Answer:
Not necessarily. It depends on the APR disclosed. If they are still accurate, then no new P-TIL disclosure is needed. If the APR went up, then you need to redisclose.
You should refer to 1026.19(a) for more information. Also, the Philadelphia FRB had a great article on the accuracy issue. You can find it here.
First published on BankersOnline.com 4/2/12