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ETFs · Index funds · Workplace funds · Stocks · Mana Credit · Compare halal products ↗ · Terms · PrivacySix specific mistakes: why people make them, and exactly what to do instead. The ISA wrapper one alone is worth thousands.
Most investing mistakes aren't about picking wrong stocks. They're about behaviour: waiting, panicking, ignoring wrappers, misunderstanding what you own. Here's the full list of what actually costs people money.
One foundational rule sits underneath all of them: only invest money you won't need for at least 5 years. Markets rise and fall in the short term, so a 5-year-plus horizon gives your investments time to ride out the dips and compound. Money you'll need sooner belongs in easy-access savings, not the stock market. Get that right first, and the mistakes below matter far less.
Why people do it: "The market looks expensive." "There's a lot of uncertainty right now." "I'll wait until things settle down."
Why it's wrong: There is no perfect time. The market has been at "record highs" for most of its history. Every period in history looked uncertain to people living through it. Waiting costs you compound growth. Time in the market beats timing the market.
What to do instead: Start now with whatever you can. Increase the amount as you earn more. Don't wait.
Why people do it: It feels like cutting losses. Stopping the bleeding. Being prudent.
Why it's wrong: Selling turns a paper loss into a real loss. Markets recover. Every major crash, from 2008 to 2020 to the dot-com bust, was followed by new highs. Investors who held recovered. Investors who sold locked in their losses.
What to do instead: Set a rule before you start: "I will not sell when the market drops by 20%." Write it down. Stick to it.
Why people do it: Curiosity. Anxiety. The app is right there.
Why it's wrong: Daily checking is associated with worse outcomes because it makes you feel every fluctuation. Noise looks like signal. You make emotional decisions on short-term movement in a long-term investment.
What to do instead: Check quarterly. Set a recurring calendar reminder for 3 months from now. Close the app.
Why people do it: They don't know about it, or think it's complicated.
Why it's wrong: Capital gains tax is 18–24% on profits from investments held outside an ISA. If your ISWD holding grows by £10,000, you could owe £1,800–£2,400 in tax. Inside an ISA, that's £0.
What to do instead: Always open a Stocks & Shares ISA first. The annual allowance is £20,000. Almost no beginner investor hits that. This is the single highest-impact thing you can do with no extra cost.
Why people do it: "Diversification means owning lots of different things, right?"
Why it's wrong: ISWD already holds 400+ companies across 23 countries. Buying five different ETFs on top of that is not diversification, it's complication. More holdings = more decisions, more complexity, harder to track, no meaningful benefit.
What to do instead: One ETF for now. ISWD in an ISA on Trading 212. Add more only when you genuinely understand what you're adding and why.
Why people do it: Both appear in the same app. Both have tickers.
Why it's wrong: A single stock is a bet on one company. An ETF is ownership of hundreds. If you buy Apple stock and Apple has a bad year, your investment suffers significantly. If Apple is one of 400 holdings in ISWD, a bad year barely registers.
What to do instead: Stick to ETFs until you're confident you understand what you're doing with individual stocks. The extra risk of concentration rarely pays off.
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