Which businesses are not eligible for presumptive taxation scheme of section 44AD?
​​The scheme of   section 44AD is designed to give relief to small taxpayers engaged in any business, except the following businesses:

Business of plying, hiring or leasing goods carriages referred to in sections 44AE.
A person who is carrying on any agency business.
A person who is earning income in the nature of commission or brokerage
Any business whose total turnover or gross receipts exceeds two crore rupees.​

However, if the amount of cash received during the previous year does not exceed 5% of the total turnover or gross receipt of such year then the threshold limit for total turnover or gross receipt shall be taken as Rs. 3,00,00,000 instead of Rs. 2,00,00,000. The receipts through the mode of cheque or a bank draft which is not an account payee, shall be considered a receipt in cash for this purpose. [Applicable w.e.f. Assessment Year 2024-25]

Apart from above discussed businesses, a person carrying on profession as referred to in section 44AA(1) ​is not eligible for presumptive taxation scheme under section 44AD. ​