If a married couple, one on a 20% and the other on 40% tax have a BTL mortgage can all the mortgage interest relief be claimed at 40% or is it split between both rates.?.
Assuming they each own 50% of the property then the income and expenses are split equally, leaving both with the same amount of taxable rental income. This income then gets taxed at each person’s marginal rate, be it 20% or 40%.