Income certificate vs ITR: when the Tehsil asks for both

An income tax return states what one person declared to the tax department. An income certificate states what a household earns, as certified by the Tehsil. They are not interchangeable.

In short

An ITR is a self-assessment by one person for tax purposes. An income certificate is a revenue officer's finding about a household. A scheme asking for the second does not accept the first, though an ITR is good supporting evidence of the figure.

Different documents, different questions

An ITR is a self-assessment filed by an individual for tax purposes. An income certificate is a finding by a revenue officer about a household. A scheme asking for an income certificate is asking for the second, and an ITR attached instead does not answer the question: most obviously because it covers one member, not the family.

Where the ITR does the work

As proof within the certificate application. For a salaried or business household the ITR is the strongest income proof you can attach, and it makes verification quick. Attach the return for the relevant year along with the computation, not only the acknowledgement page.

When the figures differ. A household figure higher than one member's ITR is normal. The certificate adds every earner. A household figure lower than a single ITR is a contradiction, and it is the version that gets queried. Check your arithmetic before submitting.

If nobody in the family files

That is common and it is not a problem. A self-declaration, land records and a ration card are the standard route, and the absence of a return is not treated as concealment where the declared income is below the filing threshold.