If a client likes your demo, they may invite you to audition. In the 21st century, you can download the audition script, record the audition at home, and then send the results to your client over the Internet. Prepare yourself for a life of constant auditions: Even successful voice pros may do many more auditions than actual jobs. But if enough jobs come your way, it's worth it.
Another factor to consider is how the project is being used and in which medium. If you record a commercial that’s airing nationally on television, then that is a larger rate than a regional television commercial specific to a certain market. The voice-over spot you worked on is being seen by more viewers nationally as opposed to regionally, which warrants more compensation. You should not only consider your session fee, but also get the specifics on how the voice-over is being used. My personal opinion is to avoid “in perpetuity” usage because as your career develops, something which was not a conflict in the past could be in the future. If the spot you had conflicts with another brand in which you are auditioning, this could become a conflict that was unforeseen when you initially booked and recorded the job.
Always update yourself on industry standard rates. I recommend reviewing the union rates set forth by SAG-AFTRA. Voices.com also offers a rate card as well Voice-Over Resource Guide. Upon viewing these rates you may find, based on your current experience, you fall a little lower or higher than said rates. Maybe you have a great deal of experience in the commercial voice-over world, but now you’re branching out into narration, e-learning or audiobooks, so your voice-over rates may be a bit lower for that genre as you find your footing. The most important thing is that you have a baseline rate for yourself and you’re comfortable and confident stating this rate to a client. It’s beneficial to first ask your client’s budget and proceed from there. While stating your rate, also take into consideration edits and pick-ups. It’s customary to include one free round of edits in your rate, but any edits or pick-ups past that incur a fee.