The True Cost of Spreads: How Hidden ETF Trading Fees Affect Your EUR Portfolio

When you buy or sell an ETF in Europe, you pay more than just the visible broker commission. The "spread"—the hidden gap between the price you can buy and sell at—quietly eats into your returns. This guide explains exactly how ETF spreads work in the European context, why they matter for your 2026 portfolio, and how you can minimise their impact using actionable strategies with real EUR-based examples.

Step 1: Understand What ETF Spreads Are (and Why They Exist)

Before you can minimise spread costs, you need to know what they are. The spread is the difference between the bid price (what buyers are willing to pay) and the ask price (what sellers want to receive) for an ETF. This gap is often overlooked, but it’s a real, unavoidable cost every time you trade.

• Bid price: The highest price a buyer is willing to pay for your ETF.
• Ask price: The lowest price a seller is willing to accept.
• Spread: Ask – Bid. This is your hidden fee.

Example: You want to buy 10 units of VWCE (Vanguard FTSE All-World UCITS ETF, ISIN: IE00BK5BQT80). On Xetra (a major European exchange), you see:

• Bid: €114.80
• Ask: €115.10

The spread is €0.30 per unit. If you buy at €115.10 and immediately sell at €114.80, you lose €0.30 per share—before broker commissions or taxes.

Why does this matter? Spreads are set by market makers and reflect liquidity, risk, and trading volume. In illiquid ETFs or on less active exchanges, spreads can widen significantly, increasing your hidden costs.

Step 2: Calculate the Real Cost of ETF Spreads in EUR

Let’s quantify the impact with a real example using CSPX (iShares Core S&P 500 UCITS ETF, ISIN: IE00B5BMR087):

• You want to buy 50 units of CSPX.
• Bid: €420.05
• Ask: €420.25
• Spread: €0.20 per unit

Hidden cost: 50 units × €0.20 = €10

This cost is invisible on your broker statement. If you later sell at the bid price, you’ve effectively paid €10 just to cross the spread. Multiply this by multiple trades per year, and the cost adds up.

When does it matter most? Spreads matter more when:

• You trade large amounts (cost scales with volume)
• You trade in less liquid ETFs (e.g., niche sectors or small providers)
• You trade outside of peak market hours (spreads widen)

Step 3: Compare Spreads Across European Brokers and Exchanges

Not all brokers or exchanges are the same. Your spread cost depends on:

• Broker routing: Some brokers (e.g., Trade Republic, Scalable Capital) may route orders to specific exchanges (e.g., Lang & Schwarz, Gettex) where spreads can be wider than on Xetra or Euronext.
• Market hours: Trading outside of the main exchange hours increases spreads.
• ETF liquidity: Large, popular UCITS ETFs have tighter spreads.

How to check spreads on your platform:

• Trade Republic: In the app, search for your ETF (e.g., VWCE), tap on it, and scroll to the “Market Data” section to view bid/ask prices.
• DEGIRO: Log in, search for your ETF, and check the “Order Book” tab for real-time bid/ask quotes. DEGIRO offers access to multiple European exchanges.
• Scalable Capital: In the web platform, search for your ETF, and view the “Overview” tab for live prices. Check “Trading Venue” to see which exchange is used.

Example: On 2026-04-15, VWCE spread:

• Xetra: Bid €114.95 / Ask €115.00 (Spread: €0.05)
• Gettex: Bid €114.80 / Ask €115.10 (Spread: €0.30)

Buying on Gettex costs you €0.25 more per share, purely due to spread.

Step 4: Use Limit Orders to Control Spread Costs

What is a limit order? A limit order lets you set the maximum price you’re willing to pay (when buying) or the minimum you’ll accept (when selling). This helps avoid paying an unnecessarily wide spread.

How to do it:

• Trade Republic: Tap on your chosen ETF → "Buy" → Switch order type from "Market Order" to "Limit Order" → Enter your desired price (e.g., mid-point between bid/ask) → Confirm.
• DEGIRO: Select the ETF → "Buy" → Choose "Limit" → Enter your price → Place order.
• Scalable Capital: Click your ETF → Buy/Sell → Choose "Limit" → Enter limit price → Execute order.

Why it matters: Market orders fill instantly but always at the current ask (buy) or bid (sell)—meaning you always pay the full spread. Limit orders let you “meet in the middle” and save part of the spread—especially for larger trades.

What can go wrong? If your limit price is too far from the current market price, your order may not execute at all. For liquid ETFs during normal hours, setting your limit price at the mid-point often fills within a few minutes.

Step 5: Time Your Trades for Optimal Spreads

Spreads are narrowest when the underlying markets (e.g., US or European stock exchanges) are open and trading is most active. In Europe, this is typically between 09:00 and 17:30 CET for Xetra. Spreads widen at open, close, and during lunch hours.

Actionable tips:

• Trade major ETFs (like VWCE, CSPX) between 10:00–16:00 CET
• Check bid/ask before placing your order—wait if the spread is unusually wide
• If using savings plans, check if your broker executes during main market hours (some execute early morning, when spreads are larger)

Outcome: You should see your ETF orders filled with minimal spread cost—often just a few cents per share on liquid ETFs.

Step 6: Weigh Spread Costs Against Other ETF Fees

Spreads are just one part of total ETF trading costs, alongside:

• Broker commissions (e.g., €1 per trade on Trade Republic, €2–4 on DEGIRO)
• ETF Total Expense Ratio (TER)
• Foreign exchange fees (if trading in non-EUR ETFs)

Key insight: For frequent traders and large trades, spread costs can easily exceed broker commissions. For buy-and-hold investors, spreads are a one-time “entry/exit” cost, but still worth optimising—especially if rebalancing or switching ETFs.

For a deeper dive into how leverage and trading mechanics can further affect your costs and risks, see How Leverage Works in European Brokerages: The 2026 Guide to Risks, Margin Calls, and Smart Use.

Common Mistakes

• Ignoring the spread: Many investors focus only on commissions, underestimating the impact of spreads—especially with large or frequent trades.
• Always using market orders: This guarantees you pay the full spread every time. Use limit orders whenever possible.
• Trading illiquid ETFs: Small, niche, or “exotic” ETFs can have spreads of €1+ per share, making them much more expensive to trade.
• Placing trades outside of main market hours: Spreads can double or triple when underlying markets are closed.
• Not checking the execution venue: Some brokers route to less liquid exchanges by default. Know where your trade will be executed.

Next Steps

• Review your last ETF trades: What spreads did you pay? (Check your broker’s order history for bid/ask data at execution.)
• Experiment with limit orders on your next purchase—try setting the limit at the mid-point between bid and ask.
• Compare major brokers and exchanges for your preferred ETFs. Consider switching if you consistently face wide spreads.
• Revisit your trading schedule: Can you trade during more liquid hours?
• For more advanced strategies or if you’re considering leverage, read How Leverage Works in European Brokerages: The 2026 Guide to Risks, Margin Calls, and Smart Use.

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Always do your own research and consider consulting a qualified financial advisor before making investment decisions.