How should I pay a Private Investigator?
Private Investigators will bill off a retainer, just like an attorney’s legal services. There may be some flat-rate services for a couple of tasks, yet in general, you should expect to pay a retainer for their services. If an investigator does not bill off a retainer and is unable to explain why or their billing processes, you may want to look elsewhere. Many states require Private Investigators to work from a retainer.