Income Tax demand paid under wrong minor head

File a Letter to Assessing Officer mentioning the reason for the mistake. Officer will give the credit and will update the same in system

How can I file a letter?

GO FOR CHALLAN CORRECTION

If u file/submit the letter in Income Tax department they will update in their system accordingly but for that u have to first intimate them about the issue then only they will act. Dont go for challan correction it will take long procedure. I m from Mumbai, I have rectified many such issues of my firm.

Hi I just looked in internet. Challan correction is mostly related to correction of challan in eTDS returns.

Mine is related to Challan no 280. ie for income tax return. Instead of minor head 400 i did under 106. 

Can challan 280 also be corrected?

No u cannot correct the challan