The CAS just released the dates for the Spring 2021 MAS-I Exam.  The exam will be given at PearsonVue sites from April 26th through May 3rd.

The announcement also includes the following important information:

“Registration for spring 2021 exams will open on December 15, 2020, and candidates who register early will have more options for selecting their preferred site, date, and time than candidates who register later in the registration window. While we understand that candidates who sat for a fall 2020 exam may not want to register for their spring 2021 exam before knowing their exam results, candidates whose plans for the spring sitting are more certain should take advantage of the opportunity to register and secure their Pearson VUE appointment when registration opens. The window for registration will close on April 9, 2021, and the refund deadline is April 16, 2021.”

I believe that this means that you should register for whichever exam you think that you are most likely to take in the Spring as soon as the registration window opens and schedule your exam with PearsonVue as soon as possible.   If you end up having to change later you will have to cancel your scheduled slot and try to obtain a new one, but at least if you are correct about which exam you will take then you will have locked in an appointment while the most flexibility for choosing appointments is available.

The release time for Fall 2020 results is still listed as “during Q1 2021″.