Intro
The “retainer,” if any, is the amount paid down or in advance for non-standard services and expenses.
Fee for services
It is not the fee for non-standard services. The fee is what is charged after the services are provided.
Cost for expenses
It is not the cost for expenses. The cost is what is charged after expenses are incurred.
Note
The flat fee for services is a type of retainer, where the fee has already been determined in advance.