Assessee have the option to select which one to tax. Tax will be computed in both the cases & the option with lower tax will be selected. If you want more detailed answer ask me.
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@ Bharat Marshal
I think that option is available only when assesse owns 2 house property and both are self occupied. In that case assessee has a option to choose one is SOP and other is Let out.
And also From Finance Act 2019, it has been ammended as if assessee has 2 House property and both of them is not let out then it is mandatory to treat both property as SOP.