When must a re-negotiation notice be sent to the producer (or advertising agency)?

A renegotiation letter must be sent 60 to 120 days
(two to four months) prior to the end of the maximum period of use. Check your
pay stub to find the end date of the maximum period of use (MPU), and count
back 60 to 120 days to establish when you or your agent must send the
notice. The letter should be sent to the producer (ad agency) listed on your
employment contract. Sending the letter gives the performer the right to
renegotiate new rates or to say he/she does not grant the right to continued
use of the commercial. It is advisable to send a copy of the letter to the
Guild at the same time.

If your agent does not send a
renegotiation letter, and the commercial is renewed for an additional 21
months at the same rate, he/she may not take a commission.