Income Tax Department — tax not given on rental as no rental agreement done

Address:

Gurgaon, Haryana, 122001

I would request a raid on house no 877 sector 22b gurgaon haryana where owner is not doing any rental agreement and taking rent in cash. He has 2 houses in gurgaon 3 houses as per him in delhi where he do not execute agreement and take cash rent to avoid paying tax on rent. He is businessman and owns 3 to 4 electrical supply shops in delhi gurgaon. Also he sometimes get money transfer to his workers account. Look forward an enquiry on same as in gurgaon his monthly rental income is 65000 per month