Why fees matter more than you think

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The silent portfolio killer

When people think about investing, they focus on picking the right stocks or funds. But there's a quieter, more consistent factor that shapes your long-term returns: fees.

A fee of 1% or 1.5% might sound tiny, but over decades of compounding, the difference between paying 0.25% and 1.5% in annual charges can add up to tens — even hundreds — of thousands of pounds. That's money that could have been working for you, not for your platform or fund manager.

The maths: a real example

Let's look at two investors. Both start with £10,000 and add £500 a month for 30 years. Both earn an average annual return of 7% before fees:

• Investor A pays 0.25% in annual fees — typical of a low-cost platform with an inexpensive ETF.
• Investor B pays 1.5% in annual fees — typical of a traditional actively managed fund on a high-cost platform.

After 30 years, Investor A ends up with roughly £546,000. Investor B ends up with roughly £406,000.

That 1.25% difference in fees cost Investor B approximately £140,000 — about 26% of their potential wealth, gone. And both investors took the same market risk.

Where fees hide

Fees come in several forms, and some are more visible than others:

• Trading commissions. A flat fee every time you buy or sell. These can quickly erode returns if you trade frequently. Abervest charges £0 commission on stock and ETF trades.
• Ongoing fund charges (OCF). The annual fee a fund charges to manage your money. Actively managed funds typically charge 0.5%–1.5%, while passive index trackers can be as low as 0.03%–0.15%.
• Platform fees. What your investment platform charges, usually as a percentage of your assets or a flat monthly fee. Some platforms also charge exit fees when you transfer out.
• FX fees. When you trade in a currency other than sterling, some platforms add a hidden markup to the exchange rate. At Abervest, we keep our FX rates low and transparent.
• Inactivity and admin fees. Some providers charge you simply for holding an account. Always check the small print.

Why low-cost investing wins

The academic evidence is clear: after fees, the majority of actively managed funds fail to beat their benchmark over the long term. A low-cost, broadly diversified approach — often using passive index funds or ETFs — has consistently delivered better net returns for everyday investors.

This doesn't mean you should never pay for active management. Some funds do outperform. But the burden of proof is on the higher fee to justify itself. Always ask: what am I getting for this extra cost?

What to check on your current portfolio

Take 10 minutes to review your current setup:

• What's the total annual cost of your investments, including platform fees, fund charges, and trading costs?
• Are you paying for active management when a low-cost tracker might suit you just as well?
• Are there any exit fees or hidden charges you weren't aware of?

Even a small reduction in fees can compound into a meaningfully larger retirement pot. It's one of the few things in investing you can actually control — and it's worth getting right.

Risk disclaimer: When you invest, your capital is at risk. The value of investments can go down as well as up, and you may get back less than you invest. This article is for informational purposes only and does not constitute financial advice. Tax treatment depends on individual circumstances and may change in the future.