I'm looking for some mortgage advice. Apologies if my question has already been covered on this group. A quick trawl revealed similar questions but not exactly mine, and, in any case, the advice could change over time.
I'm considering buying the house next door to live in and renting out mine (mortgage already paid off). The next door house is bigger than mine and worth around £100k more. I would plan to take out a mortgage of around 80% of the value of the new house, which will be about 5x my salary. I'm considering an interest only mortgage (to keep the monthly payment sensible). I reckon the rental income from my existing house would cover about 80% of the monthly mortgage payment. I'm very confident the house will rent easily as it's an attractive house in sought-after area.
The above plan would allow me to live in a bigger house, with some control over who my neighbour is, with an affordable monthly outgoing, and I'd benefit from the investment in two houses. I'd plan to sell off the rented house in 15 years when I retire to pay back the mortgage capital (and probably be able to pay back a fair bit of the capital in the meantime).
I can't see any obvious downsides. If interest rates were to rise hugely and/or I can't rent for some reason, I would simply sell it.
Questions: What are my best options for borrowing the money? How can I best reduce the tax liability?
Any advice gratefully received.
Thanks, Reg