NOTE: everything needs to be discussed and negotiated first. the default terms are placed to ensure such discussion takes place before job is awarded.
In pursuance to "Milestone Payments" as in Freelancer terms and conditions, first milestone payment needs to be deposited on Freelancer within a day, ibapi is awarded the project, failing which the awarding of the project by the seller will be deemed void and the offer by ibapi will be deemed to have been retracted. not be accepted by ibapi.
first milestone becomes payable after requirement analysis is done. requirement analysis is "Contract-style requirement lists" as defined under "Requirements_analysis" in wikipedia.
Explanation: this is essentially an upfront payment