A Book vs B Book Brokers Explained Simply

Written by Dominic Walsh · Published 12 Aug 2026 · Last updated 17 Aug 2026

Every retail order a broker receives goes one of two places. It leaves the building and meets a real counterparty, or it stays inside and the firm takes the other side itself.

That fork is the whole of A book vs B book brokers. The terms describe an internal routing decision, made by software, in the fraction of a second after you click.

A Book vs B Book Brokers in One Minute

Two words, two destinations. Everything else grows from where your order lands.

The A Book Passes It On

An A book order gets hedged with a liquidity provider. The broker holds a matching position on the other side, so its exposure nets to nothing.

Income then comes from the markup or the commission. Your result barely touches the firm’s result.

The B Book Keeps It

A B book order stays internal. The broker becomes your counterparty and carries the risk on its own balance sheet.

If you lose, the firm keeps the money. If you win, the firm pays out of its own pocket.

Both Happen at the Same Firm

Almost nobody runs one book only. Software sorts flow between the two, client by client and sometimes trade by trade.

So the honest question is never which type of broker you chose. It is which book your particular account sits in today.

Inside the A Book

Hedging sounds complicated and is mostly bookkeeping. Three details explain the model.

The Hedge Comes First

When your order arrives, the broker opens an equal position with a provider. Your long becomes its long upstream.

Price then moves, and both positions move together. Whatever it owes you, it collects from the provider.

Revenue Sits in the Difference

The firm buys liquidity slightly cheaper than it sells it. That gap, or an explicit commission, becomes the income.

Volume drives everything here. More lots mean more revenue, whatever direction those lots take.

Costs Make This Model Fussy

Hedging every small trade costs money in fees and infrastructure. Tiny positions often cost more to pass out than they earn.

That economic reality, rather than any conspiracy, explains why small accounts frequently sit elsewhere.

Inside the B Book

Internalisation carries a bad reputation and a boring mechanism. Three details again.

The Broker Becomes the Counterparty

No hedge goes out. The firm records your trade and accepts the exposure directly.

Your contract now sits with the company holding your deposit. Our guide to how forex brokers work covers what that means for the balance sheet.

Client Positions Net Against Each Other

Longs and shorts cancel across a large client base. The firm carries only the leftover difference.

A big book nets efficiently and behaves almost like a fee business. A small book cannot, so its exposure grows quickly.

Risk Limits Sit on Top

Every internal book runs limits. Once exposure passes a threshold, the firm hedges the excess externally.

So the two models blend at the edges. A single account can sit internal today and get hedged tomorrow.

How a Broker Decides Which Book

Sorting happens automatically, using rules the firm writes in advance. Five inputs do most of the work.

1. Account history. Software scores whether an account has taken money out of the book over time.
2. Position size. Larger orders reach hedging thresholds sooner than small ones.
3. Instrument. Liquid majors hedge cheaply, while exotics and metals cost more to pass on.
4. Trading style. Very short holding times and news-driven entries often route differently.
5. Net book exposure. If the house already leans one way, new orders on that side go out.

Nobody Watches Individual Trades

People imagine a dealer studying their chart. In reality a rules engine sorts thousands of accounts per second.

The rules get reviewed periodically by risk staff. Your specific entry never gets a human glance.

Classification Changes Over Time

An account can move between books as its record changes. A run of profitable months shifts the score.

Nothing gets announced when it happens. You simply notice execution feeling slightly different.

Hybrid Routing in Practice

Hybrid is the normal case, not the exception. The panel below shows the sorting step.

Two Groups, One Platform

Clients get tagged into groups inside the platform’s back end. Each group carries its own routing rule and often its own pricing.

The trading terminal looks identical either way. Nothing on your screen names the group.

Why Firms Sort at All

Hedging costs money, and most retail flow nets out cheaply in house. Sorting keeps the cost of servicing small accounts sustainable.

Regulators generally permit the arrangement with disclosure. Client agreements usually state that the firm may act as principal.

What Sorting Does Not Do

Routing cannot change the market price you see. The quote comes from the aggregated feed either way.

It also cannot invent liquidity during thin minutes. Both books meet the same empty market.

Sorting changes who carries your risk, and nothing else. So it belongs on the broker’s side of the wall, not on your chart.

That is worth repeating, because most online arguments blur the two. Your fill comes from the market, while the book comes from a rule.

The Two Books Side by Side

Setting the models next to each other removes most of the confusion. The comparison below covers what actually differs.

What Changes for the Firm

One model earns from volume and holds no view. The other earns from the book and carries real risk.

Capital requirements differ as a result. Supervisors ask harder questions of a firm holding client exposure.

What Changes for You

Honestly, less than forum threads suggest. Price comes from the same feed, and your stop still becomes a market order.

What changes is the incentive behind any grey-area decision. That is worth knowing, and it is not the same as an accusation.

