What Is An Expense Ratio?

If you are looking at an ETF or fund and see a cost like 0.07%, 0.20% or 0.50%, you are probably looking at its expense ratio, OCF or ongoing charge.

The short version: it is the fund’s running cost.

This matters because investing already has uncertainty. Markets can rise and fall, capital is at risk and past performance is not a reliable guide to future returns. Costs are one of the few parts you can actually see before you invest, so it is worth knowing what they mean.

Quick answer: what is an expense ratio?

An expense ratio is the annual cost of running an investment fund, shown as a percentage of the money invested in that fund.

For example:

That does not mean you usually get a bill for £2, £20 or £100. In most cases, the charge is taken from within the fund and reflected in the fund’s performance.

So if I hold an ETF with an ongoing charge, I normally do not see a separate line in my account saying “expense ratio paid”. It is already baked into the fund.

Expense ratio, OCF and ongoing fund charges explained

The confusing part is that different platforms and documents use slightly different words.

Expense ratio

An expense ratio is a general term for the ongoing cost of a fund. It is especially common in US investing content, which is why beginners often see it on YouTube or American finance websites.

It is usually shown as a percentage per year.

OCF, or ongoing charges figure

In the UK and Europe, you will often see OCF, which stands for ongoing charges figure.

This is another way of showing the fund’s ongoing yearly cost. If I am looking at an ETF on a UK platform, OCF is usually the term I expect to see.

The FCA has previously said that, for UCITS funds, charges information in marketing material and on websites should use the OCF as the headline charges figure and be consistent with the Key Investor Information Document. You can read the FCA’s fund charges review here: TR14/7 clarity of fund charges.

Ongoing fund charges

Ongoing fund charges is the plain English version. It simply means the recurring cost of owning that fund.

You might see this wording on an investing platform, fund factsheet or Key Information Document.

How an expense ratio works in practice

Imagine a fund has an ongoing charge of 0.20%.

That means the annual running cost is roughly 20p for every £100 invested, or £2 for every £1,000 invested.

The fund manager uses this charge to cover the cost of operating the fund. Depending on the fund, that may include things like administration, management and other running costs.

The key point for beginners is this:

The charge reduces the return you receive from the fund.

If two funds invested in exactly the same things and performed exactly the same before fees, the lower-cost fund would leave more of the return with investors. Real life is not always that neat, but that is the basic idea.

Where to find the real expense ratio

Do not guess a fund’s cost from a blog post, forum comment or screenshot.

Before investing, I would check one or more of these:

• The fund factsheet
• The Key Investor Information Document, often shortened to KIID
• The Key Information Document, often shortened to KID
• The fund provider’s website
• The fund information page inside the investing platform

The number to look for may be called:

• OCF
• Ongoing charge
• Ongoing charges figure
• Total expense ratio
• Expense ratio

If you are using an app, it can be tempting to focus only on the chart. I have done that myself when browsing funds, especially early on. But the factsheet or Key Information Document is where the proper cost information should be checked.

The document name can vary by product and disclosure regime. For example, the FCA has discussed cost disclosure across PRIIPs Key Information Documents, UCITS Key Investor Information Documents and MiFID II requirements in its PRIIPs and UCITS statement.

Is a lower expense ratio always better?

Lower costs are generally attractive, but they are not the only thing that matters.

A fund with a low ongoing charge might still be unsuitable for what someone is trying to do. A fund with a higher charge might track a more specialist area, use a different method or come with different risks.

Things I would want to understand include:

• What the fund invests in
• Whether it is diversified or very concentrated
• Whether it is accumulating or distributing
• What currency it trades in
• Whether there are platform fees or foreign exchange fees as well
• How it fits with my own goals and risk tolerance

That is why I try not to look at fees in isolation. Costs matter, but they are only one part of understanding an investment.

If you are new to funds, my beginner ETF guide is a useful next step: ETF articles.

Expense ratio versus platform fees

An expense ratio is not always the only cost.

There can also be platform fees, trading fees, foreign exchange fees or other charges depending on the provider, account type and investment.

The important distinction is:

• Fund charge: the ongoing cost inside the ETF or fund
• Platform charge: what your investing platform may charge you
• FX fee: a currency conversion cost if you buy something in another currency

I use Trading 212 myself, but I still check fund costs separately because the ETF’s ongoing charge is not the same thing as the platform’s fees.

If you want more beginner platform content, I keep it here: Trading 212 articles.

Why expense ratios matter more over time

A small percentage can feel irrelevant at first.

For example, the difference between 0.10% and 0.50% on £1,000 is only about £4 a year.

But as a portfolio grows and the years pass, costs can add up. That does not mean the cheapest fund is automatically the best choice. It simply means ongoing charges deserve attention.

This is one reason I like keeping investing simple. When I first started taking ETFs more seriously, there were plenty of exciting funds to look at. The more I learned, the more I realised that boring details like charges, diversification and consistency matter.

Simple checklist before investing in a fund

Before I put money into a fund, I want to know:

1. What does it invest in?
2. What is the ongoing charge or OCF?
3. Are there any platform or currency fees?
4. Is it accumulating or distributing?
5. Is it broad and diversified, or narrow and specialist?
6. Have I checked the factsheet or Key Information Document?
7. Am I comfortable with the risk?

None of that tells me what will happen next. It just helps me understand what I am buying before I buy it.

My plain English definition

An expense ratio is the yearly running cost of a fund, shown as a percentage.

In the UK, you will often see the same idea described as the OCF or ongoing charge.

It is usually taken inside the fund rather than billed separately, but it still matters because it reduces the return investors receive. Always check the fund factsheet or Key Information Document rather than guessing from a chart or app screen.

Nothing here is financial advice or a personal recommendation. I am sharing how I understand the term as a beginner investor documenting my own learning. If you are unsure what is right for you, consider speaking to a regulated financial adviser and read the full site disclaimer: disclaimer.