This is one of two assumption of discounting factor until examiner specifies.
“All cash flows occur at the start or end of a year. Although in practice many cash flows accrue throughout the year, for discounting purposes they are all treated as occurring at the start or end of a year. Note that if today (T0) is 01/01/20X0, then 01/01/20X2 is (T1).”
Can you explain this assumption? And what is drawback if we do not assume this.