What Each Model Needs to Survive

Business models reveal themselves through what keeps them alive. Two very different requirements.

One Needs Volume

A hedged book earns a thin slice of every lot. Survival depends on turnover and on keeping clients trading for years.

That points the firm towards education, tools and service. A client who quits earns nothing.

One Needs a Losing Aggregate

An internal book earns when clients lose in total. Most retail books do, which is why the model persists.

Say that plainly rather than dressing it up. It explains marketing that pushes leverage, frequency and large position sizes.

Both Need You to Stay

Neither model profits from an account that blows up in a month. Acquisition costs are high, and a dead account earns nothing at all.

So the shared incentive is longevity. That partial alignment matters more than most articles admit.

Why the B Book Is Not Automatically a Scam

The internal model attracts accusations that the mechanism does not support. Three corrections.

Regulators Permit It

Major supervisors allow principal dealing with disclosure. The arrangement appears in client agreements at large, well-known firms.

Our guide to a regulated forex broker covers what the licence actually promises.

Netting Removes Most of the Bet

A large client base cancels itself out to a great extent. The firm ends up managing a residual rather than betting against everyone.

Small firms without that scale carry more genuine exposure. Size changes the picture considerably.

Manipulation Costs More Than It Earns

A licensed firm risks its permissions, its banking and its audit trail by tampering with fills. The upside on one retail stop is trivial by comparison.

That calculation protects clients better than any marketing promise. It also collapses when a firm has no licence to lose.

Where the Real Risks Sit

Worry about the right things. Three of them are worth your attention.

Weak or Absent Regulation

An internal book under a strong licence sits inside capital rules, segregation and complaints routes. The same book offshore sits inside none of them.

That gap dwarfs the routing question entirely. Check the entity before anything else.

Counterparty Failure

If your broker holds the other side and then fails, your open positions and balance meet its creditors. Segregation and compensation schemes exist for exactly this.

Our note on negative balance protection covers the related protection during violent moves.

Terms That Change Quietly

Watch for altered leverage, new restrictions or unexplained delays after a profitable month. Patterns like that matter far more than a single bad fill.

Keep tickets, screenshots and dates. Evidence gives a complaint somewhere to go.

What This Means for Your Trading

Three practical consequences, and no dramatic ones.

Your Method Still Does the Work

Neither book decides whether your entries have an edge. Routing shifts costs at the margin and nothing more.

Traders who switch firms hoping for different outcomes usually find the same results with new branding.

Execution Deserves Measurement

Log the screen price, the fill price and the conditions for a month. Then read the record instead of guessing.

Our trade journal tool gives that logging somewhere to live.

Size Protects You From Everything

Small position sizes survive bad fills, wide spreads and thin markets. Large ones do not, whatever route the order takes.

That single habit outranks every broker debate on the internet. It also works at any firm, under any licence, in any market.

Pick a risk figure per trade and hold it for a quarter. Then judge the broker, because the noise from your own sizing has gone.

How to Work Out Which Book You Are In

You cannot prove it, and four checks still tell you a great deal.

Read the Client Agreement

Look for a line saying the firm may act as principal or as counterparty. Its presence tells you the internal book exists.

Almost every retail agreement contains it. Absence of the clause would be the surprise.

Look at Your Account Type

Commission-based raw accounts route out more often. All-in spread accounts with tiny minimums usually do not.

Our comparison of ECN broker vs market maker sets those account styles against each other.

Watch the Execution Type

Requotes only appear on instant execution accounts, which points towards a quoting model. Our note on instant vs market execution explains the difference.

Ask One Direct Question

Send support a single sentence: does my account get internalised, and under what conditions? A clear answer helps, and an evasive one helps more.

Where the Two Terms Came From

The vocabulary arrived from bookmaking and stuck. A little background explains why it sounds sinister.

Borrowed From Betting

Old-style bookmakers passed big bets to other firms. They kept the small ones and hoped the numbers worked out.

Passing risk on became the A book. Keeping it became the B book. Retail forex took the habit and the words with it.

Why Retail Forex Took It Up

Bank market trade sizes sit far above what a private trader can fund. Somebody had to break those sizes down.

Brokers stepped in. They wrote smaller contracts and carried the risk. Without that step, retail access would barely exist at all.

How the Rules Caught Up

Rule makers then stepped in. Firms must now say what role they play. They must also hold money against the risk they keep.

So the habit moved out of the shadows. That shift matters far more than the label.

Leverage, Margin and the Internal Book

Leverage links directly to routing economics. Three connections worth seeing.

High Leverage Raises Turnover

A small deposit can control a large trade. That means more lots, and faster outcomes.

Both books earn more when turnover rises. One earns fees, and the other earns the net client result. So both like a high cap.

Caps Change the Business

Rules in Europe, the United Kingdom and Australia cap retail leverage hard. Trades get smaller, and accounts last longer.

Offshore firms advertise much bigger numbers. That gap is a business choice sold as a perk.

