Thank you for your question.
You should prepare your rental income statements for all years since the change to mortgge interest relief and see overall impact on tax.
Mortgage interest as allowable expense against rental income after change was
Tax year 2017-18 75% as expense and 25% available as basic rate deduction
Tax year 2018-19 50% as expense and 50% available as basic rate deduction
Tax year 2019-20 25% as expense and 75% available as basic rate deduction
Tax year 2020-21 100% available as basic rate deduction
If you are a basic rate taxpayer then the change has no impact on your tax payable on rental income.
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