PFOF Explained: What Payment for Order Flow Means for Investors

Finance

Apr 6

Payment for order flow, or PFOF, is when a broker receives compensation for routing a customer’s trade to a market maker or another execution venue. It is not an investing strategy. It is a brokerage execution and revenue model. In the U.S., the practice is legal, but it sits inside best-execution duties and routing-disclosure rules. That matters because PFOF helped support commission-free trading, while also creating an obvious conflict: the venue paying the broker is not automatically the venue that gives the investor the best result.

For anyone trying to understand modern brokerage finance and investing platforms, the useful question is not just whether a broker uses PFOF. It is whether the broker discloses its routing incentives clearly, measures execution quality seriously, and passes enough value back to customers through price improvement, speed, and fill quality. Research suggests those outcomes can differ materially across brokers.

What is PFOF?

At its simplest, PFOF is a routing payment. An investor places an order through a broker, the broker decides where to send it, and a market maker or venue may pay the broker for that flow. Some market makers pay brokers for routing customer orders to them, and that those firms may “internalize” the order rather than send it to an exchange. The UK’s FCA uses a very similar definition: a broker receives payment from market makers in exchange for sending order flow to them.

That does not mean every PFOF trade is automatically worse for the investor. Market makers can sometimes execute at a price slightly better than the quoted market, which is why price improvement sits at the center of the pro-PFOF argument. But it does mean the broker has a built-in conflict to manage. UK regulators have described that conflict as clear, and FINRA has repeatedly reminded firms that payment for order flow cannot be allowed to interfere with best execution.

A visible commission of $0 also does not make trading economically free. FCA commentary warns that hidden costs can show up through poorer prices, wider spreads, or weaker competition among liquidity providers. Academic work has long made a similar point: one Journal of Financial Economics paper found that while commissions may be lower under PFOF, spreads can widen and total retail trading costs can rise once execution is included.

How PFOF works

A typical PFOF flow looks like this:

A customer places an order through a brokerage app or website.
The broker routes that order to a market center, exchange, or wholesale market maker.
The wholesaler may fill the order out of its own inventory or internalize it off-exchange, sometimes at a slightly better price than the displayed quote.
The broker may receive a payment, rebate, or other compensation for sending that order flow there, while still remaining subject to best-execution and disclosure rules.

The details vary by firm. Robinhood’s 2025 annual customer disclosure says its securities unit receives PFOF from market centers, with equity compensation generally tied to a fixed percentage of the National Best Bid and Offer (NBBO) spread and options compensation based on symbol and order size. Fidelity says it does not seek compensation from market makers for marketable equity and ETF order flow. Schwab says it receives rebates as part of common industry practice, but states that eligible rebates are not a routing consideration and that best execution takes priority.

That alone explains why “does this broker use PFOF?” is only the starting point. Different brokers disclose different models, apply them differently by asset class, and emphasize different execution-quality safeguards. For broker-specific context, Jivaro’s Robinhood, Fidelity, and Charles Schwab platform reviews are useful companion reads.

Why brokers and market makers like PFOF

For brokers, PFOF is a revenue source that can help support zero-commission trading. For wholesalers, retail flow is attractive because it is often less informed than institutional flow, which can make it profitable to internalize and earn part of the bid-ask spread. A 2025 SEC DERA working paper notes that uninformed retail order flow is especially valuable to wholesalers because of lower adverse-selection risk, which helps explain why they are willing to pay brokers for it.

But the same SEC working paper also cautions against a simplistic story that PFOF alone created free trading. It notes that the potential savings from internalization appear small relative to modern commission levels, suggesting other forces, including technology, also helped drive commissions down. In other words, PFOF may be part of the zero-commission story, but it is not the whole story.

The main tradeoff: lower visible costs vs execution quality

The strongest case for PFOF is straightforward. Investors often get zero-commission trading, and some orders receive price improvement relative to the quoted market. A market maker may be willing to execute at a better price than the publicly quoted market, and Schwab makes a similar point when describing the potential benefits of routing to liquidity providers.

