0% Commission Does Not Always Mean Zero Cost: What Investors Should Check

A 0% commission broker can remove one of the most visible costs of investing.

If no dealing commission is charged on a qualifying trade, that particular fee is genuinely reduced to zero.

But that does not necessarily mean the entire investment transaction — or the brokerage account itself — is free.

Investors may still encounter currency conversion costs, bid-ask spreads, account-related charges, transfer fees, product expenses or other costs depending on the broker, market and investment.

Investor.gov, the investor education service of the U.S. Securities and Exchange Commission, notes that investment costs generally fall into two broad categories: transaction fees and ongoing fees. Both can reduce the amount of money left in a portfolio to generate returns. Investor.gov provides an overview of how investment fees and expenses affect portfolios.

For investors, the useful question is therefore not simply:

“Is the commission zero?”

It is:

“Which cost is zero, and what other costs could still apply?”

What does 0% commission actually mean?

In most cases, zero commission refers to a specific charge associated with buying or selling an eligible investment.

A traditional commission may be:

• a fixed amount per trade
• a percentage of the transaction
• subject to a minimum charge

A qualifying zero-commission transaction removes that particular dealing fee.

That can be especially relevant for investors placing smaller or more frequent orders, because fixed commissions can represent a larger percentage of a small investment.

Consider this purely illustrative example:

Amount invested	Trading commission	Commission as % of investment
€100	€5	5%
€500	€5	1%
€1,000	€5	0.5%
€10,000	€5	0.05%

A €5 commission has a much greater proportional effect on a €100 trade than on a €10,000 trade.

If the commission on the qualifying €100 transaction were reduced from €5 to €0, that specific cost would no longer reduce the amount available to invest.

That is a real difference.

But it still does not answer what the total cost of the transaction may be.

Why zero commission is not the same as zero total cost

A brokerage transaction can involve more than one type of cost.

Investor.gov explains that brokerage customers may face transaction fees as well as other charges for maintaining, transferring or using an account. Its 2025 investor bulletin lists both transaction fees and ongoing or miscellaneous account costs.

Depending on the investment and account, relevant costs can include:

1. currency conversion costs
2. bid-ask spreads and execution costs
3. account and service fees
4. transfer or withdrawal-related charges
5. product-specific or statutory costs

Not every broker charges all of these.

The point is that commission is only one line in the overall pricing structure.

European regulation takes a similarly broad view.

Article 24 of MiFID II requires firms to provide appropriate information about all costs and related charges, and requires information addressed to clients or potential clients to be fair, clear and not misleading. Marketing communications must also be clearly identifiable as such. ESMA’s MiFID II Single Rulebook sets out these requirements in Article 24.

1. Currency conversion can still cost money

A broker may charge zero commission on a stock purchase while still applying a cost when currencies need to be converted.

Suppose an investor holds euros but wants to buy a U.S.-listed stock priced in dollars.

The transaction may require converting EUR into USD.

Depending on the provider, that conversion could involve:

• an explicit FX fee
• a percentage-based conversion charge
• an exchange-rate mark-up
• another pricing mechanism

This means a commission-free foreign stock purchase may still have an identifiable conversion cost.

The same issue may arise when the investment is later sold and the proceeds are converted back into euros.

FX fees are different from currency risk

A conversion fee and currency risk are not the same thing.

The fee is the cost of exchanging currencies.

Currency risk is the possibility that movements in exchange rates affect the value of a foreign investment when measured in the investor’s home currency.

Even if an investor pays no explicit FX fee, exchange-rate movements can still affect the investment outcome.

2. Bid-ask spreads can affect the transaction

Another cost can exist even when there is no separate commission or fee line.

Tradable securities generally have a bid price and an ask price.

The difference between them is the bid-ask spread.

An investor buying at the ask and immediately selling at the bid would normally experience that difference even if neither transaction carried an explicit dealing commission.

Spreads can vary depending on:

• market liquidity
• trading activity
• volatility
• market conditions
• the particular security

This is why transaction cost cannot always be measured by visible fees alone.

