b.A fee under Section 234F would be levied upto Rs 5000, if the return is filed on or before 31 March of the relevant AY. After that, the fine can go upto Rs 10,000.
c.Delayed returns cannot be revised. However, from FY 2016-17, a belated return can also be revised.
d.You cannot carry forward some losses that belong to the years for which you did not file returns. However, an exception is available for losses from house property that can be carried forward even if you file your returns late.