Hi, On the paper SA100 (tax return) untaxed UK interest is declared in box 2 of page TR3. Box 3 on the same page is for untaxed foreign interest up to £2,000. If your foreign interest is taxed, then it should be declared in SA106 (Foreign) on page F2. There is a list of countries and their 3 character letter code on the Sa106 notes. All entries on the tax return should be in whole pounds only. You can round up or down in your favour when doing this:
Foreign (2024)
and
Foreign notes (2023-24)
Thank you.