For the 2018 to 2019 tax year, you can only claim 50% of the cost of getting a loan, or alternative
finance to buy a residential property that you let, and 50% of any interest on such a loan or
alternative finance payments.
To show this on SimpleTax, click on on the Partnership Page
Use the Pencil Icon to edit INCOME FROM PROPERTY BOXES 36-41.1
50% of the finance costs should go in the Residential Finance Costs box 41.1