A broker is the intermediary between you and the financial markets. Choosing the right one isn’t the most important investment decision (that’s asset allocation), but choosing poorly can cost you in fees, frustration, or — in the worst case — security. Here’s what to evaluate.
What a broker does
A broker holds your account, executes your buy and sell orders, safeguards your assets (in custody), and provides reporting for tax purposes. They don’t give you investment advice (unless you pay for that separately). They’re a tool — like a bank account, but for investments.
Your assets (shares, fund units) are legally yours, held in your name, and separated from the broker’s own assets. If the broker goes bankrupt, your investments are protected (up to regulatory limits). This is important: you’re not “giving your money” to the broker. They’re just the gateway.
Key criteria
Regulation. Non-negotiable. Your broker must be regulated by a recognised authority (FCA in the UK, BaFin in Germany, CNMV in Spain, SEC in the US, etc.). Regulation means investor compensation schemes, mandatory asset segregation, and oversight. Never use an unregulated platform regardless of how attractive it seems.
Fees. The primary ongoing cost. Look at:
- Account maintenance: Some charge monthly/annually, many don’t.
- Transaction fees: Per buy/sell order. Many modern platforms offer zero-commission trading for major markets.
- Spread: The difference between buy and sell price. Usually small for liquid assets but can be significant for exotic ones.
- Currency conversion: If buying US assets in euros, the FX fee matters.
- Inactivity fees: Some charge if you don’t trade regularly. Avoid these.
Available products. Does it offer the specific index funds/ETFs you want? Not all platforms carry all funds. Verify before opening an account.
Ease of use. A platform you find confusing is one you’ll avoid using. Modern interfaces with clear mobile apps make regular investing easier and more likely to become habitual.
Tax reporting. Does the platform provide the tax documents your country requires? This can save hours during tax season.
Domicile and tax treaties. An Irish-domiciled broker holding Irish-domiciled ETFs is often most tax-efficient for European investors due to withholding tax treaties.
Types of platforms
Traditional banks with investment services. Your existing bank may offer a brokerage account. Convenient (everything in one place) but often more expensive and with limited product range.
Online-only brokers. Purpose-built for investing. Usually cheaper, better interfaces, wider product selection. Examples vary by country but include platforms that offer low-cost ETF investing with automatic plans.
Robo-advisors. Automated platforms that choose and manage your portfolio for you based on a questionnaire. Higher fees than DIY (typically 0.3-0.7% annually on top of fund fees) but zero decisions required. Good for people who want complete automation.
Making the choice
For a simple index fund strategy (which is what this course recommends):
- Verify regulation in your country.
- Check that your chosen ETFs/funds are available.
- Compare total annual cost (including all fees) for your expected investment pattern.
- Test the interface — most offer demo accounts or free sign-up.
- Set up automatic monthly contributions.
Don’t agonise over this decision. Any regulated broker with your chosen funds available at reasonable cost will serve you well. The difference between the “best” and “second-best” broker is trivial compared to the cost of delaying your first investment while you research endlessly.
A broker is a tool, not a partner. Choose one that’s regulated, affordable, and carries the products you need. Set up automatic investments. Then forget about the broker and focus on what actually matters: consistent contributions over decades.
