​As per the presumptive taxation scheme of section 44AD, income of a taxpayer will be computed @ 8%/6% of the turnover or gross receipt and from such income can the taxpayer claim any further deductions?
Under the normal provisions of the Income-tax Law, taxable business income will be computed after allowing deduction in respect of expenses which are deductible as per the Income-tax Act and after disallowing expenses which are not deductible as per the Income-tax Act.

In case of a person who is opting for the presumptive taxation scheme of section 44AD, the provisions of allowance/disallowances as provided under the Income-tax Law will not apply and income computed at the presumptive rate of 8%/6% will be the final taxable income of the business covered under the presumptive taxation scheme and no further expenses will be allowed or disallowed. However, the assessee can claim deduction under chapter VI-A.

​While computing income as per the provisions of section 44AD, separate deduction on account of depreciation is not available, however, the written down value of any asset used in such business shall be calculated as if depreciation as per section 32​ is claimed and has been actually allowed. ​