Returns

If the assessing authority has reason to believe that the turnover of sales or the turnover of purchases of any dealer is likely to exceed or has exceeded the taxable limit as specified in sub- section (7) of Section 3, it may, by notice served in the prescribed manner, require such dealer to furnish return as if he were a dealer liable to pay tax but tax shall be payable by him only if it is due under any provisions of this Act.