The strongest case against PFOF is just as straightforward. If a broker is paid to send orders to a venue, the broker has an incentive that may not line up perfectly with the customer’s interest in the best available execution. FCA guidance says PFOF is likely to create hidden costs and distort competition. FINRA says inducements such as PFOF may not interfere with best execution, and that disclosure does not excuse weak execution quality. In practice, that means matching the displayed quote is not always enough if better prices or execution quality were reasonably available.

The most accurate conclusion is that PFOF is neither a clean win nor a clean loss. The economic value is real, but so is the conflict. What matters is how much of the benefit gets passed back to the customer, and how rigorously the broker tests that claim.

What the research says

The case that PFOF can benefit investors

Academic research in options markets shows that wholesaler competition can produce meaningful price improvement. A recent Review of Financial Studies paper finds that more than half of options trading involves orders purchased by wholesalers and that on-exchange auctions save investors more than $47 million a day through price improvement. The same paper also finds that orders executed in auctions tend to have better execution quality than orders executed in the continuous market.

That matters because it shows the pro-PFOF argument is not empty. In some market structures, wholesalers compete for order flow by improving executions rather than simply paying brokers and pocketing the rest.

The case that PFOF can raise investor costs

The academic critique is just as serious. In a Journal of Financial Economics paper, Parlour and Rajan conclude that while commissions may fall, spreads can widen, leaving retail investors with higher total trading costs once execution is included. More recent SEC-supported research also summarizes evidence that PFOF can be associated with higher spreads, weaker price improvement, and poorer price discovery when internalization becomes too dominant.

Recent empirical work adds another layer: outcomes differ by broker. A large paper by Schwarz, Barber, Huang, Jorion, and Odean found that execution prices varied significantly across brokers even for simultaneous retail market orders, and that differences in PFOF alone did not explain all of the dispersion. Bradford Levy’s randomized trial likewise found meaningful variation in price improvement across PFOF-based brokers. That is a strong warning against treating all PFOF brokers as interchangeable.

Why options deserve separate attention

PFOF is often discussed as a stock-market issue, but options may be even more important. The same Review of Financial Studies literature says PFOF is more prevalent in options than in stocks. A 2026 Review of Financial Studies paper by Ernst and Spatt argues that option-market structure can protect high PFOF by creating barriers to entry in wholesaling, which helps explain why the options debate is often sharper than the equities debate.

What regulators require in the U.S.

In the U.S., the core legal principle is best execution. FINRA Rule 5310 says firms must use reasonable diligence to find the best market so the resulting price is as favorable as possible under prevailing conditions. FINRA has also stressed that PFOF cannot interfere with that duty and that a firm cannot rely on disclosure alone if execution quality is weak.

Disclosure is the second pillar. SEC Rule 607 requires brokers to tell customers, at account opening and annually, about their policies on receiving PFOF and routing orders. SEC Rule 606 requires public quarterly reports on non-directed order routing, including the net aggregate amount of payment for order flow, fees, rebates, and the material terms that may influence routing decisions. Since July 1, 2024, FINRA has centralized access to public Rule 606(a) reports, which makes comparison easier than it used to be.

Execution-quality disclosure has also improved. In 2024, the SEC adopted amendments requiring more granular reporting, including average time to execution in milliseconds or finer, realized spread at multiple intervals, and a public summary report. That does not settle the PFOF debate, but it gives investors and researchers better tools for measuring it.

Where PFOF is banned or effectively prohibited

PFOF is not accepted everywhere. In the United Kingdom, the FCA’s position is that PFOF creates a clear conflict of interest and is generally incompatible with the inducements and best-execution rules for retail and professional client business. Across the European Union, the rules are stricter: Regulation (EU) 2024/791 prohibits investment firms acting for retail clients, and certain professional clients, from receiving payment for routing orders to a particular venue, although some member states can use a temporary exemption until June 30, 2026. For global readers, that means PFOF is mainly a U.S. market-structure issue rather than a universally accepted brokerage practice.

How the UK and EU treat PFOF

Outside the U.S., the policy direction is tougher. The UK regulator’s long-standing view is that PFOF creates a clear conflict of interest and is generally incompatible with its rules on inducements and best execution for retail and professional client business. The FCA said in 2019 that the practice had largely ceased in those segments.

