The idea of becoming an ISA millionaire might sound extraordinary. Yet for thousands of UK investors it’s simply the result of two things: starting early and appropriately investing consistently.
In fact, the number of ISA millionaires has grown dramatically in recent years. A decade ago there were only around 500 people with ISA portfolios worth more than £1 million. Today there are more than 5,000, and that number continues to rise.
The reason isn’t secret stock-picking or taking big risks. Instead, most ISA millionaires have followed a simple formula. Invest regularly, use their allowance every year, and give their money time to grow.
Why ISA millionaires are multiplying
ISAs are one of the most powerful tax-efficient investment tools available to UK savers.
Money held within an ISA grows free from income tax, dividend tax and capital gains tax. Over long periods, that tax-free compounding can potentially make a significant difference to how quickly wealth grows.
Many ISA millionaires have also invested for decades. Some even began with Personal Equity Plans (PEPs), the predecessor to ISAs, before they were introduced in 1999.
They also tend to hold a higher proportion of investments rather than cash. Research suggests ISA millionaires typically hold around 80% in equities, compared with closer to 60% for the average investor. That greater exposure to long-term growth assets could significantly boost the power of compounding.
The power of time
Time is the real secret behind most ISA millionaires.
For example, investing £20,000 each year, the current ISA allowance, and achieving an average annual return of 6% could build a £1 million ISA in around 24 years.
It is also important to be aware that how much you can save into your cash ISA each year will be cut from £20,000 to £12,000 from April 2027, although those over the age of 65 will be exempted from the limit and will still be able to put £20,000 in cash ISAs.
The key is consistency and patience. Starting early allows compounding to work its magic.
A quick reminder before the tax year ends
Each tax year you can invest up to £20,000 into ISAs, but any unused allowance expires at the end of the tax year and cannot be carried forward.
If you haven’t yet used this year’s allowance, now may be a good time to review your investments and consider whether topping up your ISA could help support your long-term financial goals.
How investors build a £1 million ISA
Becoming an ISA millionaire rarely happens through luck. Instead, it’s usually the result of a four simple habits.
- Use your allowance regularly
The annual ISA allowance has been £20,000 for several years. Making the most of it each year allows your investments more opportunity to grow tax efficiently. - Invest with a long-term mindset
Cash ISAs offer certainty, but long-term investors often turn to stocks and shares ISAs for greater growth potential. - Diversify your investments
Funds and investment trusts can spread your money across many companies and sectors, helping reduce the impact of any single investment performing poorly. - Start early and stay invested
The earlier you begin investing, the longer compounding can work in your favour. Consistency often matters far more than trying to perfectly time markets.
A growing club
ISA millionaires aren’t financial prodigies. They are simply investors who used the rules to their advantage, investing regularly, staying patient, and letting time do the heavy lifting.
With the end of the tax year approaching, it may be worth asking whether you are making the most of your ISA allowance.
If you would like help reviewing your ISA strategy or understanding how tax-efficient investing could support your long-term financial plans, our team would be happy to help you explore your options.
Where the UK’s ISA millionaires are investing their money
Number of ISA millionaires hits record high – how you could become one | MoneyWeek
Cash ISA annual allowance to fall to £12,000 – depending on your age.
This article is intended for general guidance only and is based on the opinion of Continuum it does not constitute financial advice. Individual circumstances vary, and you should consider seeking advice from a regulated financial adviser before making any decisions about your Investment planning.
The value of an investment can go down as well as up and you may get back less than you invested. When investing Capital is at risk.
Stocks and Shares ISAs do not include the same security of capital which is afforded with a deposit account.
Investors in ISAs do not pay any personal tax on income or gains. Levels and basis of reliefs from taxation are subject to change and their value depends upon your personal circumstances.
We recommend that the investor seeks professional advice on personal taxation matters.
The Financial Conduct Authority does not regulate taxation advice.
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