Why Are All U.S. Stock Platforms Saying $0 Commission? What Is the Fee Structure Behind It?

The main reason everyone says $0 commission is that retail U.S. stock competition has turned trading commission (Commission) into a user-acquisition threshold: if you do not waive commission, users can be attracted to neighboring platforms. $0 commission usually means only the commission layer is $0, not that stock trading becomes completely cost-free. The underlying fee structure can be roughly split into three layers: explicit charges commonly visible on statements (platform fees, external pass-through fees, etc.), implicit costs such as execution quality and spread that are rarely emphasized in ads, and regulatory fees like Section 31 and TAF that may appear on some sell orders. Platforms still need revenue sources, so commission-free slogans and complete business structures can coexist. If you want to know whether this is an industry phenomenon or a special case on your own statement, the sections below cover causes, where money comes from, structure layers, and practical checks. Specific rules depend on your platform; this content is not investment advice.

Key Takeaways

• The prevalence of $0 commission is a competition outcome, not the disappearance of total industry fees.
• Commission-free messaging usually means commission layer is zero; fee schedules often still include other items.
• Fee structure includes explicit, implicit, and regulatory layers; ads alone are insufficient.
• Platform revenue can come from platform fees, interest, order routing, etc., varying by platform.
• Payment for order flow is legal in the U.S., but best-execution debates remain.
• Platform judgment should rely on full fee disclosures, not just commission-free slogans.

Behind $0 Commission, How Many Fee Layers Exist?

Open several U.S. broker websites and you will commonly see terms like commission-free, $0 commission, free stock trading. This is not a gimmick of a single platform, but a common pricing model under recent retail competition: push the most comparable commission layer down to zero, then cover operating costs and profit through other layers.

Industry-wide behavior does not mean your own statement is zero. At the phenomenon level, everyone advertises $0 commission; at the statement level, you still need to read fee schedules and confirmations to check whether fields like Platform and External exist beyond Commission, and whether sell-side regulatory items are listed separately.

FINRA tells investors: Zero Commissions ≠ Zero Fees. This line captures the core structure: what is waived is the commission layer, not every charge item.

Summary: Behind $0 commission there are at least four layers: commission, other explicit fees, implicit execution costs, and sell-side regulatory fees. Industry-wide commission-free messaging reflects competitive positioning, not a zero-only statement for you. In practice, check whether Platform, External, Section 31, and TAF appear in fee schedules and confirmations. Core conclusion: commission is waived, not all fee layers.

Why Did the Industry Collectively Push Trading Commission to Zero?

The core reason is retail competition: commission is the easiest metric for users to compare side by side. Platforms use commission-free pricing to acquire users, then migrate revenue to other links. This is not a one-broker promotion, but a long-running industry pricing trend.

From charging commission to acquiring users with commission-free

As online brokers became mainstream, trading commission was both the most sensitive and the easiest item for users to compare. Public sources often connect the spread of Payment for order flow with zero-commission adoption. Around 2013, some platforms entered with very low or zero commission, pushing traditional brokers to follow. Online commissions for common stocks and common ETFs gradually became $0, making commission-free closer to an industry default than a short-term promotion.

For users, perceived explicit trading cost declined; for platforms, revenue models had to shift away from per-trade commissions toward other sustainable sources. Where revenue comes from is covered in the section below on where money usually comes from behind commission-free slogans.

Summary: The root cause of collective commission-free pricing is retail competition: commission is easiest to compare, so platforms lower it to zero for acquisition and cover costs elsewhere. The trend accelerated after 2013 and became close to default for common-stock trading. For users it means lower visible commission; for platforms it means revenue-structure migration. So $0 commission is a competition outcome, not a disappearance of fees.

Behind Commission-Free Slogans, Where Does Money Usually Come From?

Commission at zero does not mean platforms do not make money. Revenue typically comes from combinations of platform/service fees, use of client funds, order routing arrangements, financing, FX spreads, and more. It varies by platform and must follow disclosures.

Relationship between PFOF and $0 commission

PFOF means a broker routes part of retail order flow to market makers/execution venues and may receive compensation. In the U.S., this arrangement is legal and highly correlated with the timeline of zero-commission adoption—it helps support economic models that do not charge traditional commissions to users.

Debate centers on potential conflict of interest: brokers owe customers a duty of reasonable best execution while potentially earning routing-related revenue. FINRA best-execution requirements are designed to constrain this tension. For readers, the key is not to label PFOF as purely good or bad, but to understand that commission-free may come with discussions on routing and execution quality, rather than a simple free lunch.

