Ownership and possession must to claim deduction

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Ownership and possession is a must to claim deduction on home loan interest: You have to report income/loss from property ONLY if you are the owner of that property. An owner is a person who owns the legal title of the property and has the right to receive income from it.
Solely Owned Property: If you are the sole owner of a property, then you should report the entire income/loss from the property in your income-tax return.
Jointly Owned Property: A property which has more than one owner is a jointly owned property. The owners are called co-owners and their share in the property is generally documented in the registry. Depending on the share, co-owners should report the income from house property separately in their returns. Suppose you own 30% of a property, then you should report 30% of the income in your return. In case of jointly-owned self-occupied property, both you and the other owner can separately claim home loan interest deduction up to Rs 1.5 lakh in your respective income-tax returns.