Hi Sujatha,
This is regarding your leave policy. Perhaps your policy does not permit the carryover of unutilized CL to the next calendar year, i.e., 2021. It's a general practice in most entities that CL is credited in advance in January of a new year and closed by December 31st. There's no uniform rule across all entities regarding CL; some follow 10 days, while others follow 12 days (on average, one day per month). Therefore, any unutilized CL remaining on December 31st either elapses automatically or is not allowed to be encashed. Consequently, employees with spare CL often rush to exhaust all days before December 31st.
There is no hard and fast rule as per statute; practices are followed by the entities concerned or at the discretion of the HoDs. The purpose of CL is for emergencies, sudden illness, etc. It is seldom utilized for only a couple of days. However, if there is no work pressure or official exigencies, and relaxation is permitted, there's no harm in allowing employees to exhaust all balance days before they elapse. In short, if the absence of concerned employees is not expected to cause any hardship or disturbance in their routine or official duties, and the HoD is satisfied, CL for additional days can be permitted.