninety days of the date of its sending.
Such expenses may be included in those of the fiscal year during which they must be incurred.
1971, c. 50, s. 40; 1973, c. 31, s. 20; 1975, c. 68, s. 17.