On each year’s premium rate page, you can find the premium rate manual, if available, which lists that year's premium rates and describes, with extensive supporting documentation, how we determine these rates. These manuals are also available dating back to 2005 in the Previous rates section.
Important update: We recently experienced a printing error with some letters. We have identified and are resending the affected letters. If you need your letter immediately, please call us and we can also re-send it by secure email.
