one of my client failed to file income tax ay 2011-12 and notice sent by department in correct address and finally passed ordered u/s144 read with 147 tax demand 5100/ for unexplanined cash deposits of 2699580/- which comes to Rs. 205996/ tread Taxable Income. Tax Payable 5110/- the same paid by assessee. how to reply to department drop 271 notice? pls any letter format ?