Starting to invest in your fifties? The expensive errors are often mundane: investing money you need soon, concentrating your bets, overlooking charges and getting the tax wrapper wrong.
You have finally got round to investing beyond your workplace pension. Then a colleague mentions a share that has doubled, the market drops on Tuesday and your new account suddenly feels less like a plan than a test of nerve.
You do not need to predict the next big winner. You need to avoid the ordinary mistakes that can turn a sensible long-term decision into an expensive one. Here are five worth checking before you press ‘buy’.
First mistake: investing the money earmarked for the kitchen, the car or the gap between leaving work and drawing a pension. Shares can fall just when you need to pay the bill. Selling at that point turns a temporary fall into a permanent loss.
MoneyHelper suggests thinking of investing as a longer-term decision, generally for money you can leave alone for more than five years. It also recommends dealing with priority debts and keeping accessible emergency savings before investing. That is not an argument for leaving every spare pound in cash. It is an argument for giving each pound a job.
Suppose you expect to spend £12,000 replacing a roof in two years. Putting it into shares means accepting that it might be worth less than £12,000 when the roofer wants paying. By contrast, £500 a month set aside for a goal ten years away adds up to £60,000 in contributions before any investment growth or loss. The time available to ride out falls is different.
Retirement complicates this. You might need some of your pension soon but leave the rest invested for years. MoneyHelper notes that taking income while markets are down can mean selling more investments to raise the same amount of cash. Think about when you will need each portion of the money, not simply the date you hope to stop working.
Second mistake: mistaking a familiar name for a safe investment. You might know your employer, use a particular supermarket every week or admire a technology company’s products. None of that tells you what its shares will do next.
Imagine £40,000 invested in one company. A 25% fall takes £10,000 off its value. If the same company also pays your salary, a bad year for the business could hit your job and your investments together. That is rather more loyalty than most employers would show you.
The FCA explains that spreading money across companies, sectors and types of investment reduces your dependence on any one of them. Funds can do some of that spreading, though a fund focused on one sector or country can still be concentrated. Check what is inside your existing pension as well as any new investments: owning several accounts does not necessarily mean owning different things.
Diversification cannot prevent losses. It can, however, stop a single disappointing company from being the whole story.
Your biggest investing risk may not be picking the wrong winner. It may be giving one decision too much power over your future.
Third mistake: checking the share price but not the bill. Investing can involve a platform charge, an ongoing fund charge, dealing fees and, in some cases, advice or exit charges. MoneyHelper points out that these costs reduce what you keep, especially over longer periods.
Use a plain illustration. A 1% annual charge on £50,000 is £500 for that year, assuming the balance stays at £50,000. A 0.5% charge on the same balance is £250. The £250 difference is not a prediction of future savings: balances and charges can change. It does show why a small-looking percentage deserves five minutes with a calculator.
Trading frequently brings its own friction. If a dealing fee were £6, buying £100 of shares would cost 6% of the purchase before the share price moved. That is an illustrative fee, not a market-wide price. Read the provider’s full charges and the investment’s key information, then compare the total cost for the amount you expect to hold and how often you expect to trade. The cheapest option is not automatically the right one, but an unexplained charge is not a charming eccentricity.
Fourth mistake: treating a falling account balance as an instruction to sell. Markets move; your original reason for investing may not have changed. MoneyHelper warns that switching investments after a fall can lock in losses and leave you out of a later recovery.
The arithmetic is less forgiving than it looks. A £10,000 holding that falls 20% is worth £8,000. It then needs to rise 25% to get back to £10,000. Neither move says what will happen next. It simply shows why selling in a panic and trying to buy back at exactly the right moment is a demanding hobby.
That does not mean you should never sell. Your spending date, ability to absorb losses or understanding of an investment may have changed. Set a time to review those questions rather than letting a dramatic headline choose for you. If you plan to draw from a pension, check whether its investment approach still fits how you intend to take the money. A default fund may be adjusting its risk around an expected retirement date that no longer matches your plans.
Fifth mistake: getting the account structure right too late, or trusting the wrong person to set it up. In the 2026–27 tax year, you can pay up to £20,000 across your ISAs. Income and capital gains from investments held in an ISA are free of UK tax. Outside an ISA, the dividend allowance is £500 and the Capital Gains Tax annual exempt amount is £3,000 for 2026–27. Whether you owe tax depends on your circumstances; an ISA does not protect you from investment losses.
The ISA rules apply across the UK. Scottish income tax bands differ from those in the rest of the UK, but that does not change the ISA allowance. From 6 April 2027, people under 65 will be limited to paying £12,000 a year into cash ISAs, while the overall £20,000 ISA limit remains. That is a cash ISA change, not a reason to put short-term savings into shares.
Already have an ISA you want to move? Ask the new provider to arrange an ISA transfer. Withdrawing the money yourself can lose its existing tax-free status; paying it back may count against your annual allowance. Check transfer charges and whether investments would have to be sold during the move.
Finally, an ISA label is not proof that the person selling an investment is legitimate. Use the FCA Firm Checker, check that the firm has permission for the service offered and compare its contact details with those on the FCA’s records. Fraudsters can impersonate authorised firms. If a pitch promises easy returns or pushes you to act today, your best move may be to do nothing today.
For a decision involving a sizeable pension, MoneyHelper offers guidance, and Pension Wise offers free appointments about defined contribution pension options for eligible people aged 50 and over. An FCA-regulated financial adviser can give recommendations based on your own circumstances. Neither a colleague’s hot tip nor this article can do that.
Avoid investing money you need soon, relying on one company, overlooking fees, selling solely because markets fall and missing the ISA rules. Check what you already own, what it costs and when you will need the money. If retirement income is at stake, get guidance or regulated advice before making a decision you cannot easily undo.
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