18 May 2014
if there has been any tds deduction against salary payments in first three quarters, you will have to file 24Q in 4th quarter so that you can generate form 16.
though there wont be any late filing fees, but if dont issue Form 16 in time, penalty for late issue of Form 16 can be levied..
20 May 2014
if you have not deposited any tds then TDS return not generated by the mostly softwares. if software generated the return pls deposit the same.