Zillow’s New Commission Scheme Recreates the Antitrust Violation That Cost NAR $1.8 Billion

Zillow’s new product, Zillow Preview, financially incentivizes listing agents to route home sales through its own network by offering them a fixed 10 percent cut of the buyer’s agent commission—set unilaterally by Zillow—if the deal closes via its Preferred Agent program. The commission share is not negotiable. It is imposed by Zillow as a condition of accessing exclusive pre-market listings available only on Zillow and Trulia, not on competing platforms.

This structure couples buyer and seller agent compensation to access to listings, eliminating competition over commission rates. For agents, participation is effectively mandatory: Zillow controls nearly two-thirds of U.S. real estate search traffic. To reach buyers, brokers must accept Zillow’s terms. That dynamic mirrors the very commission framework the National Association of Realtors (NAR) used for decades—standardizing buyer agent pay through MLS rules, conditioning it on listing access, and suppressing price negotiation.

A federal jury found that NAR’s system artificially inflated commissions, awarding $1.8 billion in damages, with settlements ultimately exceeding $700 million. The courts ruled that when a dominant intermediary ties commission flows to listing access, it eliminates competition and raises consumer costs. Zillow Preview does the same thing, just outside the MLS. The vehicle has changed—the mechanism is now a “product” rather than a rule—but the economic effect is identical.

Launch partners include Keller Williams and HomeServices of America, both of which paid substantial settlements in the NAR litigation for participating in that price-fixing structure. Now they are enrolling in another fixed commission arrangement, this time orchestrated by Zillow. The company claims the program is voluntary, but so was NAR’s MLS access. Dominance, not formality, determines market coercion.

Zillow Preview deepens agent dependence on its platform by creating an exclusive pre-market window no rival can access. It rewards brokers for steering transactions through Zillow’s ecosystem, not because it delivers better outcomes, but because the financial incentive is baked into the platform’s terms. This is not innovation. It is re-coupling disguised as product design.

Antitrust regulators have already signaled their stance. The FTC sued Zillow in 2025 for paying Redfin $100 million to exit the rental advertising market, challenging it as an exclusionary practice. Zillow Preview replicates the same playbook: use dominance to control access, standardize payments, and condition participation on accepting non-negotiable terms. The economic substance matters more than the label.

Zillow’s CEO claims housing affordability is the crisis of our time. Yet the company is building systems that suppress competition, lock in commissions, and raise transaction costs—all while calling it consumer advocacy. The structure behind Zillow Preview recreates the anticompetitive mechanism that cost NAR $1.8 billion.