Having high turnover does not necessarily mean, you’ll get a notice from the Income Tax Department. If your turnover is above the threshold, a tax audit may be applicable and you’ll be required to get your books of accounts audited from a practising charted accountant.
In case you get a notice, there is no need to panic if you have reported all your incomes and financial activities in the ITR. Notices/intimations are sent in the normal course of processing tax returns. It might be for routine inquiry or a request for clarification. So you can file repose accordingly, there is no need to worry!