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.

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.

Happy male couple looking at a laptop screen together

Image source: Getty Images

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.

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

Man hanging in the balance over a log at seaside in Scotland
Investing Articles

Stock market correction: a once-in-a-decade chance to build big passive income?

Ben McPoland takes a closer look at a high-yield passive income stock from the FTSE 250 that investors have been…

Read more »

Portrait of elderly man wearing white denim shirt and glasses looking up with hand on chin. Thoughtful senior entrepreneur, studio shot against grey background.
Investing Articles

In volatile markets, could National Grid dividends be a safe haven?

National Grid offers a dividend yield well above the FTSE 100 and aims to keep growing its payout per share.…

Read more »

Finger clicking a button marked 'Buy' on a keyboard
Investing Articles

Down 25%, are Barclays shares simply too cheap to ignore?

Barclays shares have given up a chunk of their recent gains since the Middle East powder keg ignited. Should investors…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

How much would someone need in an ISA to target a £1,000 monthly second income?

Christopher Ruane explains how someone could use an empty Stocks and Shares ISA to target a four-figure monthly second income…

Read more »

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
Investing Articles

Are investors taking a big gamble chasing Rolls-Royce shares higher and higher?

With Rolls-Royce shares having fallen back from their peak, the temptation to see this as a buying opportunity must be…

Read more »

Cargo containers with European Union and British flags reflecting Brexit and restrictions in export and import
Investing Articles

Down 70%, is Fevertree Drinks a share to consider buying at 815p?

Fevertree reported its 2025 earnings today and the investors liked what they saw. So is this a share to consider…

Read more »

Thoughtful man using his phone while riding on a train and looking through the window
Investing Articles

Stock market correction: a once-in-a-decade opportunity to get rich?

Harvey Jones examines whether investors should take advantage of the current stock market correction to buy bargain-priced FTSE 100 shares.

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

Down 15% and a yield of 7.9%! Is this REIT dividend champion now irresistible?

This real estate investment trust (REIT) has one of the highest dividend yields on the London Stock Market. Royston Wild…

Read more »