Many U.S. brokerages (Fidelity, Charles Schwab, Vanguard Brokerage, E*TRADE from Morgan Stanley, Interactive Brokers, and others) advertise $0 online equity commissions. That headline is real for many listed U.S. stocks and ETFs, and it is not the whole cost stack. Fees still show up as fund expense ratios, options contract charges, wire fees, paper-statement fees, advisory percentages, markups on exotic products, and drag on uninvested cash.
If you are still oriented to first principles, skim Investing basics for beginners first. Fund-level costs live in Understanding expense ratios.
The fee stack
| Cost | Where you see it | Typical beginner impact |
|---|---|---|
| Trade commission | Trade confirm | Often $0 for U.S. stocks/ETFs; still real for some OTC, bonds, broker-assisted trades |
| Expense ratio | Fund prospectus / ETF page | Ongoing % of assets (expense ratios; fee drag) |
| Bid-ask spread | Market quote | Wider on thin ETFs and individual bonds |
| Advisory / AUM fee | Wrap or robo agreement | e.g. 0.25%–1%+ per year on assets |
| Account fees | Fee schedule PDF | Inactivity (rarer now), paper statements, outgoing ACATS transfers, wires |
| Cash-sweep yield gap | Interest on uninvested cash vs a money-market fund | Opportunity cost when cash sits in a low-yield sweep |
| Load / 12b-1 (older mutual funds) | Prospectus | Avoid for new purchases when a no-load share class exists |
ETF vs mutual fund plumbing can change how spreads and premiums appear; see Index funds vs ETFs.
Worked example: “free trades” still cost 0.85%/year
Priya holds $80,000 at a brokerage:
- $70,000 in a stock ETF with a 0.03% expense ratio
- $10,000 in a popular active mutual fund with a 0.75% expense ratio
- A “guided” portfolio add-on charging 0.30% AUM on the full $80,000
- Average $5,000 sitting in a cash sweep yielding far below a Treasury money-market fund (she estimates 1.5 percentage points of yield left on the table)
Rough annual drag:
| Item | Math | ≈ Annual cost |
|---|---|---|
| ETF ER | $70k × 0.03% | $21 |
| Active fund ER | $10k × 0.75% | $75 |
| Advisory wrap | $80k × 0.30% | $240 |
| Cash yield gap | $5k × 1.5% | $75 |
| Total | ~$411 (~0.5% of $80k) |
Zero stock commissions did not make investing free. Moving the $10,000 active fund to a low-cost index share class, parking cash in a higher-yielding money-market or Treasury fund inside the same broker, and dropping an advisory wrap she does not use could cut most of that drag. Rebalancing without a wrap is DIY: Rebalancing a portfolio.
Fees that surprise people
- Options contracts: per-contract fees even when stock trades are $0
- Broker-assisted phone trades: can be tens of dollars
- Outbound account transfer (ACATS): often ~$50–$100 (sometimes reimbursed by the receiving broker)
- Mutual fund transaction fees on some no-transaction-fee (NTF) exceptions
- ADR pass-through and foreign security fees
- Margined account interest if you borrow (beginners: usually avoid—see Margin trading risks)
Account type still matters
Fees interact with taxes. High turnover in a taxable account can create distributions and capital-gains surprises even when the expense ratio looks fine (Capital gains basics, Taxable vs tax-advantaged). Retirement shells (IRA, 401(k)) have their own plan-admin fees at work; compare those separately from the brokerage retail fee schedule (Roth IRA vs 401(k)).
Compare fee schedules while you work through How to open a brokerage account checklist.
Checklist
- Download your broker’s full fee schedule PDF, not only the “$0 commissions” landing page.
- List every holding’s expense ratio; flag anything above ~0.20% unless you can explain why.
- Check whether you pay an advisory or “intelligence” wrap you forgot to cancel.
- Move long-term cash from a low-yield sweep into a money-market or Treasury fund you choose (deposit MMA vs fund: MMF vs MMA).
- Prefer broad, liquid index ETFs/funds to minimize spread and ER drag.
- Before transferring brokers, compare exit fees vs the new firm’s reimbursement offer.
Educational only. Not investment advice or a recommendation of any broker. Fee schedules change; verify current costs on your firm’s official disclosures.