Demand notice by income tax

SIR, THE RETURN WAS FILED ON DUE DATE,...  DONT U THINK THAT ITS A HARDSHIP ON A TAXPAYER WHO HAS FILED A WRONG RETURN BY MISTAKE...

Sir if i am not wrong ,, revised return can be filed only before completion of the assesment...in my case assesment has been done as intimation u/s 143 (1) has been received which is demanding tax.

In your case, whether gross total income is wrongly entered or tds is wrongly entered or both. I think if you entered the gross total income wrongly, CPC is not allowing to reduce the income returned u/s 154.

You can file a rectification return and do the rectification , 

i suggest you to kindly contact income tax CPC helpline numbers... they also provide correct suggesstions... & after that go for revision or rectification...