MiFID II’s best-execution rules recognise this broader concept.

For retail clients, Article 27 defines the best possible result in terms of total consideration, including both the price of the financial instrument and costs relating to execution. ESMA’s MiFID II Article 27 sets out the best-execution standard.

3. Account fees may exist separately from trading commission

A broker may charge nothing to execute a qualifying trade while applying fees elsewhere.

Investor.gov lists examples including:

• account maintenance fees
• inactivity fees
• minimum-balance fees
• account transfer charges
• account-closing fees
• wire-transfer fees
• platform-related fees

These charges vary significantly between providers, and many brokers do not apply all of them.

Investor.gov recommends reviewing the full fee schedule and disclosure documents before opening an account.

The practical lesson is simple:

Do not evaluate an account using one advertised fee in isolation.

Consider how you are likely to use the platform.

An inactivity fee may be irrelevant to an active investor but important to someone who intends to buy once and leave the account untouched for years.

A transfer fee may not matter today but could become relevant if the investor later wants to move securities to another broker.

4. Product costs can exist even when the broker charges no commission

It is also important to separate broker costs from investment-product costs.

An individual company share does not have an ETF-style annual expense ratio simply because it is held through a broker.

But ETFs, mutual funds and other collective investment products can have ongoing operating expenses.

These are usually deducted within the fund rather than appearing as a separate invoice from the broker.

Investor.gov explains that mutual funds and ETFs may contain annual operating expenses in addition to transaction-related costs. Its guide to investment fees explains how product expenses reduce investment returns.

So a platform could charge:

0% dealing commission

while the investment product itself still carries ongoing expenses.

Those are two different layers of cost.

5. Transfers, withdrawals and statutory charges may still apply

Some costs only become relevant later.

For example, an investor may eventually want to:

• withdraw cash
• transfer securities to another broker
• close an account
• trade on a market that applies statutory charges
• sell an investment subject to particular taxes or transaction duties

Investor.gov notes that brokers may charge miscellaneous fees such as transfer and account-closing fees, and that these can vary significantly between firms. The SEC’s investor bulletin on brokers’ miscellaneous fees explains these types of charges.

European cost-disclosure rules also take into account relevant costs across the investment service rather than only the initial purchase.

The useful comparison is therefore not just:

“What does it cost to buy?”

but:

“What could it cost to buy, hold, sell, convert, transfer and withdraw?”

So is a 0% commission broker actually cheaper?

It can be.

Removing a dealing commission removes a real cost.

For an investor who otherwise would have paid a fixed or percentage-based commission on the same transaction, zero commission can improve the cost structure.

But whether one brokerage account is cheaper overall depends on how the account is used.

For example:

Investor A

• invests €100 every month
• buys securities in the same currency as the account
• rarely transfers investments
• uses a platform with no other relevant recurring charges

For this investor, zero commission could be particularly meaningful.

Investor B

• buys foreign securities frequently
• converts currencies regularly
• transfers positions between platforms
• uses other paid account services

For this investor, FX and other costs may be just as important as the dealing commission.

Neither example identifies a “better” broker.

They show why the relevance of each fee depends on actual investor behaviour.

What should a zero-commission investor check?

Before relying on a 0% commission claim, ask:

• Which securities qualify?
• Are there transaction or monthly-volume limits?
• Does the offer apply to buying and selling?
• Which markets are included?
• Are FX conversions required?
• What spread or execution conditions apply?
• Are there account fees?
• Are there transfer fees?
• Are there product-level expenses?
• Are statutory market charges passed on?
• Can the pricing structure change?

The broker’s current fee schedule and legal documentation should answer these questions.

Why EU cost-disclosure rules matter

European regulation recognises that retail investors need more than a headline commission figure.

Under MiFID II, firms must provide clients with appropriate information about relevant costs and charges. Article 24 of MiFID II sets out the general information and cost-disclosure requirements.

