The Stocks and Shares ISA allows Britons to contribute up to £20,000 a year to a tax-free investment portfolio. When it comes to wealth creation in the UK, there is nothing like it.

To generate £1,000 of passive income each month (£12,000 per year) from a Stocks and Shares ISA, an investor would need a portfolio of around £240,000, which would give a 5% annual rate of return.

It’s a significant sum, but the beauty of compounding means it doesn’t have to be built overnight.

For example, investing £400 a month in a diversified ISA with an average return of 8% a year could grow to around £235,000 after 20 years.

Every year the returns start to pay off on their own – it compounds in action. Early contributions will have to grow over decades, while later contributions will benefit from an increasingly larger base.

The key is consistency and time in the market, not timing. Even modest, regular investments can turn into a significant passive income stream, especially when protected from tax within an ISA.

Please note that tax treatment depends on each client’s individual situation and may change in the future. The content of this article is for informational purposes only. It is not intended to be and does not constitute any form of tax advice. Readers are responsible for conducting their own due diligence and obtaining professional advice before making any investment decisions.

Where to invest?

OK, so we’ve looked at how this can be achieved in theory, but the next part is about what to do to achieve it. After opening an ISA with a brokerage, investors must choose which shares to buy with their hard-earned money.

The options – depending on the broker – are usually huge. There’s everything from funds and mutual funds to stocks and bonds.

Funds and unit trusts pool money from many investors to buy a diversified set of assets, managed by professionals, with the goal of generating consistent returns.

They are often seen as an easier way to spread risk without picking individual stocks. On the other hand, stocks represent ownership of specific companies – higher risk, but with the potential for higher long-term returns.

Bonds are essentially loans to governments or corporations that pay a fixed interest rate, offering stability and predictable income.

Personally, as a more experienced investor, my portfolio is biased towards a wide range of stocks. My data-driven approach helps me achieve returns that typically far exceed those achieved by index-tracking funds.

A current favorite

My only investment in October was London Stock Exchange Group (LSE:LSEG). According to analyst consensus, London Stock Exchange Group is currently perceived as the most undervalued company on the market FTSE100.

Forecasts suggest a 42% discount to fair value. However, such estimates should be approached with caution because analysts’ information may vary in quality. So why is he so underrated?

London Stock Exchange Group has a wide economic moat and operates a high-margin business, particularly in data and analytics. It also boasts double-digit earnings growth, trading at just over 20 times futures earnings.

However, no product is perfect. The risk remains. Competition for data and analytics is fierce, and moving away from legacy products can reduce recurring revenue.

However, for long-term investors, this risk may be offset by the company’s diversified, high-margin operations. I definitely think this is a stock worth considering.