Churning
Churning is when a broker trades excessively in a client's account mainly to earn commissions rather than to meet the client's goals. It is a form of misconduct, and regulators look at turnover and cost ratios to detect it.
If your broker earns money every time you trade, there's a temptation to trade a lot. When that turns into constant buying and selling with no real benefit to you, it's called churning. It can quietly drain an account through commissions and taxes. This entry explains what churning is, how regulators measure it and how to protect yourself.
- Category
- Market Structure
- Reading time
- 3 min
- Also called
- Account churning, Broker churning
- Updated
Churning in plain words
Churning is a broker executing trades in a client's account mainly to generate commissions.1
It involves excessive buying and selling that isn't needed to meet the client's investment goals.1
FINRA's quantitative suitability rule requires that a series of recommended trades not be excessive when taken together.2
How to spot churning, step by step
Check activity
Many trades with little explanation.
Calculate turnover
Purchases ÷ average account value.
Calculate cost-equity
Yearly costs ÷ average equity.
Look for in-and-out trades
Quick round trips.
Compare with your goals
Long-term investors shouldn't trade constantly. See Time Horizon.
Complain if needed
To the firm and regulators. See FINRA.
Worked examples
Example 1 — Turnover ratio
Very highAn account averages $200,000; the broker buys $1.6m of securities in a year.
| Turnover | $1.6m ÷ $200k = 8× |
Turnover rate is one factor regulators use to judge excessive trading.2
Example 2 — Cost-equity ratio
20% hurdleSame account pays $40,000 in commissions and fees in a year.
| Cost-equity | $40k ÷ $200k = 20% |
The account must earn 20% just to break even — a classic sign of churning.2
Example 3 — Reasonable activity
NormalA long-term account turns over 0.3× a year with 0.5% costs.
| Turnover | 0.3× |
| Costs | 0.5% |
Modest trading aligned with goals isn't churning. See Trading Fees and Commissions.
Active trading vs churning
| Aspect | Active trading | Churning |
|---|---|---|
| Who decides | The client | Broker drives trades |
| Purpose | Client's strategy | Generate commissions |
| Fits goals | Yes | No |
| Legal | Yes | Misconduct |
Why churning matters
Protecting your account
Monitor trading and costs. See Trading Fees and Commissions.
Choosing a broker
Fee-based vs commission models. See Discount and Full-Service Brokers.
Regulatory complaints
Evidence for arbitration. See FINRA.
Fiduciary standards
Advisers' duty to clients. See Fiduciary Duty.
Advantages and disadvantages
Advantages
- Clear metrics help detect it.
- Regulators actively pursue it.
- Investors can recover losses through arbitration.
Disadvantages
- Hard to notice without checking statements.
- Losses from fees and taxes add up quickly.
- No single test defines it.
Going deeper
Read as far as you need. Each level builds on the one before it.
Commission conflict
Beginner
Churning arises because some brokers are paid per trade, creating an incentive to trade more than needed.1
No single test
Intermediate
FINRA says no single test defines excessive activity, but turnover, cost-equity ratio and in-and-out trading can show a violation.2
Control matters
Advanced
Cases usually require that the broker controlled the account, formally or in practice, by having the client follow recommendations. See Fiduciary Duty.
Common mistakes
Not reading statements
Review trades and costs monthly.
Trusting blindly
Ask why each trade was made.
Ignoring tax costs
Frequent trades create taxable gains. See Capital Gains Tax.
Waiting too long to complain
Time limits may apply.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Churning is excessive trading to earn commissions.
- It conflicts with the client's goals.
- Turnover and cost-equity ratios help detect it.
- FINRA's suitability rules prohibit it.
- Check statements regularly.
Frequently asked questions
Is churning illegal?
What turnover rate suggests churning?
How do I report churning?
Further learning
- FINRA
The regulator that polices it.
- Trading Fees and Commissions
The costs involved.
- Overtrading
The self-inflicted version.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Corporate Finance Institute. Churning (opens in a new tab) Checked .
- FINRA. Rule 2111. Suitability (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.