'my understanding', is there are two answers to this question.
1. as everyone else has answered, and they are assuming you are classifying yourself as an investor
the 2nd is if you are classified as a trader.
You may then claim capital losses against your income
Once you 'declare' yourself to be a trader, there is no turning the clock back to be an investor
So in this situation, all losses and gains (Whether capital gains or interest) are subtracted/added to your income to arrive at a gross figure to be taxed.
