6. Sums deductible from gross profits –
The following sums shall be deducted from the gross profits as prior charges, namely :
(a) Any amount by way of depreciation admissible in accordance with the provisions of sub-section (1) of Section 32 of the Income-tax Act, or in accordance with the provisions of the agricultural Income-tax law, as the case may be : Provided that where an employer has been paying bonus of his employees under a settlement or an award or agreement made before the 29th May, 1965, and subsisting on that date after deducting from the gross profits notional normal depreciation, then the amount of depreciation to be deducted under this clause shall, at the option of such employer (such option to be exercised once and within one year from that date) continue to be such notional normal depreciation;
(b) Any amount by way of [(Note: Subs. by Act 66 of 1980) development rebate or investment allowance or development allowance] which the employer is entitled to deduction from his income under the Income-tax Act ; (c) Subject to the provisions of Section 7, any direct tax which the employer is liable to pay for the accounting year in respect of his income, profits and gains during the year ;
(d) Such further sums as are specified in respect of the employer in the [(Note: Ibid) Third Schedule].