I will be starting a master's degree in applied mathematics in the U.S. this fall and am considering entering a Ph.D. program after this. The master's program lasts two years; I'd want to begin the Ph.D. program immediately after, in the fall of 2019. In order to do that, I'd need to apply to programs before the end of 2018. Would Ph.D. program admissions committees take into account courses that I'd be planning to take in the spring 2019 semester? Those courses would probably be the second halves of two-course sequences I'd begin taking in the fall 2018 semester. Would they even take into account courses from that semester? I'm planning on writing a thesis; would it be advisable to finish it well before the application deadline at the end of 2018, even though I'd probably be able to write a better thesis after taking more courses?