Margin Sits With the Broker Either Way

Your margin sits with the firm whichever book holds the trade. Rules on client money, not routing, decide how safe it is.

Check the licence before you check the leverage. One keeps your balance safe, and the other just flatters it.

A Simple Way to Picture It

Drop the jargon and the whole thing gets easy. Think of two shops.

The First Shop

You order a coat. The shop has none in stock. So it buys one from a supplier and hands it to you.

The shop keeps a small slice of the price. Whether you like the coat or not, its slice stays the same.

That shop runs an A book. It never owns the coat for long.

The Second Shop

You order the same coat. This shop keeps a full rack of them.

It sells you one from stock. Now the shop carries the risk that fashion turns and the rack loses value.

That shop runs a B book. It owns the goods, so it wins or loses with them.

Neither Shop Is Cheating

Both shops sell you a coat at the market price. Both must follow trading law and treat you fairly.

One simply carries stock and the other does not. Ask which shop you walked into, then check that the shop has a licence.

Quick Reference

Keep this beside the client agreement while you read it.

Question	A book	B book
Where does the order go?	Hedged with a provider	Held on the broker’s book
Who is your counterparty?	A bank or fund upstream	The broker itself
Main revenue line	Markup or commission per lot	Client losses in aggregate
What the firm needs	Turnover	A losing aggregate book
Typical account style	Raw spread plus commission	All-in spread, low minimum
Capital requirement	Lower, exposure is netted out	Higher, exposure is retained
Can you verify it?	No, only infer it	No, only infer it

Myths Worth Dropping

Three claims dominate the forums. None of them holds up.

My Broker Hunts My Stops

Stops cluster at obvious levels, so price accelerates through those levels. The same pattern appears on exchange-traded futures with no broker involved.

Wider stops and smaller size change your experience of it. A new firm usually does not.

Winning Traders Get Moved and Punished

Consistently profitable accounts often do get routed out, because hedging them is cheaper than carrying them. That is a routing change, not a penalty.

Reports of restricted accounts do exist, and they cluster around firms with weak supervision. Licence quality predicts that far better than routing does.

An Honest Broker Runs No Internal Book

Almost every retail firm runs one, including household names under strong licences. Judge disclosure, licence and behaviour instead.

Browse our MetaTrader indicators library if you would rather spend the energy on the chart, which is where results actually come from.

FAQ

Is the B book illegal?

No. Acting as principal to client trades is a licensed activity in the United Kingdom, Europe, Australia and the United States, subject to disclosure and capital rules. The client agreement normally states the arrangement plainly, and regulators supervise it precisely because the conflict exists.

Can I choose which book my orders go to?

Not directly. You can influence it by choosing an account type that routes out more often, usually a commission-based raw account with a higher minimum. The final decision still belongs to the firm’s rules engine, and it can change as your record changes.

Does the B book mean my broker sees my stop loss?

Your platform sends pending orders to the server, so the firm’s systems hold them either way. That applies under both models and under most execution styles. What matters is whether the firm acts on that information improperly, which is a supervision question rather than a routing one.

Do profitable traders get moved to the A book?

Often yes, because hedging a consistently profitable account costs the firm less than carrying it. The change happens quietly and usually shows up as slightly different execution. It is an economic decision, not a reward or a punishment.

Which model gives better fills?

Neither, reliably. Both models quote from the same aggregated feed, and both meet the same thin market during releases. Measure your own fills over a month rather than trusting a claim in either direction.

Why do small accounts usually sit internally?

Because hedging a very small position costs more in fees and infrastructure than the trade earns. Internalising that flow keeps low-minimum accounts economically viable. It also explains why raw-pricing accounts set higher deposit thresholds.

Does routing affect my swap or commission?

Not directly. Financing rates and commissions come from the account type and the broker’s pricing schedule rather than from the book your orders sit in. Compare those two lines on the specification page, since they shape the annual bill more than routing does.

Can one trade sit in both books?

Yes, in effect. A firm can keep part of the exposure in house and hedge the rest once a limit is reached. Your ticket looks the same either way, since the split happens on the broker’s side of the wall and never on yours.

Do demo accounts sit in a book at all?

No. A demo trade goes nowhere, because nothing gets hedged and no money changes hands. That is one reason demo fills often look cleaner than live ones, and why a strategy should meet a small live account before anyone trusts it.

How do I protect myself either way?

Check the licence on the regulator’s own register, read the client agreement, keep positions small enough to survive a bad fill, and withdraw regularly rather than letting a balance build. Those four habits protect you under any routing model.

Should I leave a broker that runs an internal book?

Not on that basis alone, since almost every retail firm runs one. Leave if the licence is weak or absent, if withdrawals get delayed without explanation, if terms change after profitable months, or if your own records show one-sided execution across many trades. Those are behaviours you can evidence, unlike routing, which you cannot. Results are not guaranteed; past performance is not indicative of future results.