I'm looking for a sanity check here as this sounds odd:
100% of mortgage interest for a Buy To Let property is now allowable as a deduction against rental income.
So this incentivses you to take out a BTL mortgage with as high interest rate as you can find to get a larger deduction against your tax bill each year.
This assumes you rent the property for the duration of the mortgage, so you do not get landed with that higher rate with no deduction down the line.
100% of mortgage interest for a Buy To Let property is now allowable as a deduction against rental income.
So this incentivses you to take out a BTL mortgage with as high interest rate as you can find to get a larger deduction against your tax bill each year.
This assumes you rent the property for the duration of the mortgage, so you do not get landed with that higher rate with no deduction down the line.