ETCS means

Tax Collected at Source (TCS) is income tax collected in India payable by the seller who collects in turn from the buyer and it is provided under section 206C of Income Tax Act, 1961 at the sale of some goods which are specified.

E - TCS  is the process of filing TCS returns through electronic media. It is necessary for government and corporate collectors to file TCS returns in its electronic form. Collectors (other than government) have the provision to file TCS returns in physical form or electronic form.