More than half of Britons are unable to explain the difference between a cash Isa and a stocks and shares Isa, a new Zopa Bank survey suggests.
Nearly seven in 10 people aged 25 to 34 said they did not grasp the difference between a cash Isa and a stocks and shares Isa, while 65 per cent of Generation Z respondents admitted the same.
Across all age groups questioned, half said complicated financial jargon put them off investing and doing more with their money.
The figure rose to 56 per cent among 25 to 34-year-olds, suggesting that the future generation of British retail investors lacks clarity and confidence, not motivation.
Meanwhile, 68 per cent of respondents said they wanted to actively grow their finances and make their money work harder for them, but were deterred by jargon, Zopa said.
With so much technical jargon sloshing about, an ‘investment paradox’ has emerged, according to the challenger banks, which launched its new investments offering in November 2025.
Many people want to get into investing but lack the confidence or know-how to do so, the survey of 2,000 showed.
Challenging: More than half of people surveyed by Zopa Bank said they were unable to explain the difference between a cash Isa and a stocks and shares Isa
Seemingly endless government policy and tax changes further complicate the picture for ordinary people and make it hard to keep tabs on what all the rules are when it comes to investing and saving.
Nearly two in five people surveyed said investment terms like ‘diversification’ and ‘volatility’ left them feeling confused. More than a quarter also said such terms left them feeling anxious and intimidated.
Only 15 per cent of respondents said they were content with their financial situation.
Merve Ferrero, chief strategy officer at Zopa, said: ‘For too long, Britons have kept billions in cash – not due to a lack of interest or ambition, but because complexity and technical jargon leave them unsure where to start.
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‘The biggest barrier remains language and confidence – especially in the Isa market, where retail investors often find the terminology mind-boggling and confusing.’
Kate Dwyer, head of UK and Northern Europe Distribution at Invesco, said: ‘One of the most powerful things any of us can do for our future selves is simply to start investing.
‘Time in the market is one of the greatest advantages available to everyday investors.
‘By investing early, even with modest amounts, someone can potentially see their money grow significantly more than those who wait until they have all the answers – purely because of the magic of compounding: returns building on returns, year after year.
‘An Isa is a brilliant, tax-efficient way to start, and the earlier you begin, the harder your money works for you.’
The 15 most baffling investment terms
Zopa’s findings pinpointed the 15 investment terms people find the most challenging to grasp.
Seventy-one per cent of people said they did not know what an index fund was.
Index funds are a cheap and easy way to invest that have made some investors a lot of money in recent years.
Rather than having a fund manager who picks shares or other assets to try to beat the market, an index tracker fund simply follows it.
Options range from tracking a very broad index, such as the global stock market, to a narrower individual country’s stock market, such as the UK’s FTSE 100, or a basket of other investments.
| Term | % who don’t understand it |
|---|---|
| Index funds | 71% |
| Asset allocation | 68% |
| Diversification | 61% |
| Equities | 60% |
| Volatility | 57% |
| Compound interest | 55% |
| Capital gains | 55% |
| Bonds | 54% |
| Risk tolerance | 54% |
| Stocks & Shares ISA | 49% |
| ISA allowance | 43% |
| Fixed Rate ISA | 39% |
| Easy Access ISA | 37% |
| Personal Savings Allowance | 32% |
| Interest rate | 26% |
The second term respondents were most likely to misunderstand was asset allocation. This refers to how you choose to divide your savings and investment pots.
You might allocate some of your cash to a cash Isa, but have another pot stashed away in a stocks and shares Isa.
More than six in ten respondents said they did not understand what diversification meant in the context of investing.
Vanguard explains diversification neatly: ‘You’ve heard the expression, “Don’t put all your eggs in one basket.”
‘The reason is that if the basket falls, you could lose everything in one fell swoop.
‘But if your eggs are in multiple baskets, you have a much better chance of getting home safely with enough eggs to make that omelette. The same principle applies to your investment portfolio.’
Many respondents also admitted they did not understand what compound interest is or how it works, even though it can be key to generating wealth over time.
More than a quarter of respondents said they did not understand what interest rates were and how they may affect their finances.
The Bank of of England’s Monetary Policy Committee sets interest rates to try to keep consumer price inflation at the Bank and Government’s 2 per cent target.
The current base rate is 3.75 per cent. Interest rate have a significant impact on mortgages and the amount of interest people can make on their savings.
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