Eight mistakes immigrants often make with money in the UK: Self Assessment penalties, income in Turkey, tax codes, workplace pensions, HMRC scams and bank protection
Published: Last checked: October 20264 min read
Short answer
Points that cause problems according to official pages: filing Self Assessment after 31 January (£100 late), not declaring rental or pension income from Turkey, never checking your tax code, opting out of a workplace pension unaware, HMRC scams and the £120,000 bank protection limit.
In short
- This post is general information and does not assess anyone's personal situation. It makes no statistical claim about "the most common" mistakes: it collects the points that, according to official pages, cause problems when missed. It is based on official pages as they were on 18 October 2026 and covers England.
- This is not financial or tax advice. Each point rests on a GOV.UK, HMRC, FSCS or FCA page.
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Official sources
This answer is based on the pages below. Check the source yourself before you decide.
- GOV.UK: Self Assessment tax returns, deadlines
- GOV.UK: Self Assessment tax returns, penalties
- GOV.UK: Tax on foreign income
- GOV.UK: Workplace pensions, joining and contributions
- GOV.UK: Identify tax scam phone calls, emails and text messages
- FSCS: Banks, building societies and credit unions
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