If you had a £800k mortgage on your residential property, and a debt free rental property valued at £350k, would you sell the rental property and use the proceeds to pay off part of your residential mortgage? Coming to the end of a 5 year fix on the residential property so will see a big jump in the interest, and therefore monthly mortgage repayments. The rental property is currently empty and would need maybe £40k investment before it can go back on the market, but would probably achieve a 6-7% yield pre tax. Have always seen rental property as an additional income stream/pension income for the future but with interest rates where they are, and the headache that now comes with being a landlord, AIBU unreasonable to cash up the rental and pay off part of the residential mortgage?