You can get a tax refund for buying a house with a loan, but you must pay off the loan before you can get a tax refund. After paying off all the loan principal and interest, you can go to the real estate trading center in the district or county where the property is located to cancel the mortgage with the bank's loan settlement certificate and other real estate rights certificate of the collateral. Don't lose the loan contract and IOU. Apply for a mortgage loan. The loan contract and IOU signed by the bank are all important legal documents. As the loan term can be up to 30 years, as a borrower, you should properly keep the contract and IOU.