Return of loss meaning in income tax refers to the fact that in case there is a loss of income in a year, then it is not mandatory for individuals to file the Income tax return. If you are someone who is self-employed or runs their own business, then they will have to file the ITR even if they suffer a loss.
Under the return of loss section 139(3), an individual can skip filing the ITR for a particular assessment year in which they suffered a loss of income. This is not applicable to the firms, businesses, or companies. They have to file the ITR every year, even in the event of a loss.
This section says that if your intention is to adjust the future profits against the loss incurred in the current year, then you have to file an ITR. This will reduce your tax burden in the future years. But if you don't fill out the Income Tax return, then you won't be allowed to balance the loss and profit. The ITR has to be filed in the following situations: