Due date for Tax return if tax audit require

Sumit Gupta (120 Points)

23 July 2018  
If a taxpayer is filing his return U/s 44AD (Presumptive basis) for the last two years.. this year he has profit of less than 8% and he is require tax audit...
In that case what will be the due date for filing of income tax return.
31st July or 30th Sep.??