The HSN (Harmonised System of Nomenclature) code for tea powder is 0902. This heading includes tea, whether or not flavoured.
Here is a description: flavored
09: Coffee, tea, mate and spices
02: Tea, whether or not flavoured
Specifically, tea powder can be classified under:
0902.10: Green tea (not fermented) in instant packing of not exceeding 3 kg
0902.20: Other green teas (not fermented)
0902.30: Black tea (fermented) and partially fermented teas, in instant packing of not exceeding 3 kg
0902.40: Other black teas (fermented) and other partially fermented teas
For GST purposes in India, the GST rate for tea classified under HSN code 0902 is generally 5%.