RECTIFICATION REQUEST

Demand might be due to 194H, CPC might have taken it under other sources..

SHOULD FILE ITR UNDER ITR 4 OR ITR 3

You can use ITR-4 but show the 194H under the income from other sources..

Commission being not a business income can use ITR-4.If you consider commission under business income then you just use the ITR-3..

But carefully observe the tax calculation.Find out the reason from 143(1).

If problem is only Tds mismatch then you may file rectification..

You can use revised return as well before 31st March