How I plan to double my Stocks and Shares ISA in 5 years

It’s an ambitious target but Paul Summers hopes to double the money in his Stocks and Shares ISA by 2026. Here’s what he plans to do.

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The goal of doubling the value of a Stocks and Shares ISA in a relatively short period of time sounds fanciful but that’s exactly the target I’ve set myself between now and 2026. Today, I’ll explain how I hope to meet this challenge. First, a quick bit of (simple) maths.

Doubling my ISA: what will it take?

To double the value of my portfolio, I need to achieve an annualised return of around 15%. In other words, I need my capital to grow 15% in 2021, another 15% in 2022, and so on. This is how things would look if I used the nominal sum of £1,000.

Year Sum at beginning of year Interest Sum at end of year 
1 1,000 15% 1,150
2 1,150 15% 1,323
3 1,323 15% 1,521
4 1,521 15% 1,749
5 1749 15% 2,011

Compound interest really is a wonderful thing. And this doesn’t include the impact of any reinvested dividends!

So, how do I hit this target?

Clearly, being invested in the best stocks helps. But what makes a company better than others? Everyone will have an idea about this.

A ‘meme stock’ investor would say that AMC Entertainment and GameStop would qualify. I respectfully disagree. Their share prices have certainly ‘popped’ in 2021 but have since flagged. They’re best left to traders, in my opinion. 

Personally, I don’t think I need to take on such risk to get a 15% annualised return. For me, the best ISA stocks are those that are leaders in niche markets, boast fantastic brands, have strong growth potential, and/or generate great returns on the money they invest. I think I have several in my portfolio already. These include kettle appliance maker Strix, equipment manufacturer Somero Enterprises, and online behemoth Boohoo

But let’s take a step back here. The fact that something is achievable does not mean it will happen, of course. Let’s briefly look at what things could stop me from achieving my goal.

What could go wrong

Unfortunately, there’s no guarantee my ISA stocks will perform. Last week alone showed just how unforgiving other investors can be with the share prices of Best of the Best and Avon Protection being pummelled. Both have previously scored highly on the things I usually look for.

Even if the companies I own do very well, they could still be held back by general market jitters. These days, investors are getting increasingly worried about rising inflation, for example. And even if this does prove ‘transitory’, there will always be another potential setback waiting in the wings to knock confidence. 

How I can improve my chances

Aside from hoping my stock-picking is on form, there are four other things I think I can do. 

1) Keep investing. This includes periods in which markets head south. It sounds simple but it’s harder to do in practice.

2) Go small. Smaller companies have the ability to grow at rates larger companies simply can’t. This can often lead to a huge uplift in share prices. 

2) Use up my ISA allowance. As well as continuing to invest, it would also be a good idea to use my £20,000 ISA allowance in full. The more money I put to work, the greater the potential impact of compounding.

3) Avoid frothy markets. A final, debatable point is that it might make sense to avoid markets (and companies) where valuations are looking stretched. Having more than doubled over the last year, the US market looks a little too hot to me right now. 

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.

Paul Summers owns shares in Strix, Somero Enterprises and boohoo group. The Motley Fool UK has recommended Avon Protection, Somero Enterprises, Inc., and boohoo group. 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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