The finding is as a result of an academic study of survey of 493 buy-to-let investors.
It found 49% of respondents do not receive sufficient rental income to cover their interest payments but have not opted to sell their investments.
Some 44% of respondents say they can afford to absorb the loss they will incur if they sell their properties but have opted not to do so.
It also found 57% of landlords bought properties near where they lived.
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