Home Loan

sec 44AD and home loan both are diff subjects. 

Mere saying that after availing 44AD you are not subject to paying tax, is wrong, the section provide the audit criteria that below 8% he must get audited u/s 44AB, and it does not ask the assessee to decline his net profit upto 8% under shadow of sec 44AD.

4.5 Lacs *8/100=36000, how the person can satisfy the department in case of any investigation, that what is his source of living,  how does he manage to live with 3000/- pm, as a business person?

for home loan you have to get in touch with bank about creditablity of borrower, mere incometax return is not a criteria for home loan, but they calculate creditability view with repayment capacity / networth etc.