EC - FWC services Dec 2018  Contract no: [complete]  payment of 20 % of the price referred to in the relevant specific contract. The contractor (or leader in the  case of a joint tender) must send the contracting authority an invoice for the pre-financing payment.  The contracting authority must pay the pre-financing within 30 days of receiving the invoice.  A clearing of the pre-financing will be done with the (first) interim payment or the balance payment, as  applicable. By derogation of this article, other clearing conditions may be established in the specific  contract if considered necessary by the nature of the services. 1. Different options are opened, depending on the amount and duration of the specific contracts: Option 1:  No interim payment for specific contracts of less than EUR 25,000. Option 2:  One interim payment for specific contracts having a value equal or bigger than EUR 25,000  and a duration of less than six months: The contractor (or leader in the case of a joint tender) may claim an interim payment of up to 80% of the  price referred to in the relevant specific contract in accordance with Article II.21.6.  The contractor (or leader in the case of a joint tender) must send an invoice for the interim payment as  provided for in the tender specifications, accompanied by the following: Option 3 : two interim payments for specific contracts having a value equal or bigger than EUR 25,000  and a duration of six months or more. The contractor (or leader in the case of a joint tender) may claim a first interim payment of up to 40% of  the price referred to in the relevant specific contract in accordance with Article II.21.6.  The contractor (or leader in the case of a joint tender) must send an invoice for the first interim payment  as provided for in the tender specifications, accompanied by the following: The contractor (or leader in the case of a joint tender) may claim a second interim payment of up to 40%  of the price referred to in the relevant specific contract in accordance with Article II.21.6.  The contractor (or leader in the case of a joint tender) must send an invoice for the second interim  payment as provided for in the tender specifications, accompanied by the following: 2. The contracting authority must approve any submitted documents or deliverables and pay within 60  days from receipt of the invoice.  3. If the contracting authority has observations to make, it must send them to the contractor (or leader  in the case of a joint tender) and suspend the time limit for payment in accordance with Article II.21.7.  The contractor (or leader in case of a joint tender) has fifteen days to submit additional information or  corrections or a new version of the documents if the contracting authority requires it. 4. The contracting authority must give its approval and pay within the remainder of the time-limit  indicated in point (2.) unless it rejects partially or fully the submitted documents or deliverables. 6  relevant progress report or deliverable result, as stated in the specific contract.   relevant progress report or deliverable result, as stated in the specific contract;   relevant progress report or deliverable result, as stated in the specific contract;  I.6.2. Interim payments 