Outside Delhi dealers must file EC-III reporting Merchant ID, registration, turnover, CST and total sales to Delhi consumers. Report sales by outside dealers to Delhi consumers on the EC-III form, providing Merchant ID and Registration No./TIN, dealer name and principal place of business, address and state, quarter, sale turnover excluding tax, CST amount, total turnover including tax, and a unique ID plus signature, name, designation and date to validate the submission.