House Rules
What Are House Rules?
House rules are the specific internal policies and risk management guidelines set by a brokerage firm that may be stricter than regulatory requirements to protect the firm and its clients.
In the trading world, "house rules" refer to the terms and conditions established by a specific brokerage firm (the "house") that govern client accounts. While all brokers must comply with federal laws and exchange regulations (like those from the SEC and FINRA), they are free to establish their own, stricter policies. These rules are designed primarily to manage the firm's financial risk and operational efficiency. Just as a casino has house rules that dictate how games are played beyond the basic laws of gambling, a brokerage has house rules that dictate how you can trade. These rules are outlined in the margin agreement and customer account agreement that you sign when opening an account. They cover a wide range of activities, from margin requirements and short selling to day trading and options permissions. The most common application of house rules is in margin lending. While regulators say you need 25% equity to hold a position, a broker's house rule might demand 30%, 50%, or even 100% for certain risky stocks. This "house requirement" is the broker's way of saying, "We don't trust this stock, so we won't lend you as much money against it."
Key Takeaways
- House rules are set by the brokerage firm, not by the SEC or FINRA.
- They often include higher margin requirements for volatile stocks.
- House rules may limit the size of positions (concentration limits).
- They can restrict trading in certain securities, such as penny stocks or newly listed IPOs.
- Brokers can change house rules at any time without prior notice.
- Violating house rules can lead to trade restrictions or forced liquidation.
How House Rules Work
House rules are dynamic. A brokerage's risk management algorithm monitors market conditions and client portfolios in real-time. If a specific sector becomes highly volatile (like meme stocks or crypto-related equities), the firm may suddenly change the house rules for those stocks. For example, on a normal day, Stock A might have a 30% margin requirement. If Stock A suddenly jumps 200% in volatility, the broker might update the house rule to require 100% margin (meaning you must pay cash for the full amount and cannot borrow against it). This change takes effect immediately. House rules also apply to trading behavior. A broker might have a rule that prevents you from putting more than 50% of your account value into a single small-cap stock (a "concentration limit"). If you try to place a trade that violates this rule, the platform will simply reject the order. These rules act as automated safeguards to prevent clients from taking on excessive risk that could threaten the broker's capital.
Common Types of House Rules
Higher Margin Requirements: The most frequent rule. Brokers publish lists of "special margin requirements" for stocks that are considered higher risk than the general market. Short Selling Restrictions: A broker may have a "hard-to-borrow" list. Even if a stock is technically shortable, the house rule might be that they simply won't facilitate shorts on that name due to lack of inventory or high risk of a short squeeze. Pattern Day Trading: While FINRA defines a Pattern Day Trader (PDT) as someone who executes 4 day trades in 5 days, a broker might have stricter house rules, perhaps flagging accounts with fewer trades or requiring a higher minimum balance than the $25,000 regulatory standard. Option Limits: Brokers assign "option levels" to clients. House rules determine who qualifies for Level 4 (selling naked calls) vs. Level 1 (covered calls), often based on strict criteria of net worth and experience.
Important Considerations for Traders
Traders often feel frustrated by house rules, viewing them as arbitrary restrictions that hinder their strategy. However, these rules are crucial for the solvency of the brokerage. If a broker allowed every client to max out leverage on a crashing stock, the clients would go bust, and the broker would be left with bad debt, potentially endangering other clients' assets. The key takeaway is that the broker has the final say. You cannot argue with a house rule by citing federal regulations. If the broker says the margin requirement is 50%, it is 50%, even if FINRA says 25%. Traders should always check the "marginability" of a stock before trading it to avoid surprises.
Real-World Example: "Meme Stock" Restrictions
During the GameStop (GME) trading frenzy of 2021, several brokerages implemented strict house rules.
FAQs
They are outlined in the margin agreement and customer account agreement. Specific margin rates for individual stocks are usually available on the broker's website or trading platform.
Yes. Most agreements state that the broker can modify requirements at any time without prior notice based on market conditions.
Penny stocks are highly volatile and illiquid. The "house rule" of 100% margin protects the broker from the risk that the stock price falls to zero and you cannot repay the loan.
Yes, different brokers have different risk tolerances. A conservative bank-owned broker might have stricter house rules than a specialized day-trading firm. However, all must meet the regulatory minimums.
A house call is a specific type of margin call triggered by the broker's internal rule, whereas a "maintenance call" usually refers to the regulatory minimum. Both require you to add funds or sell assets.
The Bottom Line
House rules are the specific terms of engagement set by your brokerage. They represent the firm's risk appetite and operational policies. While regulatory rules provide a baseline for market safety, house rules provide the buffer that keeps individual firms solvent during stress. For a trader, knowing your broker's house rules—especially regarding margin maintenance and concentration limits—is just as important as knowing the market regulations. Always assume that the broker has the right to be stricter than the law requires and manage your risk accordingly. In times of market chaos, these rules are the first line of defense; ignoring them can lead to restricted trading privileges or forced liquidations. Ultimately, house rules are not just bureaucratic red tape; they are essential mechanisms for maintaining the stability of the financial ecosystem.
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Key Takeaways
- House rules are set by the brokerage firm, not by the SEC or FINRA.
- They often include higher margin requirements for volatile stocks.
- House rules may limit the size of positions (concentration limits).
- They can restrict trading in certain securities, such as penny stocks or newly listed IPOs.