Index Funds for Beginners: My Simple Approach to Investing
August 7, 2026
Index funds appeal to me because they remove a lot of decisions I don’t believe I’m especially good at making. I don’t know which company will be the next big winner, and I don’t want to spend every evening trying to predict it. I would rather own a broad spread of businesses and invest consistently.
I’ve built most of my wealth through businesses and property. I own about £3.5 million of property, which involves mortgages, tenants, repairs and a reasonable amount of work. My index-fund holdings were also well into six figures when I made this video, but they took very little of my time to manage.
This guide follows my video published on 7 August 2026. I’ll explain what an index fund does, why fees matter and how I think about regular investing. The figures are illustrations of compounding, not a promise that choosing a fund will make you a millionaire.
You can also watch my complete index-fund guide on YouTube.
What is an index fund?
An index is a group of investments selected according to a set of rules. An index fund aims to follow that index as closely as it can, rather than paying a manager to choose investments they think will beat it.
If you put all your money into one company, your result depends heavily on what happens to that business. You could buy several companies yourself to spread the exposure, but you would then need to decide what to buy, how much to hold and how to maintain the portfolio.
A broad index fund can do much of that work within one investment. It may hold hundreds or thousands of companies, depending on the index. You don’t need to identify the best performer in advance in order to own a small part of it.
That doesn’t make all index funds equally diversified. A fund following one industry or one country has a different exposure from a global fund. I want to understand what the index contains before assuming the word “index” means I have bought the whole world.
Why I prefer a broad global fund
At the time of the video, more than 90% of my index holdings were in the Vanguard FTSE All-World ETF. It gives exposure to companies across developed and emerging markets. I mention it to explain what I own, rather than to say everybody should copy my portfolio.
It doesn’t literally own every business everywhere. A global share fund also remains a share investment, so its value can fall significantly when equity markets struggle. It isn’t the same as holding a mixture of shares, bonds and cash.
What I like is the simplicity of backing a broad group of businesses rather than trying to guess the winning country, industry or individual stock. I accept that I don’t have a special ability to predict the next election result, geopolitical shock or change in market leadership.
I’ve made my portfolio more complicated in the past, adding investments until the simple idea was less simple. These days, I would rather have an arrangement I understand and can leave alone than a long list of overlapping funds that encourages constant tinkering.
The evidence that persuaded me to take simplicity seriously
In the video I referred to S&P Dow Jones Indices’ SPIVA research. Its year-end 2025 figures showed that roughly 79% of active US large-cap equity funds underperformed the S&P 500 that year. Over ten and fifteen years, the proportions were around 86% and 90%.
That doesn’t prove every active manager will fail or that every index is appropriate. It does make me cautious about assuming that paying for more research and activity necessarily produces a better outcome after costs.
I also mentioned Warren Buffett’s ten-year bet comparing an inexpensive S&P 500 investment with a group of hedge-fund portfolios. His 2017 shareholder letter reported a 125.8% gain for the index investment, while the five fund-of-funds selections averaged roughly 36%.
The lesson I take from those examples is about humility and costs. Professional investors have substantial resources, yet outperforming a broad market over long periods remains difficult. I don’t assume I will solve that problem by spending a few evenings looking at share charts.
Small annual fees can become a large difference
Let’s use the fee example from the video. Assume two investments both earn an average 8% a year before fees. One costs 0.2% annually, while the other costs 1.5%. For this simplified illustration, that leaves net rates of 7.8% and 6.5%.
If £500 is invested at the end of each month for thirty years, using those annual rates divided by twelve for monthly compounding, the lower-fee example finishes at approximately £716,000. The higher-fee example finishes at around £553,000.
In each case, the investor has contributed £180,000. The difference between the final balances is about £163,000. This isn’t a forecast of two actual funds; it isolates the effect of different assumed fees while holding the pre-fee return constant.
The cost isn’t only the fee deducted in a particular year. It also includes the future growth that money might otherwise have earned. That is why I care about the full cost of the investment and the platform, even when the percentage initially looks small.
Fund charges, platform fees and dealing costs can be structured differently. I would compare the total for the amount and type of investment I intend to hold, rather than choosing whichever provider advertises the smallest number on its homepage.
