Invoicing

On-site invoicing is a method of invoicing that consists of invoicing the client for the time and resources actually used by the service provider, generally at an hourly or daily rate.

The method of invoicing on a time-based basis offers several advantages.

Invoicing is simpler, and performance is easier to calculate by referring to timesheets.

Time and materials management also offers great planning flexibility. It is easier toadjust resource capacity planning according to requirements, and to resort to subcontracting if delivery times are tight. There is less risk of cost overruns than with fixed-price invoicing.

This method of invoicing also guarantees a commitment of resources to ensure the availability of the necessary resources, which simplifies project management.