The race to zero fees for ETFs accelerated from a price‑competition phase into a structural shift by 2024–26. More issuers now offer zero‑fee or effectively zero‑fee ETFs to capture retail flows and platform shelf space. For investors the headline line is appealing: no management fee. But the apparent cost reduction masks a range of monetization strategies and trade‑offs that matter for performance, liquidity and long‑term fund survival.

How issuers actually make money on zero‑fee ETFs

Zero‑fee ETFs are not free to run. Issuers replace explicit management fees with alternative revenue streams. The dominant channels are:

  • Securities lending: Lending portfolio securities to short sellers generates income. Lenders share some of that income with the fund and keep the rest. When demand for lendable names is high — small‑cap or hard‑to‑borrow stocks, for example — lending yields can be material. But lending revenue is cyclical and concentrated in particular asset classes.
  • Trading and principal revenues: Large issuers or affiliated broker‑dealers can internalize creation/redemption flows, earn spreads by warehousing inventory, or capture arbitrage profits between primary and secondary markets.
  • Order flow and execution rebates: Although PFOF (payment for order flow) has come under scrutiny, some zero‑fee ETFs benefit from routing arrangements and exchange rebates when they are heavily traded on particular platforms.
  • Sweep and interest margins: Cash held in a fund’s cash basket, margin on collateral from lending, and float income can generate modest revenue in a higher interest‑rate environment.
  • Cross‑subsidies and customer acquisition: Issuers may use zero‑fee ETFs as loss leaders to attract retail broker relationships, steering new accounts into advisory platforms, paid products or proprietary funds.

Revenue mix differs by strategy

Revenue sources are strategy dependent. A broad U.S. large‑cap equity ETF will have limited securities‑lending income relative to a diversified international or small‑cap ETF. Fixed‑income and ultra‑short cash ETFs generate most revenue from interest and securities finance, while thematic and niche ETFs often rely on platform support or cross‑subsidy because their lendable universes and turnover make lending revenue thin.

Risks and hidden costs investors should know

Zero fee does not eliminate costs. It changes who bears them and how they show up.

  • Execution cost and tracking error: Without a fee cushion, operational frictions (spread capture, poor intraday liquidity) can increase realized tracking error. Investors who trade large blocks may face worse execution than advertised low fees suggest.
  • Revenue concentration risk: When securities‑lending or market‑making revenue collapses — for example, in a market stress episode or when lend demand drops — the economic model can break down and issuers may tighten operations or add fees.
  • Fund closure risk and tax consequences: Small zero‑fee ETFs can be closed or merged more quickly if they fail to attract scale. Forced liquidations generate realized gains or losses for holders. Investors who chase a zero fee without assessing AUM and distribution footprint risk being displaced into tax events.
  • Conflicts of interest: Cross‑subsidies and affiliated principal trading can create potential conflicts. For example, an issuer that internalizes flows may route creations in a way that benefits other proprietary desks or affiliated products.
  • Opacity of revenue streams: Unlike a charged expense ratio, many non‑fee revenues are not shown as a single line to investors. Prospectuses and annual reports disclose securities‑lending arrangements, but granular, up‑to‑date revenue splits are often not easily comparable across issuers.

Market dynamics: who can sustain zero fees?

Not every issuer can make zero fees work. Sustainable providers typically possess several attributes:

  1. Scale and distribution reach: Higher AUM increases securities‑lending pools, reduces per‑share fixed costs and supports tighter secondary market spreads.
  2. Affiliated trading and balance‑sheet capacity: Firms that can absorb temporary inventory and manage creation/redemption flows more efficiently extract trading revenues.
  3. Diverse product ecosystems: Issuers with a broad product set can cross‑sell paid services or route clients into advisory platforms to monetize the relationship.
  4. Operational sophistication: Low operational cost per creation unit, efficient lending programs and robust AP relationships make the model viable at thin or zero explicit fees.

Smaller issuers or boutique thematic sponsors without those advantages often struggle to sustain zero fees beyond an initial customer‑acquisition window unless they receive ongoing subsidies from the parent firm.

Comparing zero‑fee ETFs to low‑fee alternatives

When evaluating zero‑fee ETFs against low‑fee peers (say 2–5 bps), consider:

  • Net cost to investor: Track total cost, including realized spread, market impact and tracking error, not just expense ratio.
  • Transparency and disclosure: Low‑fee funds typically have clearer, predictable fee structures; zero‑fee models require reading securities‑lending and revenue‑sharing disclosures.
  • Liquidity profile: Look at quoted spreads, depth at top of book and the number of active authorized participants. A slightly higher expense ratio can be worth it when it comes with better liquidity and lower implementation costs for large trades.
  • Operational endurance: Assess whether the issuer can sustain the product through market cycles without abrupt closures or fee reversals.

Practical due‑diligence checklist for investors

Before allocating capital to a zero‑fee ETF, check these items:

  1. AUM and flow trends: Small, stagnant AUM increases closure risk. Prefer ETFs with consistent inflows or at least meaningful scale.
  2. Secondary market liquidity: Examine historical bid/ask spreads and depth during normal and stressed sessions. Use intraday VWAP slippage measurements for large order estimation.
  3. Securities‑lending disclosures: Review the prospectus and annual report for revenue share percentages, reinvestment of collateral and counterparty practices.
  4. Authorized participants and market‑maker breadth: A robust AP community reduces liquidity fragility and arbitrage risk.
  5. Issuer incentives: Determine whether the fund is a strategic growth initiative, loss leader or core product — and whether the issuer has the balance‑sheet capacity to support it.
  6. Historical tracking error vs. index: Compare realized tracking difference over multiple periods, not just headline returns.
  7. Clear communication of fees if changed: Check how quickly and transparently the issuer can implement new fees if the model proves unsustainable.

Outlook: Will zero fees persist?

Zero fees are unlikely to disappear. They serve powerful distribution and marketing needs for large issuers and brokers. But the structure will bifurcate:

  • Large, integrated issuers will continue to support a subset of zero‑fee ETFs where lending, trading and cross‑sell economics are favorable.
  • Smaller, niche zero‑fee entrants will either be acquired, pivot to paid products or close if they fail to scale.
  • Regulators and platforms will keep a spotlight on transparency around non‑fee revenue channels, particularly securities lending and order‑routing arrangements, which may increase required disclosures.

For investors the bottom line is straightforward: evaluate zero‑fee ETFs not by the headline expense ratio but by total implementation cost, liquidity, and the issuer’s business model. When those factors check out, a zero‑fee ETF can be an effective, low‑cost building block. When they don’t, investors may be better off paying a few basis points for a more robust, transparent product that reduces execution and closure risks.