Could I use my £20k ISA allowance today to be a millionaire in 30 years?

Our writer thinks using his ISA contribution allowance fully before today’s deadline could realistically help him become a millionaire in time. Here’s how.

| More on:

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.

2024 year number handwritten on a sandy beach at sunrise

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.

Every year, the deadline for contributions to an ISA comes around. Every year, some people put money into their ISAs while others miss the opportunity. Life moves forward. But what if I used my £20k ISA allowance before the deadline at midnight tonight, even if I had no immediate plans as to how to invest the money?

I think by doing that I could end up being a millionaire 30 years from now. Here’s how.

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.

Money now, ideas later

The annual deadline is for contributions. I could wait until I decide how to invest the money before putting any in, but by then, this tax year’s ISA contribution deadline could have passed forever.

So even if I did not yet know how I planned to invest it, I would choose the Stocks and Shares ISA that suited my own financial circumstances best and then put my £20k into it before that midnight deadline.

Once that was done, I could decide at my own leisure how best to invest it.

Having a target

But how could I hope to turn a £20k contribution today into a million-pound nest egg 30 years from now?

The answer – or at least one answer – lies in building success upon success. By ploughing returns into building up a bigger nest egg, there is a bigger base for future returns.

In investment terms, this is known as compounding – and it can be a very powerful force multiplier.

As an example, imagine I could compound my £20,000 at an annual rate of 13.2%. After 30 years, one year’s ISA allowance today would have turned into a share portfolio worth north of a million pounds!

Getting the gain

But is 13.2% achievable? No FTSE 100 shares offer that yield. Some others do but can be risky. Diversified Energy currently yields 28%, but last month announced its dividend would be cut by two thirds.

The thing is though, compound annual return does not have to come from dividends alone (or at all). Share price growth (or decline) is also a factor.

A 13.8% annual gain is difficult, but I think it is achievable. Using my £20k ISA allowance, I could spread my money equally over five to 10 different shares. That would give me the benefit of diversification. But I would still need to choose some real winners!

The Warren Buffett way

Over much longer —  the 58 years up to 2023, specifically – the per-share market value of Warren Buffett’s Berkshire Hathaway compounded at 19.8% annually.

Buffett achieved that by investing in companies like Coca-Cola (NYSE: KO).

Why? Think about the attributes of the soft drinks maker. It has a large addressable market likely to endure. It can profit from that, thanks to strong competitive advantages such as its unique assets including iconic brands and proprietary formulas.

But Buffett has not bought new Coke shares since the 1990s. The business faces risks such as rising health concerns leading to shifting customer tastes. When Buffett bought he pounced on what he saw as an attractive valuation, and has held for the long term.

If I can find great businesses selling at attractive valuations, I believe a long-term approach could help me transform this year’s ISA allowance into a million pound portfolio!

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.

C Ruane 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.

More on Investing Articles

Businesswoman analyses profitability of working company with digital virtual screen
Investing Articles

After a solid set of results, is it time to buy this FTSE 100 dividend giant?

I've been looking at FTSE 100 tobacco giant Imperial Brands after it posted impressive full-year results yesterday.

Read more »

Investing Articles

It’s big! It’s yellow! But is this FTSE 250 stock a safe place to store my capital?

After viewing its half-year trading update yesterday, this FTSE 250 storage giant left our writer considering whether to invest in…

Read more »

Investing Articles

Down 28%! What’s going on with GSK’s share price?

The GSK share price has tumbled recently on a number of factors, but I think its fundamentals look strong, leaving…

Read more »

A pastel colored growing graph with rising rocket.
Investing Articles

This superstar FTSE growth stock is up 65% and there still looks huge value left in it to me

This FTSE 100 finance stock has soared this year but still looks packed with value to me, supported by strong…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

Could divestitures unlock hidden value in shares of this FTSE 100 company?

Stephen Wright thinks value investors looking for shares to buy should consider a FTSE 100 stock with a plan to…

Read more »

Engineer Project Manager Talks With Scientist working on Computer
Investing Articles

Down 65% in 2024, but can the Avacta (AVCT) share price ever recover?

Some investors have done well in the life sciences sector, so does AVCT have potential now the share price has…

Read more »

Young woman holding up three fingers
Investing Articles

Just released: our 3 top income-focused stocks to buy before December [PREMIUM PICKS]

Our goal here is to highlight some of our past recommendations that we think are of particular interest today, due…

Read more »

Young female business analyst looking at a graph chart while working from home
Investing Articles

Up 125% in 5 years, the BAE share price has beaten Rolls-Royce. Which is better?

Both the BAE and Rolls-Royce share prices have been having a storming time. Here's how they stack up against each…

Read more »