Section 4(2) in The Building And Other Construction Workers' Welfare Cess Rules, 1998
(2)Notwithstanding the provisions of sub-rule (1), where the duration of the project or construction work exceeds one year, cess shall be paid within thirty days of completion of one year from the date of commencement of work and every year thereafter at the notified rates on the cost of construction incurred during the relevant period.
