According to the list, January and April have the highest number of holidays, while February, March and June do not have any.
The Tamil Nadu government on Wednesday announced the list of public holidays for government offices and commercial banks for 2021. The holidays announced are based on the Negotiable Instruments Act (1881), and do not include regular Sundays.
In the list of 23 holidays, 17 fall on weekdays while six fall on Saturdays and Sundays. The months of January and April have the highest number of holidays, with five each. February, March and June have no holidays, as per the schedule.
| Day | Date | Holiday |
| Friday | 01-Jan-2021 | New Years Day |
| Thursday | 14-Jan-2021 | Pongal |
| Friday | 15-Jan-2021 | Thiruvalluvar Day |
| Saturday | 16-Jan-2021 | Uzhavar Tirunal |
| Tuesday | 26-Jan-2021 | Republic Day |
| Thursday | 01-Apr-2021 | Bank Holiday |
| Friay | 02-Apr-2021 | Good Friday |
| Tuesday | 13-Apr-2021 | Telugu Ugadi |
| Wednesday | 14-Apr-2021 | Tamil New Year & Ambedkar Birthday |
| Sunday | 25-Apr-2021 | Mahavir Jayanti |
| Saturday | 01-May-2021 | May Day |
| Friday | 14-May-2021 | Ramzan |
| Wednesday | 21-July-2021 | Bakrid |
| Sunday | 15-Aug-2021 | Independence Day |
| Friday | 20-Aug-2021 | Muharram |
| Monday | 30-Aug-2021 | Krishna Jayanti |
| Friday | 10-Sep-2021 | Vinayakar Chathurthi |
| Saturday | 02-Oct-2021 | Gandhi Jayanthi |
| Thursday | 02-Oct-2021 | Ayutha Pooja |
| Friday | 03-Oct-2021 | Vijaya Dasami |
| Tuesday | 19-Oct-2021 | Milad-un-Nabi |
| Thursday | 04-Nov-2021 | Deepavali |
| Saturday | 25-Dec-2021 | Christmas Day |