What is billable revenue?

Billable Revenue is monetary income that is promised to be paid (billed in arrears) without anything owed upfront at the time the agreement is made (typically by means of a signed contract). An example of this would be signing up for and receiving a service and being billed for it after the service is delivered. The term is often used by the billing-party and typically a salesperson. It is money that is expected to be received (from a sale) without actually being paid yet.