ESMA has also stated that ex-post cost information should be presented in a way that is fair, clear and not misleading, with sufficient prominence for retail clients to find and understand it. It should not be mixed into marketing material in a way that makes it difficult to identify. ESMA’s Q&A explains how cost information should be presented to clients.

This is particularly relevant when a low or zero headline fee is used prominently in advertising.

The advertised claim may be accurate.

But investors still need enough information to understand the broader cost structure.

A practical example: €1,000 invested with 0% commission

Consider a hypothetical investor buying €1,000 worth of a foreign-listed security.

This example is purely illustrative and does not represent the pricing of any particular broker.

Item	Illustrative amount
Intended investment	€1,000
Trading commission	€0
Currency conversion cost	€5
Other explicit account fees	€0
Amount after illustrative FX cost	€995

The investor has genuinely paid 0% trading commission.

But the overall transaction was not completely cost-free because currency conversion cost €5.

There may also be a bid-ask spread that is not shown as a separate account debit.

If the investor later sells the security and converts the proceeds into euros, another conversion cost could apply.

This illustrates why commission and total cost should be treated as separate concepts.

Zero commission and execution quality are separate questions

Investors should also avoid assuming that commission is the only thing that matters when an order is executed.

Under MiFID II, investment firms executing retail client orders must consider factors including:

• price
• cost
• speed
• likelihood of execution
• likelihood of settlement
• size
• nature of the order

Article 27 requires firms to seek the best possible result, with retail execution assessed in terms of total consideration. ESMA provides the full best-execution requirements in the MiFID II Single Rulebook.

That means investors comparing brokers should consider both:

what the platform charges

and

how their orders are executed.

A simple 0% commission checklist

Question	Why it matters
Which trades qualify?	Zero commission may not cover every product or market
Are there limits?	Volume, frequency or other conditions may apply
What are the FX costs?	Foreign investments may require currency conversion
What is the spread?	Execution can still carry an economic cost
Are there account fees?	Trading and account charges are separate
What happens when I sell?	Costs may apply at exit as well as entry
Can I transfer my investments?	Transfer fees may matter later
Does the product itself have expenses?	ETFs and funds may carry ongoing costs
Are there statutory charges?	Some markets may impose taxes or other mandatory charges
Where is the full fee schedule?	The headline advertisement is not the complete pricing document

FAQ

Conclusion

A 0% commission broker can remove a meaningful investment cost.

For investors making smaller or frequent transactions, eliminating a fixed dealing commission may be particularly relevant.

But 0% commission does not automatically mean 0% total cost.

Depending on the platform and investment, investors may still encounter:

• FX costs
• bid-ask spreads
• account fees
• transfer charges
• product expenses
• statutory costs

The best way to evaluate a commission-free offer is therefore not to dismiss it — or assume it means everything is free.

Instead, understand exactly which fee has been reduced to zero and what costs remain.

Before choosing an investment platform, review the current fee schedule, product terms and execution information rather than relying on the headline commission rate alone.

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Disclaimer: This article is for general informational and educational purposes only and does not constitute investment, financial, tax or legal advice or a recommendation of any broker or investment platform. Investing involves risk, including the possible loss of capital. Fees, spreads, currency-conversion costs, product expenses, statutory charges, execution arrangements and platform terms vary by provider, jurisdiction, financial instrument and account type and may change over time. Always review the relevant provider’s current pricing, legal documentation and regulatory information before making an investment decision.

Sources & References

EU regulations & taxation

• European Commission / Taxation & Customs — Article 24 of MiFID II sets out the general information and cost-disclosure requirements
• ESMA provides the full best-execution requirements in the MiFID II Single Rulebook
• ESMA’s Q&A explains how cost information should be presented to clients

Broker comparisons & investing platforms

• Investor.gov — The SEC’s investor bulletin on brokers’ miscellaneous fees explains these types of charges

Additional educational resources

• Investor.gov — Its guide to investment fees explains how product expenses reduce investment returns
• Trading.com