Before You Start
- Basic understanding of ETFs (Exchange-Traded Funds) and how they function
- Access to your broker account (e.g. DEGIRO, Trade Republic, Interactive Brokers)
- Knowledge of which ETFs you hold or plan to buy (ISIN, ticker, fund factsheet)
- Willingness to check official documentation for your platform and ETF
Time needed: 30-45 minutes
What you'll need: Calculator or spreadsheet, internet access, broker login
Understanding what you really pay to invest in ETFs is crucial for every European investor. The sticker price—TER (Total Expense Ratio)—is just the beginning. Smart investors know to check for extra costs: spreads, platform fees, taxes, and even currency conversion. This step-by-step guide will show you how to use an ETF cost calculator Europe approach to reveal your full, all-in investing cost, using EUR-based examples and real-world platforms.
For the bigger picture on building a low-cost index portfolio, see our Ultimate Guide to European Index Funds (2026): Low-Cost Wealth Building in EUR.
Step 1: Identify the ETF’s TER (Total Expense Ratio)
What to do: Find the official TER for your chosen ETF. This is usually listed on the provider’s website (e.g. iShares, Vanguard, Xtrackers), your broker platform, or in the ETF’s factsheet (look for “Ongoing Charges” or “Total Expense Ratio”).
- Example: For iShares Core MSCI World UCITS ETF (Acc) (ISIN: IE00B4L5Y983), the official TER is 0.20% per year.
Why it matters: The TER is subtracted automatically from fund assets, silently eating into your returns. It covers fund management, custody, and admin—but not everything!
What can go wrong: Many investors stop here, missing costs that the TER doesn’t cover (see next steps).
Pro Tip
Compare TERs across similar ETFs. For example, CSPX (iShares S&P 500) and VUSA (Vanguard S&P 500) both have very low TERs, but differences can add up over decades. See our breakdown: The Best EUR-Denominated S&P 500 ETFs in 2026.
Step 2: Calculate Broker Platform Fees
What to do: Check your broker’s fee page for:
- Annual custody or platform fee (often a % of assets or a fixed annual fee)
- Trade commissions (per buy/sell order)
- Any “inactivity” or “foreign exchange” surcharges
Example (2026, single ETF, €10,000 investment):
- DEGIRO: No custody fee for standard ETFs. Typical trade commission: €2.00 + 0.03% per order. No annual platform fee.
- Trade Republic: No custody or platform fee. €1.00 per trade. No annual platform fee.
- Interactive Brokers (IBKR): No inactivity fee. Minimal commission (as low as €1.00 per trade). No annual platform fee.
Why it matters: Platform fees can quietly erode returns, especially for smaller portfolios or frequent traders.
What can go wrong: Some brokers (mainly banks or legacy platforms) charge up to 0.25%–0.50%/year in custody fees—this can easily double your “all-in” cost versus low-cost brokers.
Pro Tip
If you use a monthly savings plan (e.g. €100/month into an ETF), platforms like Trade Republic and Scalable Capital often offer commission-free or discounted plans. In Trade Republic, tap Portfolio → Savings Plan → Select ETF to set up automated investing for €0 commission (as of 2026).
Step 3: Estimate Bid-Ask Spread Cost
What to do: When buying or selling an ETF, check the current bid (sell) and ask (buy) prices. The spread is the difference. Calculate the % spread:
Bid: €68.10 | Ask: €68.20 Spread: €0.10 / €68.15 (mid-price) ≈ 0.15%
Why it matters: Every time you buy or sell, you “lose” half the spread. For liquid ETFs (like CSPX, VWCE, IWDA), spreads are often below 0.10%, but niche or thematic ETFs can be much higher.
- Example: Buying €5,000 of a large ETF with a 0.10% spread costs about €5 (one-time, not annualised).
What can go wrong: Trading outside main market hours, or in illiquid ETFs, can double or triple your spread cost. Always check the live spread before placing an order.
Step 4: Include Transaction Taxes (Where Applicable)
What to do: Check if your country charges a financial transaction tax (FTT) on ETF purchases. France, Italy, Belgium, and Spain have such taxes—most other EU countries do not (as of 2026).
- Example (France): French FTT is 0.30% on purchases of French shares, but generally does not apply to ETFs (always confirm with your broker).
- Belgium: The “Tobins tax” applies to ETF trades, typically 0.12%–1.32% depending on the ETF type and domicile. For a €10,000 ETF buy, you might pay up to €132 in tax.
Why it matters: Even a one-off tax can have a big impact if you’re investing a lump sum.
What can go wrong: Failing to account for these taxes can make a “cheap” ETF much more expensive than it seems.
Step 5: Add Currency Conversion Costs
What to do: If you buy a non-EUR-denominated ETF (e.g. USD fund on LSE), your broker will convert your EUR to the ETF’s currency. Check your broker’s FX fee:
- DEGIRO: 0.25% FX fee (AutoFX) or 0.03% (manual FX)
- Trade Republic: Only offers EUR-denominated ETFs for EU clients (no FX fee in this case)
- Interactive Brokers: 0.002%–0.03% FX fee (very low, manual conversion possible)
- Example: Buying €10,000 worth of a USD ETF via DEGIRO incurs €25 in FX fees (0.25%). If you stick to Xetra-listed EUR ETFs, you avoid this entirely.
Why it matters: FX costs are often overlooked, but can eat a chunk of your returns, especially if you rebalance or trade frequently.
What can go wrong: Some brokers auto-convert at high rates, or hide FX fees in the spread. Always check the ETF’s trading currency and your broker’s FX policy.
Step 6: Checklist – Build Your All-In ETF Cost Calculator (Europe, 2026)
For each ETF and broker, add up these costs annually:
- TER: (e.g. 0.20%)
- Platform/custody fee: (e.g. 0.00% for DEGIRO, Trade Republic, IBKR)
- Trading commissions: (e.g. €1–€2 per buy/sell, annualise if saving monthly)
- Bid-ask spread (one-off): (e.g. 0.10% per trade, split over holding period)
- Transaction tax: (if applicable, e.g. 0.12%–1.32% in Belgium)
- Currency conversion: (e.g. 0.25% if not buying in EUR)
Sample Calculation: €10,000 invested in IWDA (EUR, Xetra) via DEGIRO
- TER: 0.20% = €20/year
- Custody/platform: €0/year
- Commission: €2.00 (one-off, or €24/year if 12 monthly buys)
- Bid-ask spread: ~0.05% = €5 (one-off, or €60/year if 12 monthly buys)
- Transaction tax: €0 (not applicable in most EU countries for ETFs)
- Currency conversion: €0 (buying EUR-listed ETF)
Total Year 1 Cost (single buy): €20 (TER) + €2 (commission) + €5 (spread) = €27 or 0.27%
Total Ongoing Annual Cost: €20 (TER)
Pro Tip
Use a spreadsheet to track your actual costs. Create columns for each ETF, broker, and fee type. Review at least once per year—costs and broker policies can change!
Common Mistakes When Calculating ETF Costs
- Ignoring non-TER costs: Only looking at the TER hides most real-world costs.
- Assuming all brokers are “free”: Some charge hidden custody, inactivity, or FX fees.
- Not checking tax rules: Transaction and withholding tax rules vary by country and ETF domicile.
- Buying non-EUR ETFs unnecessarily: EUR ETFs on Xetra, Borsa Italiana, or Euronext avoid FX fees for EUR investors.
- Overtrading: Frequent trading amplifies commission and spread costs.
Next Steps
- If you’re still building your portfolio, see our Beginner’s Playbook for Building a Diversified EUR Portfolio with Just 3 ETFs.
- Ready to compare brokers? See our head-to-head: Trade Republic vs. DEGIRO vs. Scalable Capital: Best EUR Broker for 2026 Index Fund Investors?
- Already own ETFs? Review your annual costs and rebalance tax-efficiently using our guide: How to Rebalance Your EUR ETF Portfolio Tax-Efficiently in 2026.
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.