not sure if your difficulty is with the software or general concept.
I'll do the general concept and someone else will fill out anything QB specific if you are not able to work it out from my answer.
The mortgage / loan on a property purchased on a buy to let for the purpose of a rental business is held as a liability at the loan amount.
The property is a non current asset of the business (assuming that this is not simply a short term let of one's primary property).
Interest apportionment of mortgage payments is expensed.
Capital apportionment of mortgage repayments reduces the loan liability.
Your finance provider should provide you with a breakdown, monthly or annualy showing a breakdown of capital and interest.
There are all sorts of complications around the exact scenario (furnished / unfurnished / mortgage type / short term vs long term let, etc) including possible eventual CGT liability.
In the short term I think that this response should serve for the specific question already posed.
kind regards,
Shaun.
p.s. do you want to introduce yourself to the forum saying which professional body you are with etc. so that we know at what level to pitch replies.
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Shaun
Responses are not meant as a substitute for professional advice. Answers are intended as outline only the advice of a qualified professional with access to all relevant information should be sought before acting on any response given.