Ques – On 6 April 2020, Danh purchased a freehold house which was then let out. The total amount of rent received during the tax year 2020/21 was £14,400. (2) Danh partly financed the purchase of the property with a repayment mortgage, paying mortgage interest of £10,000 during the tax year 2020/21.
SO here as per notes it says that this is deductible from maine residence however here its nil and then dudcted 10k *20% from income tax liability why ?