Dear Ashok.
1) Please recheck the intimation received u/s 143(1) with the returned income tax filed, as there is most possibility that the returned income filed by us does'nt match with intimation , TDS we claimed , SA tax paid by us, and Advance tax paid by us does not reflect in the intimation.
I n some case they don't give the full credit of TDS we claimed.
& on that bases they calculate the tax liability on their assessed income & raised the demand of tax along with the intereest u/s 234B & C.
If this kind of situation arise then we have to file a rectification letter as u/s 154 of the Act, along with the proper supporting (to be enclosed) like TDS Certificate, Advance Tax & SA tax Challans, or Return acknowledgement copy along with the tax calculation sheet, with te rectification letter.
Some time we also have to submit the original copy of TDS Certificate/ Tax challans as per the Department requirement.
2) If there is no case of rectification i.e the demand has been arise on account of shortfall of tax paid by us. then we have to pay the demand as usual as we pay Self Assessment Tax (challan 280)