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Difference between a mortgage and buy-to-let in UK
Another factor that makes Buy to let more expensive is the risk involved. With a buy to let you are dependent on finding a tenant that will keep regular payments. if the property is left empty you need to finance the mortgage yourself putting you under financial strain and raising risk. Also as Chis mentioned they are regarded as a business enterprise, If the mortgage was to be taken by a business that would be very high risk for a bank as the business could dissolve leaving the bank out of pocket. Because of this it can be very difficult to get a buy to let through a business unless you are moving from a personal portfolio. For a regular mortgage these risks don't exist so this is reflected in lower interest repayments. It's because of these differences in risk that banks created buy to let so they can better manage those risks.