Not all platforms use the same routing model; whether and how it is involved should be checked in your platform’s disclosures.

Besides PFOF, what other common revenue sources exist?

Even without discussing routing, platforms may still generate revenue via:

• Platform or service fees: Explicitly listed in fee disclosures, charged per share, per order, or with minimums.
• Interest on client funds: Yield spread from customer cash balances, usually not shown as trading commission in the same line.
• Financing, subscriptions, FX spread: Depending on product and region.

Each item above can become part of your real cost outside the commission-free slogan.

Summary: Commission-free does not mean no platform revenue. Revenue usually comes from a combination of platform fees, interest on client funds, financing/subscriptions, FX spreads, and routing-related arrangements for some platforms. PFOF is important in the U.S. but not the only path; differences across platforms are large. For investors, the key is disclosure clarity and whether it affects execution experience and total cost.

Fee Structure Faced by Investors: Explicit, Implicit, and Regulatory

If you already trade or are preparing to trade U.S. stocks, besides whether commission is waived, it is useful to think in three layers below. $0 commission only means the commission layer is often zero; it does not remove explicit items such as platform fees or external pass-throughs, nor implicit factors like spread.

Scope: mainly retail scenarios for U.S. spot whole-share equities and common ETFs. Not covered or requires separate lookup: options, futures, margin interest, ADR-specific fees, fractional-share chapters, Hong Kong stocks, etc.

Explicit layer: charges commonly visible on confirmations

These three differ by charging party and pricing rules: commission is execution layer, platform fee is service pricing layer, external fee is mostly third-party pass-through. $0 commission in ads almost always refers to the first line; lines two and three still follow fee disclosures.

Implicit layer: parts ads usually do not emphasize

Even when Commission is $0, you may still bear:

• Bid-ask spread and where your fill price sits relative to market quotes;
• Impact of partial fills and delayed fills on larger orders;
• Execution-quality differences under different routing paths.

These costs may not appear as separate fee lines on confirmations, but they affect your perceived trading cost. A rational expectation is: commission-free reduces explicit commission, not automatically guarantees best possible execution price each time.

Regulatory layer: fees that may appear on sells

Some platforms list regulatory pass-throughs on sells separately; they are not the same concept as external fees:

From April 4, 2026 (trade date basis), Section 31 applies at roughly $20.60 per $1,000,000 notional. FINRA’s March 2026 notice sets out this adjustment schedule.

TAF is collected by FINRA; common industry disclosure is around $0.000195/share, with possible per-trade floors/caps. Brokers such as E*TRADE list TAF and Section 31 separately for sells, which helps reconciliation. Items absent in buy previews may appear on sells; do not extrapolate from buy-side experience.

Summary: Investors can view costs in three layers: explicit fields (Commission, Platform, External), implicit execution costs (spread/routing quality), and regulatory layer (sell-side items like Section 31 and TAF). $0 commission usually covers only the commission field in layer one; layers two and three do not disappear automatically. Items absent on buys may appear on sells. Separating these layers explains why real perceived costs can differ even under the same commission-free marketing.

With $0 Commission Everywhere, How Should Ordinary Investors Judge?

When everyone advertises commission-free, platform selection should compare: whether fees are clearly written, whether rules match your trading habits, and whether implicit costs are acceptable—not who claims lower commission.

Ask yourself three questions:

1. Which layer is actually waived?
2. What exists besides commission in fee disclosures?
3. Will your order size trigger platform minimums or does trading frequency amplify total cost?

You do not need to treat commission-free as a trick, nor treat every non-zero line as arbitrary charging. The key is whether ad scope aligns with fee disclosures and trade confirmations.

Summary: When commission-free messaging is everywhere, focus should shift from “whose commission is lower” to “whose rules are clearer and fit your behavior.” Three questions are enough: which layer is waived, what non-commission items remain, and whether your volume triggers minimums or cumulative-cost amplification. Check sells separately, and inspect execution/routing disclosures where available. Matching ad, disclosure, and confirmation is more robust than chasing slogans.

When Zero Commission Is Already Standard, What Is Different About BiyaPay?

When everyone marks commission layer as zero, the more meaningful comparison is often: whether execution layer is truly zero, whether other fees are clearly disclosed in advance, and whether one account can cover your asset-allocation needs—not hearing commission-free slogans again.

