To use Earned Value Management (EVM) effectively in controlling cash flow within your project plan, carefully quantify defined methods for accomplishing work on the project within a certain timeframe. To determine the value (EV) for each completed element total the percent complete times the budget at completion.
Compare this figure with the planned value or (PV) and actual cost (AC). Only by adding the EV comparison, will you be able to determine the financial health of your project. This comparison will indicate if your cash flow is over budget, under budget, and it will give you a frame of reference by which you can determine where you need to reign in your spending.
Control your cash outlay by staying within the same range the PV versus the EV. Instead of agreeing to pay 100 percent of the AC for the specific goods or service you receive as a part of your project, set up markers at the PV level and when the EV hits that marker, release these funds as a percentage payment.