Maker-Taker Model

Makers post non-marketable limit orders that rest on the order book, adding depth and liquidity. In return, they receive a rebate (e.g., $0.0020 per share) from the exchange. This negative fee incentivizes market participants to quote competitively, tightening the bid-ask spread and reducing the cost of immediacy for all traders. The rebate directly compensates the maker for the risk of being adversely selected by an informed trader.

Takers execute against resting orders using marketable orders, removing liquidity from the book. They are charged an access fee (e.g., $0.0030 per share) that is higher than the maker rebate. This fee represents the cost of immediacy. The spread between the taker fee and maker rebate constitutes the exchange's primary revenue source, creating a self-sustaining economic model that funds market operations and surveillance.

An inverted maker-taker model reverses the standard fee structure. Takers receive a rebate for removing liquidity, while makers pay a fee to post. This structure is designed to attract aggressive, high-volume order flow from retail brokerages and proprietary trading firms. Exchanges like the NYSE American and Nasdaq BX operate inverted models, creating a competitive landscape where routing decisions are driven by fee optimization rather than just quoted price.

Smart Order Routers (SORs) must integrate real-time fee schedules into their venue selection logic. A decision to route an order is not based solely on the National Best Bid and Offer (NBBO) but on the net price after fees. For example, a quote that is $0.01 worse on a high-rebate venue may yield a superior net execution price. This complexity requires SORs to solve a multi-variable optimization problem balancing price, fee, fill probability, and latency.

The model directly influences market microstructure:

• Tighter Spreads: Maker rebates incentivize competitive quoting, reducing the quoted spread.
• Increased Depth: Rebates attract more limit orders, increasing the quantity available at each price level.
• Rebate Arbitrage: High-frequency firms may engage in strategies that capture the rebate without genuine liquidity provision, a practice scrutinized by regulators.
• Access Fee Caps: In the U.S., SEC Rule 610 caps access fees at $0.0030 per share to prevent excessive costs.

The SEC's proposed Regulation NMS Rule 615 (the Access Fee Cap pilot) and the broader debate around maker-taker reflect concerns about conflicts of interest. Broker-dealers routing to venues offering the highest rebate rather than the best execution quality creates a payment for order flow (PFOF) dynamic. The EU's MiFID II regime has placed stricter limits on rebate structures, pushing European markets toward a more transparent fee model that unbundles execution from inducements.

The per-share payment a maker receives from the exchange for posting a non-marketable limit order that adds liquidity to the order book. This rebate is the economic incentive driving the maker-taker model, allowing market makers to profit from the spread even when buying and selling at the same price. Typical rebates range from $0.0020 to $0.0030 per share in US equities, though they vary by venue and volume tier. The rebate effectively subsidizes tight spreads by compensating liquidity providers for the risk of adverse selection.

• Directly offsets the cost of carrying inventory risk
• Enables payment for order flow (PFOF) arrangements
• Creates a net-positive revenue stream for high-volume market makers

The per-share charge levied on a taker who executes against a resting order and removes liquidity. This fee is the counterpart to the maker rebate and represents an explicit cost of aggressive execution. On standard US equity exchanges, taker fees typically range from $0.0025 to $0.0030 per share. The fee structure creates a natural economic friction that discourages unnecessary liquidity consumption and encourages passive order placement.

• Charged on marketable orders, market orders, and IOC orders that fill immediately
• Combined with the maker rebate, forms the exchange's captured spread
• A key input variable in smart order router venue selection logic

An exchange that reverses the standard maker-taker model by charging a fee to makers who post liquidity and paying a rebate to takers who remove it. This structure attracts aggressive, liquidity-taking flow and is favored by institutional traders seeking to capture price improvement on large orders. The BYX exchange (BATS) and Nasdaq BX are prominent examples of inverted venues in US equities.

• Maker pays a fee (e.g., $0.0018/share); taker receives a rebate (e.g., $0.0015/share)
• Attracts liquidity-seeking algorithms that prioritize speed of execution
• Often used as a tactical venue choice when rebate capture is not the primary objective

A measure of the round-trip transaction cost calculated as 2 × |Trade Price − Midpoint at Time of Trade|. Unlike the quoted spread, the effective spread captures the actual cost a trader pays, accounting for executions that occur inside the quoted spread via price improvement. In a maker-taker market, the effective spread for a taker is the quoted half-spread plus the access fee, while a maker earns the half-spread plus the rebate.

• Formula: Effective Spread = 2 × D × (Trade Price − Midpoint), where D = +1 for buys, −1 for sells
• A negative effective spread indicates price improvement
• Used as a primary metric in Transaction Cost Analysis (TCA)

A pricing structure, synonymous with the inverted venue model, where the exchange charges a fee to liquidity providers (makers) and pays a rebate to liquidity consumers (takers). This model emerged as a competitive differentiation strategy for newer exchanges seeking to attract order flow away from incumbent maker-taker venues. The take-make structure aligns with the execution objectives of institutional investors who prioritize immediacy over passive rebate capture.

• Also referred to as taker-maker or inverted pricing
• Rebates to takers can partially offset the market impact cost of large orders
• Creates complex routing decisions in smart order routers that must weigh net price against fill probability

Under SEC Rule 610 of Regulation NMS, access fees charged by US exchanges are capped at $0.0030 per share for most equities. This regulatory ceiling prevents venues from imposing excessive taker fees that would distort the national best bid and offer (NBBO) and undermine fair access. The cap applies to any fee charged for accessing a protected quotation and is a foundational constraint on maker-taker pricing design.

• Established in 2005 as part of Reg NMS
• Does not cap maker rebates, only taker access fees
• The SEC's 2023 proposed reforms (Rule 6b-1) aim to lower the cap and introduce a volume-based tiering system to reduce conflicts of interest in order routing