Deposit loan also deductable?

Hello. When I originally purchased my Buy to let property I remortgaged my home, increasing the amount borrowed, for the deposit. Does this mean a part of the interest on that mortgage is also tax deductable as a financial cost? Would I need to prove exactly what percentage of the interest covers the deposit ? Thank you.

Hi matt F,
Yes. You would need to work out what proportion of the interest applies to the rental property.
Thank you.