Interest paid on Housing Loan: U/S 24(1) Interest paid/accrued on money borrowed for acquisition/construction is allowed as an deduction, the interest amount up to a maximum of Rs. 1,50,000 p.a. or the actual interest paid, whichever is less is allowed as deduction.
To claim deduction, construction/acquisition must be completed within 3 years from the end of financial year in which the loan was borrowewd.
Principal paid on Housing Loan: U/S 80C Aggregate of amount paid/incurred/invested towards repayment of housing loan principal towards self-occupied residential property can be claimed up to Rs. 1,00,000/-.
Aggregate of deduction U/S 80C, 80CCC and 80CCD should not exceed Rs. 1,00,000/-.
If you have still doubts, then plz feel free to revert for further clarification.