A-Book vs B-Book Brokers: How Their Model Affects Your Commissions

When you send a client to a broker, you are also sending them into a specific relationship with that broker's trading desk — and that relationship shapes whether your commission and your client's outcome pull in the same direction or in opposite ones. Two brokers can offer identical spreads and near-identical rebate sheets on paper, yet pay you very differently over a year, because one runs an A-Book execution model and the other runs a B-Book model. Understanding which one a broker actually uses, and how it changes their incentives toward your traffic, is one of the most overlooked parts of partner selection.

This article breaks down what A-Book and B-Book actually mean operationally, how each model changes the commission structures available to you, and what questions to ask a broker's business development team before you commit volume to them.

What A-Book and B-Book actually mean

An A-Book broker passes your client's orders straight through to external liquidity providers — banks, prime brokers, or an ECN — and earns from the spread markup or a fixed commission on each trade. The broker never takes the other side of the trade. Your client's profit or loss has no direct effect on the broker's revenue from that trade; the broker earns the same transaction fee whether the client wins or loses.

A B-Book broker internalizes the order instead of routing it externally. The broker becomes the counterparty: when your client buys, the broker's book is short, and vice versa. If the client loses, the broker keeps the difference; if the client wins, the broker pays it out of its own balance sheet. This is often called operating as a market maker, and it is a legal, regulated way to run a brokerage in most jurisdictions — but it creates a structural conflict of interest that does not exist in a pure A-Book setup.

In practice, very few large retail brokers run a pure version of either model today. Most run a hybrid book, routing profitable or high-volume clients to external liquidity (A-Book) while retaining smaller or less experienced accounts internally (B-Book), governed by an automated risk engine that reclassifies clients as their trading behavior changes. If you are evaluating a broker for a hybrid execution partnership, ask directly how that classification works and how often accounts move between books.

Why this matters for your commissions specifically

The execution model determines which commission structures a broker can sustainably offer you, and how durable those payouts are.

• A-Book revenue share commissions are usually smaller per lot but scale predictably with real trading volume. A broker earning a fixed markup per trade has a fixed, calculable pool to share with you, so the rebate rarely changes suddenly.
• B-Book revenue share commissions can be materially higher, because the broker's revenue pool includes client losses, not just spread markup. This is why some B-Book-heavy brokers can advertise unusually generous rebates or high CPA offers relative to A-Book competitors — the economics behind the offer are different, not necessarily worse, but they depend on client turnover rather than client retention.
• Hybrid brokers typically blend the two, and your effective commission can shift over time as your referred clients get reclassified between books based on trading style.

Does a higher rebate always mean a worse deal for your clients?

Not automatically — but it does mean you should look harder. A B-Book broker with strong regulation, fast withdrawals, and no history of requoting profitable trades can be a perfectly legitimate partner; the model itself isn't the problem, unmanaged conflict of interest is. The regulated vs offshore tradeoff matters more here than the execution model alone, because a well-regulated B-Book broker operates under documented conflict-management rules, while an unregulated one has no external check on how it treats losing — or winning — accounts.

How to vet which model a broker actually runs

Brokers rarely advertise "we B-Book most of our clients" in plain language, so you need to read between a few signals.

1. Ask directly. A broker with nothing to hide will explain its execution model, including how hybrid classification works, in a straightforward conversation with your account manager.
2. Check the regulator disclosures. Regulated brokers in the UK, EU, and Australia are required to publish the percentage of retail accounts that lose money on CFDs — commonly disclosed in the 65–85% range across the industry. A broker unwilling to show this figure, or regulated in a jurisdiction that doesn't require it, is harder to evaluate.
3. Look at execution type per account tier. Some brokers openly offer separate account types — for example a raw-spread "ECN" account that is genuinely A-Booked, alongside a standard-spread account that is B-Booked. This is a legitimate and transparent hybrid structure.
4. Watch for behavior that signals internalized risk, such as requotes concentrated on winning trades, unexplained slippage against the client, or sudden payout delays after a strong month for your referred traders.
5. Read the IB agreement for any clause letting the broker unilaterally reclassify your clients' account type or reduce your commission if their trading style changes — this is often where hybrid-model risk to you shows up contractually.

A worked example

Say you refer 100 active retail clients a month to two brokers running identical spreads. Broker A runs a pure A-Book model and pays you $6 per lot regardless of outcome. Broker B runs a B-Book model and pays you $9 per lot, but its client-facing terms show wider effective spreads during volatile periods and its regulator disclosure shows 82% of retail accounts lose money — a common industry figure, not unique to this broker.

