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How much is £7,620 saved in a Cash ISA a decade ago worth today?

Cash ISA savers have received an average of 4% over the last decade, but Harvey Jones says the average Stocks and Shares ISA has totally smashed that.

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Two female adult friends walking through the city streets at Christmas. They are talking and smiling as they do some Christmas shopping.

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Every UK adult can tuck away up to £20,000 in a Cash ISA this financial year, if they have it. That changes from next April, when the annual subscription limit for the under-65s is cut to £12,000. Many savers are keen to max out this year’s Cash ISA allowance but is that really the right thing to do?

The Cash ISA is the ideal home for short-term savings. But anybody looking to build long-term wealth is likely to get a far superior return from a Stocks and Shares ISA. Equities are more volatile in the short term, but history shows they easily outperform cash over time. The performance gap may surprise you.

Can my Cash ISA keep up with the stock market?

Research body Investing Insiders calculates that over the last decade, the average Cash ISA returned 4% a year. By contrast, the average Stocks and Shares ISA returned 9.5% a year, with dividends reinvested. Let’s see what that means in practice.

Ten years ago in 2016, the annual ISA contribution limit was £15,240. Let’s say somebody put half of that — £7,620 — in cash and the other half in shares. Here’s what they’d have today:

  • Cash ISA value: £11,279
  • Stocks and Shares ISA value: £18,884

Equities would have delivered an extra £7,605, but the eye-dropping difference comes over much longer periods. Let’s see what happens if they leave their money for 30 years:

  • Cash ISA value: £24,715
  • Stocks and Shares ISA value: £115,979

The stock market would have delivered a stunning £91,264 more. That’s even bigger than I expected. Which shows the long-term power of compound investing.

Right now, a popular way to build a Stocks and Shares ISA is to invest in a spread of FTSE 100 shares offering both dividend income and growth. 

What does this FTSE 100 stock have to offer?

One blue-chip stock that’s delivered both in spades is insurer and asset manager Aviva (LSE: AV). Over the last five years, its shares have climbed 55%. Typically, it’s yielded 6% a year on top, through regular dividends. That lifts the total return to around 90%, with dividends reinvested.

Aviva doesn’t just pay a high income, but one that rises regularly. Over the last five years, it’s increased dividends at an average rate of 13.35% a year. They’ve been racing ahead of inflation in real terms. Dividends aren’t guaranteed though.

Stock markets have been bumpy lately, and Aviva’s shares have dipped 9% over the last six months. This may be an opportunity to get in at a reduced price. The forward price-to-earnings ratio is a modest 12.1, which is reasonable value. As always with shares there are risks, as investors await events in Iran. Aviva also has to battle for business in a competitive market, and the UK economy is struggling.

Yet I believe this is a well-run company that should benefit as the population gets older and needs more pension and retirement products. I think it’s a compelling long-term opportunity for Stocks and Shares ISA investors to think about. And there are plenty more great value FTSE 100 stocks I’ll consider today.

Harvey Jones has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

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