ISA ideas: low-cost index tracker fund options

If you want to invest in a stock market, index-tracking funds offer a low-cost option. Rather than rely on a fund manager to actively pick a portfolio of shares, an index tracker replicates the performance of an index.

This passive approach is cheaper to operate and therefore the charges are lower. Actively managed funds typically charge around 0.75% a year; passively managed funds can cost less than 0.10% a year.

Index funds mirror all manner of markets and investment types. Most commonly they track the stock market of a specific country, such as the FTSE 100, the UK’s largest companies, or the S&P 500 of the US. They also commonly pull together multiple markets into one fund. 

They are typically held in a Stocks and Shares ISA, Self-invested Personal Pension (SIPP) or an investment account. 

There are 15 on our Select 50 list of favoured funds covering a wide variety of regions and investment types.

Here’s a closer look at four index funds from this list that focus on the UK, US and global stock markets.

1. iShares Core FTSE 100

This fund tracks the FTSE 100 index which is made up of the 100 largest companies by value listed in London. 

The biggest holdings include the likes of Shell, AstraZeneca, HSBC, Unilever and BP. These companies are based in the UK but also operate internationally. This characteristic means the index and the fund has more of an international bent.

The fund, run by giant investment firm BlackRock, is actually an exchange-traded fund (ETF). We explain these here: exchange traded funds. These tend to be a little cheaper than traditional tracker funds. This particular ETF offers a cheap way to access the FTSE 100 with a 0.07% ongoing annual charge. The current yield is 2.74%, which is not guaranteed.

• More on iShares Core FTSE 100

2. Vanguard FTSE 250 ETF

This fund is an exchange-traded fund that tracks the FTSE 250 - an index focused on smaller to medium sized UK companies and therefore better reflects the health of the British economy than a FTSE 100 tracker. The largest holdings include investment firm IG Group and housebuilder Taylor Wimpey. 

The fund’s ongoing charge is 0.10% a year and it pays a yield of 3.68%. 

• More on Vanguard FTSE 250 ETF 

3. Vanguard S&P 500 ETF

This fund provides a cheap and easy way to invest in the US stock market by tracking the popular S&P 500 index. It provides access to the world’s largest technology companies including Apple, NVIDIA, Microsoft, Amazon and Facebook-owner Meta.

The fund has a 0.07% ongoing charge. The yield for the US market is lower than for the UK with the fund currently paying income of 0.95%.

An alternative way to invest in US shares is via an ‘equal-weighted’ tracker fund. Instead of holding shares from the S&P 500 based on their market value, it holds the top 500 companies in even amounts. The Legal & General S&P 500 US Equal-Weight Index, one such fund, was added to our Select 50 list last year. 

• More on Vanguard S&P 500 ETF

4. Legal & General Global Equity Index

L&G is a big player in index-tracking funds with a well-regarded capability. Its global equity fund backs a range of the world’s markets based on their size. That means a large amount is allocated to the US - currently 66.5% - compared to 8.1% in the eurozone and 5.7% in Japan. The allocation and holdings of each fund can be found on the ‘portfolio’ tab on the relevant data page. It comes with an ongoing cost of 0.13% and currently pays a yield of 1.3%.

• More on Legal & General Global Equity Index

What about funds with an active manager?

By choosing a tracker fund, you remove the need to monitor the performance of an active fund manager. But there are plenty of choices to consider. Our Select 50 list, devised by fund analysts, can help narrow the field and simplify your choice. 

And if you know which region you’d like to invest in, our articles can help narrow down the choice within the UK, US, Europe, Asia and emerging markets.

Our guide to the cheapest markets may also be helpful.
 

Our platform charge

On top of the ongoing cost of the funds, Fidelity charges a competitive fee for holding your funds. This is typically 0.35% a year (or 0.20% on larger portfolios). However, for shares and ETFs, fees are capped at £90 a year (£7.50 a month). Bear in mind that funds are free to buy and sell but ETFs and shares are subject to a dealing charge of £7.50.

• Find out more about fees and charges

Got a burning question you want to ask? Why not drop us a line. Click here to ask your question.

• Read: Top 10 best-selling ISA and SIPP funds of 2026
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• Read: How to invest like a millionaire

Important information - investors should note that the views expressed may no longer be current and may have already been acted upon. There is no guarantee that the investment objective of any Index Tracking Sub-Fund will be achieved. The performance of the sub-fund may not match the performance of the index it tracks due to factors including, but not limited to, the investment strategy used, fees and expenses and taxes. Overseas investments will be affected by movements in currency exchange rates. Investments in emerging markets can be more volatile than other more developed markets. This information is not a personal recommendation for any particular investment. There is a risk that the issuers of bonds may not be able to repay the money they have borrowed or make interest payments. When interest rates rise, bonds may fall in value. Rising interest rates may cause the value of your investment to fall. Reference to specific securities should not be construed as a recommendation to buy or sell these securities and is included for the purposes of illustration only. Tax treatment depends on individual circumstances and all tax rules may change in the future. Withdrawals from a pension product will not be possible until you reach age 55 (57 from 2028). If you are unsure about the suitability of an investment you should speak to one of Fidelity’s advisers or an authorised financial adviser of your choice.