principal should be excluded from computation of turnover of sales. Deduction of turnover worth Rs.305,04,14,268/- (Rupees Three hundred and five crores four lakhs fourteen thousand two hundred and sixty eight only) was claimed as sales by the respondent to its principal for which the principal has paid tax. These contentions were accepted by the First Appellate Authority and the turnover so covered by Form 25F declarations were deducted from the total turnover conceded int eh annual returns of the respondent. According to us this was not correct. As rightly pointed out by the respondent, Sec. 6 (1) and Sec. 8 (f) provide different modes of assessment. As per Sec. 6 (1) every dealer covered by Sub-section (1) shall be liable to pay tax on his sales or purchases of goods as provided in the Act and the liability to pay tax shall be on the taxable turnover. The words, 'on the taxable turnover' were introduced by Act 39 of 2005 w.e.f. 1.4.2005. Thus, as per Sec. 6 (1), a dealer is liable to pay tax on his taxable turnover . Rule 10 provides for determination of taxable turnover . Sub rule (1) of Rule 10 of the Rules provides for deduction of certain amounts specified therein from the total turnover of the dealer to arrive at the taxable turnover. Sub-clause (h) (I) & (ii) of Rule 10 (1) provide for deduction of turnover of sales or purchases made by a dealer through his agent in respect of which tax has been paid by the agent and turnover of sales or purchases made by an agent on behalf of any principal in respect of which tax has been paid by the principal.