II. – An advance representing 30% of the provisional amount of the grant may be paid on presentation of the document informing the Prefect that work has begun on the project or, in the case of authorisation for work to begin in advance, on notification of the order awarding the grant. III. – Payments on account, not exceeding a total of 80% of the estimated amount of the grant, may be paid according to the progress of the operation on the basis of supporting documents for payments made by the grant beneficiary. IV. – The balance of the subsidy is paid after submission of the supporting documents for the payments made by the beneficiary of the subsidy, which must be accompanied by a certificate signed by the mayor or the president of the public establishment for inter-communal cooperation or, in the event of application of the penultimate paragraph of article L. 2334-33 or the second sentence of the first paragraph of C of article L. 2334-42, the beneficiary of the grant attesting to the completion of the operation and the compliance of its characteristics with the awarding decree and stating the final cost of the operation and its final financing arrangements.