When the income of an individual taxpayer is below the basic exemption limit in a financial year, the tax liability is zero; thus, such individuals do not have to file any income tax return as per provision of Section 139(1) under the Income-tax Act, 1961. But if they file ITRs even when their income is below the basic exemption limit, it is termed ‘Nil Return’.
A nil income tax return is filed to show the Income Tax Department that you fall below the taxable income and therefore did not pay taxes during the year. Nil returns can be filed only when the income is below the exemption limit. As per the Income Tax Act, it is not mandatory for individuals earning less than the basic exemption limit to file an ITR.
Thus, individuals filing nil returns file it in their interest.
To show income tax return as proof of income
To claim a refund
Your total income without taking deductions into account could be above the taxable limit, but deductions might be below the minimum exemption limit. If you paid more in taxes than you needed to in the form of TDS, you must file an income tax return to claim a refund.
Filing a nil return is no different from filing a regular income tax return.
Individuals must file a nil return before 31st July of the subsequent Tax Year. The due date for filing a nil ITR is the same as a regular return. However, if the nil return is filed after the due date, it will be considered a belated return. In case of belated filing of nil returns, no late filing fees will be charged.
The following image summarises the key information related to nil ITR.

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