Tax credit for second-hand goods permitted subject to proof and a least-of calculation on purchase consideration. A registered dealer who buys second-hand goods from a resident unregistered seller is entitled to a tax credit, subject to proof of payment and where the dealer is taxable on the subsequent sale. The allowable credit is the least of: input tax borne by the resident seller; tax fraction of the seller's original cost; tax fraction of the fair market value at purchase; or tax fraction of the consideration paid. 'Input tax borne' includes tax under the Delhi Sales Tax Act or this Act and applies only if the resident seller bought the goods in Delhi. If consideration exceeds two thousand rupees, credit is allowed in the period when the goods are sold.