Contract number:  Service contract conditions of December 2018 I.5. PAYMENT ARRANGEMENTS  I.5.1  Pre-financing  Following signature of the contract by the last party and its receipt by the contracting  authority, the contractor (or leader in the case of a joint tender) may claim a pre-financing  payment of 30 % of the price referred to in Article I.4.1. The contractor (or leader in the case  of a joint tender) must send the contracting authority an invoice in paper format for the pre- financing payment. [The contractor (or leader in the case of a joint tender) must also provide a financial guarantee  equal to 30% of the total price of the contract.] The contracting authority must pay the pre-financing within 30 days of receiving the invoice.  I.5.2  Interim payments 1(a). The contractor (or leader in the case of a joint tender) may claim  a first interim  payment equal to 20 % of the price payable referred to in Article I.4.1 in accordance with  Article II.21.6. The contractor must send an invoice in paper format for the interim payment as provided for  in the tender specifications, accompanied by the following:  (a) a list of all  pre-existing rights to the  results or parts of the  results or a declaration  stating that there are no such  pre-existing rights , as provided for in Article II.13.4; (b) the first interim report , as specified in point 1.3 of the specifications (Annex I);  (c) statements of reimbursable expenses in accordance with Article II.22  1(b). The contractor (or leader in the case of a joint tender) may claim  a second interim  payment equal to 20 % of the price payable referred to in Article I.4.1 in accordance with  Article II.21.6. The contractor must send an invoice in paper format for the interim payment as provided for  in the tender specifications, accompanied by the following:  (a) a list of all  pre-existing rights to the  results or parts of the  results or a declaration  stating that there are no such  pre-existing rights , as provided for in Article II.13.4; (b) the second interim report , as specified in point 1.3 of the specifications (Annex I);  (c) statements of reimbursable expenses in accordance with Article II.22  2. The contracting authority must approve any submitted documents or deliverables and pay  within  60 days  from receipt of the invoice. 3. The contracting authority may suspend the time limit for payment specified in point (2) in  accordance with Article II.21.7. Once the suspension is lifted, the contracting authority shall  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.  7 