What Should You Compare in an Online Broker Before Opening an Account?

Updated

An online broker is the platform you use to place buy and sell orders for stocks, ETFs, options, futures, currencies, bonds, and funds, and to hold and manage those positions over time. Before opening an account, compare candidates on six things: commission model, non-commission costs, execution quality and market access, platform and research fit, account minimums and cash/margin terms, and security and regulatory protections. The right choice depends on your trading style and how much you trade, not on a single headline rate.

Start with what the broker actually lets you trade

A broker's product list determines whether it can even serve your strategy. Interactive Brokers, for example, lists stocks, ETFs, options, futures and futures options, spot currencies, US spot gold, bonds, mutual funds, prediction markets, and hedge funds, with direct global market access.

If your plan involves only US stocks and ETFs, a broad product list matters less. If you trade futures, currencies, or international markets, product coverage and market access move to the top of the comparison.

Compare commission structures on the same trade

Commission models are not directly comparable until you price the same order through each one. Interactive Brokers publishes three structures:

  • Fixed — a set per-share or per-contract rate.
  • Tiered — rates that change with monthly volume.
  • $0 commissions — advertised on US stocks and ETFs with IBKR Lite.

The key question is which model applies to your volume and order sizes. A $0 model can be the cheapest option for low-volume US stock and ETF trading, while tiered pricing may cost less at higher volumes. Check the broker's own commission page for the current schedule rather than assuming a headline rate applies to every product.

Look past commissions at the other costs

Commissions are only one line item. Interactive Brokers' pricing pages show several cost and income categories worth comparing across brokers:

Cost or income item What to check
Market data Real-time vs. delayed data, and any monthly fees
Margin rates The rate charged to borrow; IBKR lists margin loans starting at USD 4.38%
Cash interest Interest earned on uninvested cash; IBKR lists up to USD 3.38%
Short selling Cost of borrowing stock to short
Other fees Account minimums and billing, especially for institutional clients
Research and news Whether research is bundled or billed separately

A broker with low commissions but expensive market data or a high margin rate can cost more overall than a broker with slightly higher commissions. Match each line to how you actually trade: a cash-only long-term investor cares about cash interest and data fees, while a margin trader cares most about the borrow rate.

Check execution quality and order types

Execution quality determines how much of your expected price you actually get. Interactive Brokers emphasizes best execution and direct market access, and lists a range of order types and tools including Overnight Trading, Fractional Shares, Recurring Investments, and Risk Navigator.

For comparison, ask each broker:

  • Does it offer direct market access, or route through an intermediary?
  • Which order types are available for your products?
  • Does it publish execution-quality statistics?
  • Does it support the session hours you need, such as overnight trading?

Match the platform and tools to your style

Platform fit is where brokers differ most for individual traders. Interactive Brokers lists several platforms with different intended users:

  • Client Portal — browser-based trading and account management.
  • IBKR Desktop — a streamlined, high-speed desktop platform.
  • IBKR Mobile — trading on iOS and Android.
  • Trader Workstation (TWS) — a professional trading platform.
  • IBKR GlobalTrader — simplified mobile trading.
  • IBKR Prediction Markets — trading yes-or-no questions on events.

It also offers paper trading with simulated funds, PortfolioAnalyst for unified portfolio data, and professional-grade reporting. If you are new to a platform, paper trading lets you test order entry and tools before committing real capital.

Review account minimums, security, and protections

Two final checks:

  • Account minimums and billing — some account types carry minimums or fees. Interactive Brokers lists an institutional client account minimum and client billing under other fees, so confirm which rules apply to the account you plan to open.
  • Security and regulatory protections — Interactive Brokers highlights "Strong client protection" and "Strength & Security" as reasons clients choose it. Verify the specific protections, compensation schemes, and regulators that apply in your country of residence, since these vary by entity.

A practical comparison sequence

  1. List the products and markets you need.
  2. Price one representative trade under each commission model.
  3. Add market data, margin, cash interest, and short-borrow costs for your expected activity.
  4. Check execution quality and the order types you rely on.
  5. Test the platform, using paper trading if available.
  6. Confirm account minimums, protections, and the regulator for your location.

Work through these in order, and the comparison resolves into a decision based on your own trading pattern rather than on any single advertised rate.