Payment for Order Flow (PFOF)

What Is Payment for Order Flow?

Payment for order flow (PFOF) is an arrangement where retail brokerage firms receive compensation from wholesale market makers in exchange for routing customer trade orders to them. The market maker executes the orders and profits from the bid-ask spread, while the broker uses the PFOF revenue to subsidize commission-free trading for their customers.

The practice was pioneered by Bernie Madoff (before his separate fraud was discovered) and has become a central component of modern retail brokerage economics. The largest recipients of PFOF revenue include Robinhood, Charles Schwab (TD Ameritrade), and E-Trade, while Citadel Securities and Virtu Financial are the dominant wholesale market makers.

How the Economics Work

When a retail trader places an order, the broker routes it to a market maker rather than an exchange. The market maker fills the order, often at the national best bid or offer (NBBO) or better (price improvement). The market maker's profit comes from the difference between the price at which they fill the retail order and the price at which they hedge or offset the position in the broader market.

Price improvement is a key part of the PFOF value proposition. Market makers frequently fill retail orders at prices slightly better than the best exchange price, splitting some of the spread savings with the retail trader. This price improvement varies by security, order size, and market conditions.

The broker receives a small per-share payment (typically $0.001-$0.004 per share for equity orders, more for options) that aggregates to significant revenue across millions of customer orders.

The PFOF Debate

Proponents argue that PFOF has democratized investing by enabling commission-free trading, that price improvement benefits retail traders, and that the overall execution quality for retail orders is good under this model.

Critics argue that the system creates conflicts of interest, that retail traders cannot easily verify they are getting the best possible execution, and that market makers profit from retail order flow in ways that are opaque. The informational value of knowing retail order flow gives market makers an advantage that may ultimately cost retail traders more than commission-free trading saves them.

Regulatory discussion continues, with the SEC exploring reforms to the US equity market structure that could affect how retail orders are routed and executed.