Demand u/s 143

I WANT TO CLEARIFY MY CONCEPT .....IF ASSESMENT HAS BEEN DONE....AS IN MY CASE....THEN CAN I STILL FILE REVISE RETURN ....OR REVISE IT USING RECTIFICATION REQUEST BY UPLOADING FRESH  XML FILE..

If you have recevied demand raised in 143(1), and the demand raised by the department is acordingly proper, then you just pay the demand.

Also another option is, you can pay the demand then revise your return, then the department will again check your return and send you the intimation u/s 143(1) for return 139(5) i.e revised return.

So please check the amount of demand, and if found proper just pay it.  

no ..it has been raised because i have done an clerical error.....i need not to pay demand....i called cpc...she told regenarate X M L of return rectifying that error and file rectification request by uploading the same.....

submit rectification request in response ti cpc intimation u/s 143

If your mistake is related to any prepaid tax details..( Like wrong TAN no. Wrong amount of tds, or bsr code,challan no..), you can submit rectifucation request online by logging in/eservices/submit rectification request
Then it will ask assessment year, reference number which will be availabe in intimatio u/s 143(1)

Yes pradanya ji, ,  actually  client earned salary form 2 departments in the same financial year having different tan numbers.. I addeed up tds of both but quoted only single tan and employer details..  bcz both offices are united india ...so i did that mistake.