Collection of tax at source mandates sellers to withhold and remit tax on specified goods with strict payment and certification duties. Sections 44AC and 206C prescribe that at the point of first sale certain percentages of the purchase price for specified goods are to be deemed profits of the buyer and that designated sellers must collect income-tax at source at prescribed rates at the earlier of debiting the buyer's account or receipt of payment. Collected tax must be remitted to government within seven days, certified to the buyer within ten days, treated as tax paid for the buyer on production of the certificate, and non-payment or non-collection renders the seller liable for tax, interest and assets charge, subject to limited exemptions by assessing officer certificate.