Nicholas Jones

Hello I am a low earner and do not exceed my tax free allowance. My only income source is usually from property rentals, however this year (FY24) I also had some income from interest (circa £2000). When entering this in to my Self Assessment (SA) it is calculating I ow tax on this interest which it shouldn't. So I must be doing something wrong with my SA. Please see below my calculations. This year my income from property was £21,497 (rent - allowable expenses). My finance costs were £12,274 generating a tax credit of (12274*0.2) £2455. Tax due on my income £21,497 I calculate as: Remove tax free allowance: 21497 - 12570 = 8927. Tax due before credit: 8927 * 0.2 = 1785. Tax due after credit: 0 Tax credit remaining: 2455 - 1755 = 700. So if we just take my property income I should pay no tax this year and have a £700 credit to be used against any additional income. Which means I should be able to make an additional £3500 (700/0.2) before any tax is due, and I made only £2000. My questions is how do I enter my remaining tax credit in to my SA? There is a tax adjustment section but the descriptions do not match what I am trying to do. Any help is greatly appreciated. Kind regards, Nicholas