Purchasers shall be responsible for collecting from producers contributions due from the latter by virtue of the surplus levy and shall pay to the competent body of the Member State, before a date and following a procedure to be laid down by the Commission, the amount of these contributions deducted from the price of the milk paid to the producers responsible for the overrun or, failing this, collected by any other appropriate means.

Where a purchaser fully or partially replaces one or more other purchasers, the individual quotas available to the producers shall be taken into account for the remainder of the twelve-month period in progress, after deduction of quantities already delivered and account being taken of their fat content. This paragraph shall also apply where a producer transfers from one purchaser to another.

Where, during the reference period, quantities delivered by a producer exceed that producer's available quota, the relevant Member State may decide that the purchaser shall deduct part of the price of the milk in any delivery by the producer concerned in excess of the quota, by way of an advance on the producer's contribution, in accordance with detailed rules laid down by the Member State. The Member State may make specific arrangements to enable purchasers to deduct this advance where producers deliver to several purchasers.