7 December 2023 –​Due date for deposit of Tax deducted/collected for the month of November, 2023. However, all sum deducted/collected by an office of the government shall be paid to the credit of the Central Government on the same day where tax is paid without production of an Income-tax Challan

15 December 2023 –​Due date for furnishing of Form 24G by an office of the Government where TDS/TCS for the month of November, 2023 has been paid without the production of a challan

15 December 2023 –​Third instalment of advance tax for the assessment year 2024-25​

15 December 2023 –​​Due date for issue of TDS Certificate for tax deducted under section 194-IA, section 194-IB, section 194M in the month of October, 2023

​15 December 2023 –

​Due date for furnishing statement in Form no. 3BB by a stock exchange in respect of transactions in which client codes been modified after registering in the system for the month of November, 2023

15 December 2023 –​​​Due date for issue of TDS Certificate for tax deducted under section 194S in the month of October, 2023

Note: Applicable in case of specified person as mentioned under section 194S

30 December 2023 –

​​Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194-IB, section 194M, section 194-IA in the month of November, 2023

30 December 2023 –

​Furnishing of report in Form No. 3CEAD for a reporting accounting year (assuming reporting accounting year is January 1, 2022 to December 31, 2022) by a constituent entity, resident in India, in respect of the international group of which it is a constituent if the parent entity is not obliged to file report under section 286(2) or the parent entity is resident of a country with which India does not have an agreement for exchange of the report etc.

30 December 2023 –​Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194S in the month of November, 2023

Note: Applicable in case of specified person as mentioned under section 194S

31 December 2023 –

​​Filing of belated/revised return of income for the assessment year 2023-24 for all assessee (provided assessment has not been completed before December 31, 2023)