BiyaPay is a wallet supporting multi-asset trading: besides U.S. stocks, users can allocate Hong Kong stocks, digital assets, and more (whether activated and whether specific symbols are tradable depends on identity verification and service scope). For users who want one account for multiple asset classes while caring about U.S. execution-layer cost, operating within one wallet can reduce friction from switching platforms repeatedly; when reviewing U.S. statements, commission, platform fee, and external fee should still be analyzed separately.

On the U.S. stock side, BiyaPay discloses commission, platform fee, and external fee as separate entries:

In a market where commission-free is common, BiyaPay’s difference is not louder slogans but that while commission is $0, platform and external fees are itemized in U.S. stock fee schedule. BiyaPay U.S. stock commission is $0; platform fee, external fee, and other charges follow fee center and order-page display. Whether order routing and revenue model involve PFOF or similar arrangements should be checked in official disclosures; this article does not preset conclusions for readers.

If you already understand industry fee structure and want to feel how execution-layer $0 commission and other line items appear pre-trade, you can place a small trial order via web trading or BiyaPay App and inspect fee preview.

Summary: When commission layer is already standard, compare three things: whether execution layer is truly zero, whether other fees are clearly itemized, and whether the account structure fits your allocation needs. BiyaPay uses $0 commission plus itemized platform/external fees and separate fractional rules for easier reconciliation. The difference is transparency and auditability, not slogan strength. Even so, this is still “commission-free, not all-fee-free”; final amounts follow fee center and order pages.

FAQ

In U.S. stock $0 commission promotions, which fee item is usually being waived?

In retail U.S. stock contexts, commission-free/$0 commission usually means trading commission (Commission) is $0, not that platform fees, external fees, or sell-side regulatory pass-throughs are also zero. Which layer a slogan refers to must follow full platform fee disclosures, not ad shorthand.

After U.S. stock $0 commission, what explicit fees can still appear on statements?

Besides Commission, previews/confirmations may still include Platform and External lines; sells may additionally list Section 31 and TAF. Zero commission is not zero fee; use platform fee disclosures and trade records as authority.

What are the main implicit costs in U.S. stock trading, and can they be seen directly on statements?

Implicit costs mainly include bid-ask spread, partial fills, and execution-quality differences, which are usually not listed in one line next to commission on confirmations. $0 commission lowers explicit commission perception but does not guarantee most favorable fill every time; large orders should combine routing/execution disclosures for assessment.

Are Section 31 and TAF on U.S. sell orders part of the commission layer?

No. Both are regulatory pass-through fees and differ from Commission. Section 31 is mostly notional-based; TAF is mostly share-based with min/max limits. Whether they are listed separately depends on platform disclosure and sell preview; trade-date rules apply.

How should ordinary investors verify real fee structure after $0 commission?

First confirm whether $0 commission refers only to Commission, then read Platform and External entries, and review buy and sell previews separately. Reconcile with confirmations and check routing/best-execution disclosures where available; platform official documents prevail.

Is platform use of customer-fund interest to support $0 commission verifiable?

Interest spread on customer funds, platform fees, and routing arrangements can all contribute to platform revenue. The specific mix varies by platform. Whether PFOF is involved and how it is disclosed should be checked in your platform’s official disclosures and regulatory documents; this article does not draw a universal conclusion.

Understanding why everyone says $0 commission helps you avoid being led by slogans: competition pushed the commission layer to zero, while platforms still earn from other links; your statement may combine explicit fees, implicit costs, and regulatory pass-throughs. Next time you see a commission-free ad, ask first: which layer is waived, and where are the other layers documented? Separating industry phenomena from your own statement is usually easier than chasing the latest promotions.

If you care more about keeping execution-layer commission as low as possible while having platform/external fees clearly disclosed in advance, and potentially allocating U.S. stocks with other assets in one account, you can review BiyaPay U.S. $0 commission setup: trading commission is $0, and other fees follow the U.S. stock fee schedule. When commission-free slogans are everywhere, whether execution is truly zero and whether other items are itemized is often more meaningful than the slogan itself. You can place a small trial order on web trading or App to inspect fee preview; if you use other platforms, the same principle applies: read full fee disclosure first, then compare buy and sell sides rather than slogans.

This content introduces public market information, trading rules, and fee structures only, and does not constitute investment advice. Service availability depends on user location, identity verification results, platform rules, and applicable laws/regulations. Investing in U.S. stocks involves price volatility, liquidity, and FX risks; specific rates and fee items follow your platform’s latest fee disclosures and order/trade records.