The IFOS full form is Income from other sources. As per section 56(1) of the Income Tax Act, it is considered the income that you earn from all other sources. In other words, if you are not able to declare the income under any head, then it will be considered under this head.
Income from sources other than salary, house property, business or profession, and capital gain is declared under the Income from other sources.
Here are some examples of Income from other sources:
Under Section 80TTA, there are some deductions on the interest income. Here they are: