The hidden costs: spread, transaction fees, FX conversion

TER is the famous number. It’s also not the whole picture. For a small trade on a popular ETF, the effective cost can be 2-4× the TER in the first year.

Today: all the costs beyond TER, and how to minimize them.

The five cost layers

Total cost of owning an ETF = TER + these:

Transaction fees. What your broker charges per buy/sell.
Bid-ask spread. Difference between buy and sell price at the moment of execution.
FX conversion costs. If ETF is USD-denominated and you pay in EUR.
Imposta di bollo. 0.2%/year Italian tax on financial assets.
Opportunity cost of cash while not invested.

Let’s dig into each.

Transaction fees

Italian broker fees as of 2025:

Broker	Typical fee per trade
Fineco	€19
Directa	€5
Trade Republic	€1
Scalable Capital (Prime)	€0 (up to €250 PAC trades) or €1
Degiro	€0-3 (depending on ETF)
IBKR	<€1

For a €1,000 trade:

Fineco 19/1000 = 1.9%.
Directa 5/1000 = 0.5%.
Scalable 1/1000 = 0.1%.

Matters for small trades. On a €10,000 trade, Fineco’s €19 is 0.19% — less relevant.

For PAC (Piano di Accumulo): most brokers charge per-trade. Fineco ~€19 per automated PAC. Scalable Capital €0 for PAC. Big difference if you’re investing €300/month over 30 years = 360 trades.

Math: 360 × €19 = €6,840 in PAC fees at Fineco vs ~€0 at Scalable. Over 30 years, that’s a large gap.

Bid-ask spread

The spread is what you effectively pay as a “transaction tax” to the market-maker.

For a popular global equity ETF (Vanguard FTSE All-World) on Borsa Italiana: typical spread 0.02-0.08% during normal market hours.

For a smaller or less liquid ETF: spread can reach 0.3-1.0%.

On a €10,000 trade:

0.05% spread = €5 each way, €10 round trip.
0.5% spread = €50 each way, €100 round trip.

Rule: check the spread on your specific ETF at the moment of trade. Avoid buying when spread is abnormally wide (first 15 minutes of market open, last 15 minutes before close, or after big news).

FX conversion

Big hidden cost for European investors.

An ETF like Vanguard FTSE All-World (VWCE) trades in EUR on Borsa Italiana but its fund currency is USD. When you buy in EUR, the exchange converts the trade to the fund’s USD currency internally — transparently for most brokers.

But if you buy a USD-denominated share class directly on an exchange like LSE, your broker may convert EUR → USD at retail rates: spread of 0.25-0.75%.

On a €10,000 position: €25-75 in FX each way. €50-150 round trip.

How to avoid: always buy EUR-listed variants of ETFs when available. Listed on Borsa Italiana or Xetra in EUR. No retail FX exposure at your broker (the fund handles internal FX).

For Italian retail investors: most major ETFs have EUR listings. Use them.

The imposta di bollo

Italian tax on all Italian-resident investment holdings:

0.2%/year on financial instruments: stocks, bonds, ETFs, mutual funds.
€34.20/year flat on bank deposits over €5,000 (for individuals).
0.2%/year on bank/investment accounts held with foreign intermediaries (declared on Quadro RW).

This applies regardless of broker. A €100,000 portfolio generates €200/year in imposta di bollo, perpetually.

It’s a tax, not a broker fee. But it’s real and compounds over decades.

Total cost walk-through

Let’s compute the all-in annual cost for Sofia’s portfolio:

Assumptions:

€50,000 portfolio (mix of VWCE + EUR bond ETF).
Fineco broker.
€500/month PAC.

Annual costs:

TER (weighted): 0.20% × €50,000 = €100.
Imposta di bollo: 0.2% × €50,000 = €100.
PAC fees: €19 × 12 = €228.
Spread (on PAC buys): 0.05% × €6,000/year = €3.
FX: 0 (EUR-listed ETF).
Total annual cost: ~€431.

As % of portfolio: 0.86%/year.

Not bad. But at Scalable Capital with €0 PAC fees, her total would drop to:

TER: €100.
Imposta di bollo: €100.
PAC fees: €0.
Spread: €3.
Total: €203/year.
0.41%/year.

Saving ~0.45%/year = ~€225 saved. Over 30 years compound: €15,000-20,000 saved.

Worth switching brokers for. Sofia might migrate to Scalable Capital once her portfolio is big enough for the friction to justify.

FX on non-EUR-listed ETFs

Some attractive ETFs don’t have EUR listings. The most common case: US-domiciled ETFs (VOO, VTI, SPY). Italian retail can’t normally buy these due to PRIIPs regulation, so not usually an issue.

For EU-domiciled ETFs, EUR listings usually exist. Rare exceptions: small or niche ETFs only on LSE in USD/GBP.

If you must buy a non-EUR listing:

Accept the FX cost at each trade.
Consider it as ongoing friction.
Ask if your broker offers multi-currency accounts (IBKR, some others) where you can hold USD/GBP balances and avoid per-trade conversion.

Spread widens during crises

Important: during panic moments, spreads blow out. A 0.05% spread can become 0.50% during 2020 March. This is when market makers step back and liquidity drops.

If you must trade during a crisis, use limit orders. Be prepared for partial fills or delays.

Buy-and-hold investors don’t face this often.

Broker switching costs

Moving a brokerage from one provider to another (“trasferimento di portafoglio”) usually involves:

Receiving broker’s transfer process: 2-6 weeks in Italy.
Cost: usually €0-€50 at the receiving broker. Some charge per holding.
Giving broker may charge per holding to release (€5-20 each).
Tax implications: usually none — transfers between regime-amministrato brokers preserve cost basis. But verify with each broker.
No tax event (no realized gains) if the transfer is processed correctly.

So switching is usually cheap. The exception: some older bank brokers charge meaningful transfer-out fees. Read contracts.

Over a lifetime, switching brokers 1-3 times is reasonable as your portfolio grows.

The true cost of your fondo comune

For Italian retail holding active mutual funds:

TER (ISC): 1.5-2.5%.
Commissioni di ingresso: 0-3% one-time.
Commissioni di uscita: 0-2% if within 3-5 years.
Imposta di bollo: 0.2%/year.
Transaction costs within fund (hidden): 0.2-0.5%/year.

Total annual cost of owning an active Italian fund: 2-3% per year.

Compared to total cost of low-cost ETF: 0.3-0.6%/year.

Difference: 1.5-2.5% annually. On €100,000, that’s €1,500-2,500 per year you’re paying extra. Over 30 years: more than €100,000 of extra cost.

Avoiding the worst hidden costs

Simple rules:

Buy EUR-listed ETFs when available. Eliminates FX.
Use a broker with low PAC fees. Scalable, Directa, Trade Republic.
Stick with liquid, popular ETFs. Smaller spread.
Avoid trading during first and last 15 minutes of market. Wider spread.
Don’t hold expensive fondi comuni. High TER compounds wastefully.
Keep cash buffer at conto deposito earning interest, not at 0% in your brokerage account.

A worked example: hidden cost comparison

Three paths for investing €300/month for 20 years:

Path A: Traditional bank fondo comune at 2% TER

After 20 years at 5% gross / 3% net real return: ~€98,000.

Path B: Fineco with low-TER ETF + PAC fees

After 20 years at 5% gross / 4.5% net (TER + imposta di bollo + €19/mo PAC fees): ~€112,000.

Path C: Scalable Capital with same ETF, zero PAC fees

After 20 years at 5% gross / 4.8% net: ~€118,000.

Path C beats Path A by €20,000 — purely from fee differences.

The choice of broker matters as much as the choice of fund, especially for PAC investors.

What to do with this lesson

Three things:

Audit your total cost of investing. TER + PAC fees + imposta + spreads. Sum it up.
If paying > 1% all-in, optimize. Switch broker, switch ETF, or simplify.
For PAC, use a broker with €0-1 per PAC execution. Saves thousands over decades.

Sources

justETF.com — ETF data and spread analysis.
Borsa Italiana — ETF listing info. https://www.borsaitaliana.it/.
Agenzia delle Entrate — imposta di bollo rules.
Various broker fee schedules (Fineco, Scalable, Directa, Degiro public pages).

Next lesson: broker comparison for IT-resident investors — a head-to-head comparison of the main brokers. No affiliate links.