Over a full year, if your clients trade consistently, Broker A's payout is predictable and tied purely to volume. Broker B's higher headline rate depends partly on your clients continuing to lose money net, because a durable run of client profitability puts pressure on Broker B's book and, historically, is where B-Book brokers are most likely to tighten conditions, increase slippage, or reclassify accounts. Illustrative numbers only — real payouts depend on your specific traffic, broker terms, and market conditions, and no execution model guarantees any specific commission outcome.

Mistakes IBs make with A-Book vs B-Book

• Chasing the highest rebate without checking the model behind it. A large gap between two brokers' rebate sheets on similar traffic usually has a structural explanation.
• Assuming B-Book always means untrustworthy. Some of the most respected retail brokers run a well-regulated hybrid book; the presence of internalized risk is not itself disqualifying.
• Assuming A-Book always means safer for your reputation. A-Book brokers can still have poor execution, slow support, or weak payout reliability — the execution model answers one question, not every question on your due-diligence checklist.
• Not asking what happens to commission when a client's account is reclassified in a hybrid setup — this is the single most common source of unexpected payout drops IBs report.
• Sending high-skill audiences (scalpers, systematic traders) to brokers that will B-Book them by default, which often produces requotes and execution friction that damages conversion and retention regardless of the rebate.

Where this fits your broker selection process

Execution model is one input among many in the broader 40-point broker checklist — alongside regulation, payout reliability, and audience fit. It matters most when you're deciding between brokers with similar surface-level offers, because it explains why their rebate structures differ and how durable each one is likely to be.

For CPA-focused or performance-driven partners specifically, execution model interacts directly with the commission model you're negotiating — a broker's willingness to offer aggressive CPA deals often correlates with how it books client risk internally.

Once you understand a broker's execution model and how it affects durability of payout, you're better equipped to compare real offers side by side rather than headline numbers alone. Revenika's forex partner program directory lets you filter brokers by regulation, payout structure, and account type so you can weigh execution model against the rest of a broker's profile in one place, rather than piecing it together broker by broker.

Frequently Asked Questions

Is B-Book trading illegal?

No. B-Booking is a legal and regulated way to run a brokerage in most major jurisdictions, provided the broker discloses the practice appropriately and manages the resulting conflict of interest under its regulator's rules. It is a business model, not a scam by itself — the risk comes from unmanaged or undisclosed conflicts, not from the model's existence.

Can I ask a broker directly whether they A-Book or B-Book my clients?

Yes, and you should. A broker's business development or affiliate manager should be able to explain how the broker classifies and routes client orders, even if the exact detail of the risk engine is proprietary. Reluctance to answer at all is itself informative.

Do hybrid brokers pay lower commissions than pure B-Book brokers?

Not necessarily lower, but typically more variable, since your effective blended rate depends on how many of your referred clients get classified into each book over time. Ask for a breakdown of commission by account type rather than a single headline number.

Does the execution model affect how fast I get paid?

Not directly — payout speed is usually a separate operational question tied to the broker's finance department and banking relationships. However, brokers under acute strain from a heavy, undiversified B-Book position have sometimes shown payout delays during periods when client wins spike, so it is worth tracking both factors together.

Should I avoid B-Book brokers entirely as an IB?

Not necessarily. Many well-regulated, reputable brokers run B-Book or hybrid models responsibly. The more useful question is whether the specific broker discloses its model, is regulated by a credible authority, and has a track record of reliable payouts and fair execution — not which model it uses in isolation.

Conclusion

A-Book and B-Book aren't good and bad labels — they're two different ways a broker earns revenue, and each shapes the commission structures, payout durability, and execution quality you can expect as a partner. The practical move is to identify which model (or hybrid mix) a broker actually runs, weigh that against its regulatory standing and payout history, and match it to the audience you're sending — high-skill traders generally do better with genuine A-Book or ECN execution, while broader retail audiences can work well with either model under a well-regulated, transparent broker.

Further reading: the FCA's rules on conflicts of interest outline what regulated brokers must disclose and manage, and ESMA's retail CFD investor warnings explain the account-loss disclosure requirement referenced above. For a broader look at how execution and liquidity provision work mechanically, the Investopedia explainer on market makers is a solid neutral primer.