Payment for Order Flow (PFOF) Explained: Why the UK, EU and US Disagree

Payment for order flow, or PFOF, is the practice of a broker routing its customers' orders to a particular market maker in exchange for a payment, rather than sending the order straight to a public exchange. It's the economic engine behind "commission-free" retail trading apps — the broker isn't charging the customer directly, it's being paid by the market maker for the right to execute the order instead. As of mid-2026, the three biggest regulatory regimes have landed in three different places on whether that's acceptable, which makes PFOF a genuinely live regulatory story rather than settled market practice.

How PFOF actually works

When a retail investor places an order through a commission-free broker, that broker typically doesn't send it to a public exchange at all. Instead it routes the order to a wholesale market maker — a small number of large firms that specialise in filling retail orders — which pays the broker for that order flow and then executes the trade itself, usually at or slightly better than the public market's best bid or offer. The broker earns PFOF revenue on every order; the market maker earns the spread between what it pays to fill the order and what it can do with the resulting position. Brokers are required to seek "best execution" for clients regardless of PFOF arrangements, and in the US must publicly disclose order routing practices and PFOF revenue under SEC Rules 606 and 607 — though critics have long argued that disclosure alone doesn't resolve the underlying conflict of interest, since the broker is financially incentivised to route to whichever market maker pays the most rather than whichever genuinely offers the client the best fill. This is exactly the same conflict-of-interest concern covered in our explainer on best execution and order handling, applied specifically to the PFOF business model.

Three regulators, three different answers

The United Kingdom has effectively banned PFOF since 2012, through FCA inducement rules and best-execution requirements that predate the EU's own formal prohibition by more than a decade. The European Union banned PFOF outright under Article 39a of MiFIR starting in 2024, treating it as a conflict of interest that no amount of disclosure can cure — though Germany negotiated a transitional carve-out, notified to ESMA by September 2024, that let German neobrokers keep receiving PFOF from domestic clients until 30 June 2026. When that carve-out expired, the EU-wide ban became genuinely uniform for the first time, forcing a wave of adjustment: Scalable Capital introduced a €2.99 monthly subscription to replace lost PFOF income, Smartbroker confirmed it would stop receiving PFOF payments entirely, and Trade Republic absorbed a comparatively modest hit since PFOF represented under 30% of its total revenue. The United States, by contrast, still permits PFOF under the SEC 606/607 disclosure regime — the SEC has instead relied on enforcement against misleading disclosure, most notably a $65 million fine against Robinhood Financial in December 2020 over how it described its PFOF arrangements to customers.

Why this keeps resurfacing as a policy question

The core tension regulators keep circling back to is simple to state: PFOF is what makes commission-free retail trading commercially viable, but it also creates a direct financial incentive for brokers to route order flow somewhere other than wherever genuinely offers the client the best price. The UK and EU have concluded that disclosure can't fully resolve that conflict and banned the practice outright; the US has concluded that transparency plus enforcement against misleading claims is the better trade-off, preserving zero-commission trading as a consumer benefit. Both positions have genuine trade-offs — an outright ban removes the conflict but risks pushing retail trading costs back up, while a disclosure-based regime keeps costs low but depends on investors (and regulators) actually scrutinising routing quality rather than taking "commission-free" at face value.

FAQ

If PFOF is banned, do UK and EU retail investors pay more to trade?
Often somewhat more in explicit fees, yes — the Scalable Capital and Smartbroker examples above show brokers introducing subscription fees or other charges to replace lost PFOF revenue once the practice was banned.

Does PFOF mean my order gets a worse price?
Not necessarily and not automatically — US market makers that buy order flow are still required to meet best-execution obligations and frequently execute at prices at least as good as the public NBBO. The concern is more about the structural incentive than every individual trade being disadvantaged.

Is PFOF the same thing as a dark pool?
No, though they're often discussed together as two forms of off-exchange market structure. PFOF describes a payment relationship for routing retail order flow to a market maker; see our explainer on dark pools for how the separate, largely institutional practice of trading in private venues actually works.

Does a PFOF ban affect institutional trading too?
Not directly — PFOF is specifically a retail order-flow arrangement. Institutional orders are typically large enough that market impact, not a small per-order rebate, is the dominant cost consideration, which is why institutions are far more likely to route through a dark pool or work an order through an algorithm than to be part of a PFOF arrangement at all.

Keeping up with market-structure regulation like this is part of staying current as a finance professional — see Learnsignal's CPD courses for structured ways to build that knowledge.