Back to Glossary

Entry · Legal

Five Percent Rule

The five percent rule, also called the 5% policy, is a guideline from US securities regulators saying that a broker-dealer should generally not charge a markup, markdown or commission of more than about 5% on a securities trade. It aims to protect investors from excessive charges, and it works as a general guide, not as a strict limit.

From the Money Master HQ dictionary, founded by Shihan Sheriff (FCMA, VP of Finance at Nomod, CFO at Esanjo Ventures). How these definitions are written.

What it means

When a broker-dealer sells securities from its own inventory, it usually charges a markup, which is the difference between its cost and the price charged to the customer. In the opposite direction, when it buys from a customer, the equivalent is a markdown.

Where it acts as an agent for the customer, it charges a commission instead. The industry's self-regulatory body developed a guideline known as the 5% policy to help judge whether charges are reasonable.

Generally, a markup, markdown or commission above 5% on an ordinary transaction is a warning sign that regulators may view as excessive. It is a guide, not a hard cap, and the facts of each trade matter.

Several factors affect how reasonableness is judged. These include the type of security, how easy it is to buy or sell, the size of the trade, the value of any services provided and the amount of work the firm did.

A small trade in a thinly traded stock may justify a higher charge in percentage terms than a large trade in a popular stock. Because the guideline is about fairness to customers, firms must also disclose their charges and be able to justify them.

Advertising low-cost trading while charging steep markups can lead to enforcement action. Investors should check confirmations carefully, since the markup may not be shown as a separate line in the way a commission is.

The phrase five percent rule is also used in other contexts, such as personal finance rules of thumb on housing costs or withdrawal rates, so the context matters. In this entry the term refers to the broker-dealer pricing guideline.

Anyone applying it should check the latest regulatory text.

In practice

Real-world examples.

1

Example

A small broker sells 1,000 shares of a stock from its own inventory at a price 3% above the prevailing market. The charge is within the guideline and well documented, so the compliance team is comfortable.

2

Example

A customer notices on a trade confirmation that a bond was sold to him at $1,060 per $1,000 when similar bonds were quoted at $1,000. The 6% difference leads him to complain to the firm's compliance department.

3

Example

A brokerage reviews its pricing on small trades in thinly traded stocks. It documents why a charge slightly above 5% is justified for very small orders requiring extra effort, and sets a clear internal approval step for such cases.

Formula

Calculation

The markup percentage compares the price charged with the prevailing market price, which is normally based on the dealer's own cost or the current quotes. Markup (%) = (Price charged to customer - Prevailing market price) divided by Prevailing market price x 100 Worked example: a dealer buys shares at a prevailing market price of $50.00 and sells them to a customer at $51.50. Markup = $51.50 - $50.00 = $1.50 Markup % = $1.50 divided by $50.00 = 0.03, or 3.0% At 3.0% the charge is inside the 5% guideline. If the dealer had sold at $53.00, the markup would be $3.00 divided by $50.00 = 6.0%, above the guideline and likely to attract questions.

Case study

Seen in the real world.

Summit Ridge Securities is a fictional broker-dealer that sold thinly traded shares to retail clients at prices around 7% above its cost. A compliance review found that no one had checked these markups against the 5% guideline and that the charges were not explained to customers.

In this illustrative case, the firm reviewed its pricing, refunded customers the excess over a reasonable level, trained its sales team and added an automated alert for markups over 5%. Regulators noted the corrective steps. The story shows that a simple guideline, applied consistently, can prevent expensive disputes and protect clients.

Watch out

Common mistakes.

  • Treating 5% as a safe harbour. A charge below 5% can still be unreasonable in some circumstances, and one a little above can be justified with good reasons.
  • Calculating markup on the wrong base. It should be measured against the prevailing market price, not simply against the price the customer paid.
  • Thinking only commissions count. Markups and markdowns hidden in the price are covered too, so total charges to the customer matter.

Questions

People also ask.

Is the 5% policy a law?

No. It is a guideline issued by the industry's self-regulatory body, although regulators can treat charges far above it as a breach of fair dealing duties.

Does it apply to every product?

It was designed for ordinary secondary market transactions in securities, and other products or offerings can be treated differently. Check the current rules for your product.

How can an investor check the markup?

Compare the price paid with contemporaneous quotes for the same security and read the confirmation, which may disclose the markup for certain transactions.

Was this explanation helpful?

From the founder's library

Accounting Fundamentals: A Non-Finance Manager's Guide to Finance and Accounting, by Shihan Sheriff

Take it further with the book.

Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.

US$2.24US$2.99

25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.

View the book and save 25%

Related

Keep reading.

Last updated · October 8, 2026
Browse all terms →

Disclaimer

The information provided in this finance dictionary is for educational and informational purposes only. It should not be construed as financial, investment, legal, or tax advice. Always consult with a qualified professional before making any financial decisions. Money Master HQ makes no representations or warranties about the accuracy, completeness, or suitability of this information. Use of this content is at your own risk.