is it mendatory to set off losses in the year when there is income ?
Yes it is mandatory
still it can be c/f to next year when we have income but don't want to setoff.
In case there is income there has to be a set off. In case set off is not done then the amount which is not set off from the income cannot be set off in future. However any amount above the income that could otherwise also have not been set off because the income was not so much to set off may be set off in the coming 8 yrs
also can loss be setoff proportionately that is upto 8 a/y's thoda thoda kar liya each year instead of whole in 1 year .
no thats is also not possible