One of my most successful billing models has been the flat rate with a achievement kicker on the back end. I bid out a particular project on a flat rate basis and then indicate to the client that the last twenty-five percent of the fee does not need t be paid unless certain goals or benchmarks are achieved. The client receives cost certainty, the client is also assured that their attorney has a stake in the outcome. I have achieved an excellent return on investment under this billing model. If the fee is charged on a flat rate, non-refundable basis, you do not have to place the fee in an IOLTA account. Instead, the fee is earned immediately.