Implication of late payment of tax

I think only interest shall be payable.

But the authorities have the power to condone the delay.

After making the payment of the Intimated amount. Write a letter stating that u have paid the amount due to the assessing  officer along with CPC with the copies of Intimation and the tax paid counterfoil. and for the deadline which u have not met nothing ll be done. If they catch they ll send one more intimation asking u to pay the amount of interest.