UPSC does not deduct marks for bad writing. But the handwriting of the candidate should be easily legible. If it is not understandable, then the board might deduct a specific number of marks from the total marks secured by the candidate. The reason is that the Prelims exams has objective type questions and there is no writing in the interview. Legible handwriting is not only for UPSC CSE examination but also for other examinations and daily practices. There are some exams wherein handwriting helps the candidate score more. So, developing good and legible handwriting is always important for a candidate.