Turning a small ISA into a £200k portfolio (in less than 10 years)

With a regular savings plan and a smart investment strategy, it’s possible to build up significant wealth within an ISA, says Edward Sheldon.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

Happy male couple looking at a laptop screen together

Image source: Getty Images

When investing, your capital is at risk. The value of your investments can go down as well as up and you may get back less than you put in.

Read More

The content of this article is provided for information purposes only and is not intended to be, nor does it constitute, any form of personal advice. Investments in a currency other than sterling are exposed to currency exchange risk. Currency exchange rates are constantly changing, which may affect the value of the investment in sterling terms. You could lose money in sterling even if the stock price rises in the currency of origin. Stocks listed on overseas exchanges may be subject to additional dealing and exchange rate charges, and may have other tax implications, and may not provide the same, or any, regulatory protection as in the UK.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Investing within an ISA is a very effective way to create wealth. With these tax-efficient accounts, it’s possible to build up a substantial amount of capital over time, even if one is starting with a relatively low amount of savings.

Here, I’m going to explain how I’d aim to build a £200k portfolio in under 10 years if I was just beginning my ISA journey today. These are the moves I’d make in an effort to go from zero to hero.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

Choosing the right ISA

So, the first thing I’d do is open a Stocks and Shares ISA with a reputable provider such as Hargreaves Lansdown, AJ Bell, or Interactive Investor.

The reason I’d select this type of ISA is that it’s a far more powerful investment vehicle than the Cash version.

With a Stocks and Shares ISA, I’d have access to investments that could really turbocharge my wealth over the long run such as stocks, funds, and exchange-traded funds (ETFs).

Regular savings

Once my ISA was open, I’d set up a regular savings plan.

Here, I’d crunch the numbers to work out how much I’d need to save per month to achieve my goal, factoring in my potential investment returns.

As an example, I calculate that if I was able to achieve a return of 8.5% per year on my money (more on this below), I’d need to save around £1,200 per month into my ISA to hit £200k in less than 10 years.

Once I knew how much I wanted to save every month, I’d pay this amount into my ISA as soon as I was paid (paying yourself first is one of the most effective ways to save money).

Investing to build wealth

As for how I’d aim to generate a return of 8.5% per year on my savings, I’d invest in the stock market.

Over the long term, the stock market has produced returns of around 7-10% per year. So, I reckon an annualised return of 8.5% is achievable over a decade.

The thing is though, to achieve that kind of return, I’d have to build a decent portfolio.

A handful of stocks isn’t going to cut it. That’s because, if one or two of these stocks underperformed, my overall returns could be significantly lower than 8.5% per year.

So, I’d do my research – with the help of experts like The Motley Fool – and set about building a diversified stock portfolio (at least 15 stocks) that includes a mix of ‘blue-chip’ UK businesses, smaller UK growth companies, and well-known, dominant businesses that are listed overseas.

I’d aim to invest in world-class companies such as London Stock Exchange, Diageo, Rightmove, and Apple, which all have amazing long-term track records when it comes to generating wealth for investors.

Of course, there’s no guarantee that I’d hit the £200k mark in under 10 years with this approach to investing. The stock market can be volatile at times.

However, history shows that stocks tend to outperform most other assets over the long run.

So, I’d be willing to give this wealth-building strategy a shot.

Should you invest, the value of your investment may rise or fall and your capital is at risk. Before investing, your individual circumstances should be assessed. Consider taking independent financial advice.

Edward Sheldon has positions in Apple, Diageo Plc, Hargreaves Lansdown Plc, London Stock Exchange Group Plc, and Rightmove Plc. The Motley Fool UK has recommended Apple, Diageo Plc, Hargreaves Lansdown Plc, and Rightmove Plc. 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.

More on Investing Articles

British Pennies on a Pound Note
Investing Articles

1 near-penny stock I’m buying for the last time at 19p

Our writer explains why a penny stock he bought a couple of years ago has taken a big dip since…

Read more »

Investing Articles

3 ETFs to consider buying for a 16% average annual return!

Searching for double-digit annual returns? These top exchange-traded funds (ETFs) could help investors build substantial long-term wealth.

Read more »

Middle-aged black male working at home desk
Investing Articles

2 top ETFs I’m considering buying for my SIPP in 2025!

Exchange-traded funds (ETFs) can be a great way to spread risk AND target market-beating returns. Here's a couple I have…

Read more »

The flag of the United States of America flying in front of the Capitol building
Investing Articles

3 top S&P 500 growth shares to consider buying for a Stocks and Shares ISA in 2025

Edward Sheldon has picked out three S&P 500 stocks that he believes will provide attractive returns for investors in the…

Read more »

Growth Shares

Can the red hot Scottish Mortgage share price smash the FTSE 100 again in 2025?

The Scottish Mortgage share price moved substantially higher in 2024. Edward Sheldon expects further gains next year and in the…

Read more »

Inflation in newspapers
Investing Articles

2 inflation-resistant growth stocks to consider buying in 2025

Rising prices are back on the macroeconomic radar, meaning growth prospects are even more important for investors looking for stocks…

Read more »

Investing Articles

Why I’ll be avoiding BT shares like the plague in 2025

BT shares are currently around 23% below the average analyst price target for the stock. But Stephen Wright doesn’t see…

Read more »

Warren Buffett at a Berkshire Hathaway AGM
Investing Articles

5 Warren Buffett investing moves I’ll make in 2025

I’m planning to channel Warren Buffett in 2025. I won’t necessarily buy the same stocks as him, but I’ll track…

Read more »