@ Nisha Yadav:
Total income means total income from all sources and not business income only.
Wrt 44AB:
If the turnover exceeds Rs 1 crore.
OR
If turnover is less than 1 crore and have opted to show income below the presumptive rate of 8% of the turnover AND the total income exceeds basic exemption limit (Sec 44AD)
OR
If turnover is less than 1 crore and have opted to show income below the deemed profits specified under Sec 44AE
The AND condition is very important in Sec 44AD I.e. even if the income is shown below 8% but if the total income does not exceed the basic exemption limit then too the tax audit u/s 44AB is not liable.
Maybe you must have got confused between showing income exceeding 8% and income below 8%.
You can always opt for income exceeding 8% (As read u/s 44AD).
Sec 44AB rw Sec 44AD : Tax audit is applicable only and only if income is shown below the presumptive rate of tax I.e 8% AND the total income exceeds basic exemption limit