Report Buy to let mortgage rates rise in House prices and the economy Posted 11 hours ago 4 hours ago, spyguy said: S24 kills IO BTL. Its that simple. That 12k/m rent is going to be taxed at 30% or 40% Plus interest rate rises. That is going to be felt much more by highly leveraged IO. Seems to me that they are being thrown to the wolves. Do we have any idea of how many homes are held by IO BTL landlords?