The repayment of the interest portion of the EMI is allowed as a deduction under section 24 if the purchase or construction is completed within a period of three years from the end of the year in which the loan is taken under the head "income from house property" up to Rs. 2,00,000/- for self-occupied property and full amount of interest in case of let-out property provided that loss from such let out house property does not exceed Rs.2 Lakhs.

The repayment of principal amount of the loan can be claimed as a deduction under section 80C up to a maximum amount of Rs. 1.5 Lakhs. You can also claim deduction under Section 80C towards payment made for stamp duty, registration fee and other expenses for the purpose of transferring the property in the name of the assessed. All these deductions however should not exceed the overall limit of Rs. 1.5 Lakhs. However, deduction under Section 80C is not available in respect of payment made towards the cost of any addition, alteration, renovation or repair carried out after the issue of the completion certificate.