Write ‘master’s degree’ in lowercase when you use it as a general term. For example: ‘She earned a master’s degree in history.’ Capitalize it when it is part of a formal degree name, such as ‘Master of Arts’ or ‘Master of Science in Nursing.’ The capitalization guide covers the common cases.
The same rule covers other degrees. ‘Bachelor’s degree’ and ‘doctoral degree’ stay lowercase in general use. ‘Bachelor of Science’ and ‘Doctor of Philosophy’ take capitals as formal names. Keep the pattern steady through your document. Readers notice when the same term changes case from one paragraph to the next. See when to capitalize a master’s degree for more examples.
Abbreviations vary by school and style guide. M.A., M.S., MBA, and Ph.D. are standard forms. Pick one style and use it every time. Do not mix ‘M.S.’ and ‘MS’ in the same document.
Style guides settle the close calls. The Chicago Manual of Style and the Associated Press Stylebook both cover degree names. Your school may have its own guide. When in doubt, check the writing aids for students page or ask your instructor which guide to follow.