The EU has now moved to an explicit prohibition. Regulation (EU) 2024/791 inserted Article 39a, which bans investment firms acting for retail and certain professional clients from receiving a fee, commission, or non-monetary benefit for routing orders to a particular venue. Member states with pre-existing domestic PFOF practice may use a temporary exemption, but the phase-out deadline is June 30, 2026.

For a global audience, that means one important thing: PFOF is not treated the same way everywhere. It is primarily a U.S. market-structure debate, while UK and EU rules are much less permissive.

How to evaluate a broker’s PFOF model

People do not need to become market-structure specialists to ask better questions. A solid five-minute review looks like this.

1. Start with the broker’s routing disclosure

Look for the firm’s order-routing page or annual disclosure. Rule 607 requires brokers to disclose their policy on receiving PFOF, and many firms summarize it in plain language.

2. Check the quarterly Rule 606 report

This is where the hard numbers live: routing destinations, net aggregate PFOF, fees, rebates, and the material aspects of the broker’s venue relationships. FINRA’s centralized 606 database has made those reports easier to find.

3. Separate stocks from options

A broker may handle equities and options very differently. Robinhood’s disclosure uses different payment formulas for stocks and options, Fidelity’s public messaging focuses on not taking marketable equity and ETF PFOF, and academic research finds material asset-class differences in execution quality and wholesaling economics.

4. Look for execution-quality evidence, not just pricing slogans

A broker saying “$0 commissions” is less informative than a broker showing price-improvement statistics, fill data, or order-routing factors. Schwab, for example, explicitly points readers to retail execution-quality statistics, and the SEC’s 2024 disclosure changes are designed to make these comparisons more useful.

5. Treat broker choice as an execution question, not just a fee question

Research suggests the same-looking retail order can get meaningfully different results at different brokers. That is why execution quality deserves as much attention as commissions. Jivaro’s broker reviews are useful here because they approach brokerages as full products, not just price tags.

FAQ

Is PFOF legal?

In the U.S., yes, provided brokers meet best-execution obligations and disclosure rules. In the UK it is effectively incompatible with retail/professional client best-execution rules, and the EU has adopted a general prohibition with limited temporary exemptions through June 30, 2026.

Does PFOF always mean worse prices?

No. Some orders receive price improvement, and options-auction research shows real investor savings in some settings. But research also shows broker-to-broker execution differences, potential conflicts, and cases where wider spreads or weaker price improvement offset visible commission savings.

Is PFOF only about stocks?

No. In fact, recent academic work suggests PFOF is even more prevalent in options, where wholesalers buy a large share of retail flow and market structure can make the economics especially attractive.

Where can readers actually check a broker’s PFOF disclosures?

Start with the broker’s order-routing disclosure or annual customer notice, then read its public Rule 606 report. Since mid-2024, FINRA has centralized public 606(a) reports to make that process easier.

Conclusion

PFOF is best understood as a tradeoff built into modern brokerage economics. It can help reduce visible trading costs and sometimes improve execution, but it also gives brokers a routing incentive that has to be watched carefully. The more useful takeaway is not that PFOF is always good or always bad. It is that execution quality, disclosure, and market structure matter more than headline commissions alone.

For readers who want to see how those differences play out at the platform level, Jivaro’s Robinhood, Fidelity, and Charles Schwab reviews are the next logical reads.

References

Investor.gov, Executing an Order.
SEC Regulation NMS Rules 606 and 607; SEC final rule, Disclosure of Order Execution Information (2024).
FINRA Rule 5310 best-execution guidance; Regulatory Notice 21-23; Rule 6151 / 606(a) reporting information.
FCA guidance on PFOF (2012) and FCA multi-firm review (2019).
Regulation (EU) 2024/791 and Council summary of the EU ban and phase-out.
Parlour & Rajan, Payment for Order Flow, *Journal of Financial Econ
Schwarz, Barber, Huang, Jorion, and Odean, The “Actual Retail Price” of Equity Trades.
Levy, Price Improvement and Payment for Order Flow: Evidence from a Randomized Controlled Trial.
Hendershott, Khan, and Riordan, options-auction evidence in The Review of Financial Studies.
Ernst & Spatt, Payment for Order Flow and Option Internalization, The Review of Financial Studies.
FCA, Guidance on the practice of ‘Payment for Order Flow’ (FG12/13)
Regulation (EU) 2024/791