If you want to sell the mortgaged house that has been repaid for 6 years, you need to determine the valuation of the current mortgaged house first. You can get a reasonable appraisal through a house appraisal agency or a real estate agent. Subtract the remaining mortgage amount from the valuation to get the current net value. If the remaining repayment amount exceeds the house valuation, then there will be negative assets, that is, the difference still needs to be repaid after selling the house. In addition to the net value, you need to consider the related handling fees and taxes when selling the mortgaged house. These expenses include agency fees, deed tax, stamp duty, etc. The agency fee is the fee agreed in the agreement signed with the real estate agency, which is usually charged according to a certain proportion of the transaction price of the house. Deed tax is a tax paid to the local tax authorities according to the transaction price of the house. Stamp duty is a kind of tax paid when a house sales contract is signed, and the amount is usually calculated according to a certain proportion of the total contract price.