Choose the account as well as the investment
For an eligible UK investor, a stocks and shares ISA can be a useful starting point. The ISA is the tax wrapper; the fund held within it is the investment. They answer different questions.
The government’s ISA guidance sets out the rules. For the 2026/27 tax year, the overall annual ISA contribution allowance is £20,000, and qualifying ISA income and gains are free of UK tax. Eligibility and the limits across your accounts still matter.
You don’t need £20,000 to begin. It is a contribution ceiling, not an entry requirement. A pension may also be relevant to a retirement plan, although access restrictions and tax treatment differ. I would choose the account around the purpose and timing of the money.
I use Hargreaves Lansdown and described being happy with the platform in the video. The charges on my own arrangement were a little over £100 a year for holding six figures of ETFs. That is my experience at the time, not a current fee quotation for a new account or a claim that it is the cheapest option for everyone.
I wasn’t affiliated with the provider. Before choosing any platform, I would check its regulation, available investments and current full fee schedule for the account I actually need.
Automate an amount you can maintain
Once I’ve chosen a sensible investment, consistency becomes more useful than watching the price every day. Setting up a regular contribution shortly after payday makes investing part of the monthly routine rather than a decision I have to remake constantly.
The amount needs to matter, but it also needs to be sustainable. If one unexpected bill forces me to sell investments, I’ve probably committed money that should have remained available in cash. A long-term plan needs enough flexibility to survive ordinary life.
At £200 a month, the first year’s contributions are £2,400. Even a strong return on that amount won’t transform your finances immediately. That slow beginning is where people can become bored and start looking for a shortcut.
I think it is better to understand that stage in advance. The early progress comes mainly from your contributions. Compounding becomes more noticeable later, once there is a larger balance on which returns can be earned.
How long might £500,000 or £1 million take?
For the video illustrations, I used a 9% return assumption. To make the arithmetic consistent here, the following figures use 9% divided by twelve as a constant monthly rate, month-end contributions, no starting balance and no separate allowance for tax or fees.
At £200 a month, the calculation reaches £500,000 in about thirty-three years and four months, and £1 million in about forty years and nine months. At £500 a month, it reaches £500,000 in about twenty-three years and eleven months, and £1 million in about thirty-one years.
At £1,000 a month, the respective times are around seventeen years and five months, and twenty-three years and eleven months. At £1,500 a month, they fall to about fourteen years and twenty years. These are recalculated illustrations; rounding and the compounding convention can change the precise timing from the spoken estimates.
A real investment won’t deliver that steady monthly return. Some years can be negative, and a lower long-term return lengthens the journey. Fees reduce the balance, and inflation reduces the future purchasing power of the target. A million pounds several decades from now is not equivalent to a million pounds today.
The useful lesson is that the contribution and the time allowed both matter enormously. Increasing the monthly amount can bring the target forward, while starting earlier gives smaller contributions more time to grow.
What if markets fall after I invest?
A broad fund spreads exposure across companies, but it doesn’t remove market risk. I need to be prepared for the account value to go down as well as up. If a fall would force me to sell because I need the money immediately, the investment may not fit that goal.
I also wouldn’t build a plan that depends on achieving 9%. I would look at lower-return scenarios and ask whether the contribution, timescale or target needs changing. That is more useful than choosing the most attractive line on a calculator.
The emotional part matters as well. A simple arrangement can reduce the temptation to keep switching, but only if I understand why I chose it. Regularly checking whether the investment still fits my goals is different from reacting to every week’s headlines.
Where index funds fit alongside property
I don’t see property, businesses and funds as enemies competing for a single place in my life. They give me different things. Property offers control and the ability to use mortgages, while businesses can offer substantial opportunities alongside substantial demands.
Index funds give me a relatively simple way to hold a liquid investment portfolio without managing individual assets every day. There is still investment risk, but the work involved is very different from owning and running rental property.
My property versus index funds comparison explores that decision more fully. If you’re working towards an earlier milestone, my first £100,000 guide compares cash saving, funds and property using regular contributions.
If you’d like to discuss whether property belongs in your wider plan, book a free property strategy call. For property-focused support, you can explore Starter Club or Done For You and a 20-minute suitability call. With funds, my own approach remains deliberately simple: understand what I own, control the costs, invest consistently and allow time for the plan to work.