How to response ao for notice u/s 143(1)a

1) See whether the 26AS statement is updated - down load from traces or efiling website

2) Write a letter to your AO attaching the 26AS and  request him/her to rectify the return taking all credits. Thats it

3) those who have filed return online -should rectify online with option a - tax credit mismatch. There are 10 rows each for TDS, TCS and TI to fill and/or correct.

Beyond which you have to make application to AO to rectify.

Normally, since the error was on your end, you would have been required to file a revised return. But since, the return is tmed barred, the only option is to approach the Assessing officer with a rectification request along with all necessary proofs of TDS. 

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