housing loan's interest deduction

My client, a central govt employee,  has availed a loan of Rs 10 Lacs from a commercial bank. The possession of the flat is likely by 2011. Loan was avialed prior to 1.4.2008. Can he avail deduction of interest , either 150000 or 30000 in his return for AY 09-10. Moreover , is the employer bound to take cognition of the interest paid while calculatng TDS for AY 10-11.

CA RAJ KUMAR GOEL, MOGA - PUNJAB- 09814003257