A new client wants to open a margin account and buy $3,000 of stock. The Regulation T requirement is 50%. How much must they deposit? If you immediately said "$1,500," you just fell for one of the most common judgment traps on the SIE exam. The real answer is $2,000, and understanding the "why" behind that number is the difference between a pass and a fail on the brokerage operations section.
Brokerage operations rules on the SIE exam cover anti-money laundering (AML) and credit regulation. FinCEN enforces AML rules like KYC and Customer Due Diligence (CDD), while the Federal Reserve's Regulation T governs initial margin deposits, typically 50%. However, FINRA's $2,000 minimum equity rule for new accounts overrides Reg T on smaller trades, a frequent test trap.
Key facts
- Official Body
- Financial Industry Regulatory Authority (FINRA)
- AML Regulation
- Bank Secrecy Act (BSA) of 1970
- AML Enforcement
- Financial Crimes Enforcement Network (FinCEN)
- Credit Regulation
- Federal Reserve Board's Regulation T
- Initial Margin Requirement
- 50% of purchase price (Reg T)
- New Account Minimum
- The greater of $2,000 or 100% of purchase (FINRA Rule 4210)
- CTR Threshold
- Currency transactions exceeding $10,000 in one business day
- SAR Threshold
- Suspicious activity involving at least $5,000 (with lower/no thresholds for certain activities)
The Foundation: KYC, CDD, and FinCEN Rules
The core of your firm's compliance program rests on preventing its services from being used for money laundering and terrorist financing. The SIE exam won't ask you to be a detective, but it will test if you can spot red flags and apply the correct reporting framework. These rules aren't just about paperwork; they are about actively monitoring financial behavior. You can drill these scenarios with VoraPrep's adaptive SIE practice questions to build that critical judgment.
At the heart of this is Know Your Customer (KYC), a principle codified in FINRA Rule 2090. It is the duty to use reasonable diligence to know every customer's essential facts. This means understanding their financial profile, risk tolerance, and investment objectives to ensure suitability and identify behavior that doesn't match their stated goals.
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The Customer Due Diligence (CDD) Rule, a 2018 enhancement from FinCEN, expands KYC into an ongoing process with four distinct pillars:
- Verify the identity of customers.
- Verify the identity of beneficial owners of legal entities (anyone with 25% or more ownership or significant control).
- Understand the nature and purpose of the customer relationship.
- Conduct ongoing monitoring to spot and report suspicious transactions and, on a risk-basis, maintain and update customer information.
How Firms Comply with AML Reporting
Firms meet their AML obligations, as required by FINRA Rule 3310, by developing a written AML compliance program and filing two main reports with FinCEN: Currency Transaction Reports (CTRs) and Suspicious Activity Reports (SARs).
A Currency Transaction Report (CTR) must be filed for any transaction or series of transactions involving more than $10,000 in physical currency in a single business day. The report must be filed within 15 calendar days of the transaction.
A Suspicious Activity Report (SAR) is filed when a firm knows, suspects, or has reason to suspect a transaction involves illegal funds, is designed to evade the BSA, or has no apparent business or lawful purpose. While a $5,000 transaction value is a common trigger for SARs involving potential BSA violations, a SAR must be filed for any amount if the firm suspects the activity relates to terrorism financing. The SAR must be filed within 30 calendar days of detecting the suspicious activity.
Filing a SAR is confidential. Informing the customer that a SAR has been filed is a federal offense known as "tipping off."
Finally, all firms must check new customers against the Office of Foreign Assets Control (OFAC) list of Specially Designated Nationals (SDNs). This list includes individuals and entities involved in terrorism, narcotics trafficking, and other sanctioned activities. If a match is found, the firm must reject the transaction, block the assets, and report the block to OFAC within 10 business days.
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Decoding Margin: Regulation T vs. FINRA Rules
Regulation T is a Federal Reserve rule that governs credit extended by broker-dealers for securities purchases. It establishes the initial deposit requirement when a customer buys securities on margin, but it's not the only rule you need to know.
The key number for Reg T is 50%.
A customer must deposit at least 50% of the purchase value of marginable securities. The broker-dealer can lend the other 50%. This applies to most exchange-listed stocks, closed-end funds, and ETFs. However, some instruments have different rules: purchased options and new issues (IPOs) require 100% of the premium or purchase price to be deposited. Mutual funds cannot be purchased on margin but become marginable after being held and fully paid for for 30 days.
The confusion for most candidates arises from the interplay between Reg T and FINRA's own rules.
| Rule | Who Sets It | When It Applies | Requirement |
|---|---|---|---|
| Regulation T | Federal Reserve | At time of purchase (Initial) | 50% of purchase price |
| Minimum Equity | FINRA / SRO | When opening an account | Greater of $2,000 or 100% of purchase |
| Maintenance Margin | FINRA / SRO | After purchase (Ongoing) | 25% of long market value |
The most difficult part of the SIE exam for many candidates is knowing which rule applies to the specific scenario presented. The FINRA minimum equity rule is a frequent source of errors. For an initial transaction in a new margin account, the customer must deposit the greater of the Regulation T requirement (50%) or the SRO minimum ($2,000).
There's a special carve-out: if the purchase is for less than $2,000, they must deposit 100% of the purchase price.
Walkthrough: Calculating the Margin Deposit
You calculate the required deposit by first determining the Reg T amount and the FINRA minimum, then identifying which is greater. Let's apply this judgment-first approach to two distinct scenarios that mirror what you'll see on exam day.
What is the required deposit for each client?
Step 1: Calculate the Total Purchase Value
First, find the total cost for each transaction.- Alex: 500 shares × $80/share = $40,000
- Brenda: 100 shares × $30/share = $3,000
Step 2: Calculate the Regulation T Requirement (50%)
Next, apply the 50% rule to each purchase value.- Alex: $40,000 × 50% = $20,000
- Brenda: $3,000 × 50% = $1,500
Step 3: Apply the FINRA Minimum Equity Rule
Now, compare the Reg T amount to the SRO minimum of $2,000. The customer must deposit the greater amount. This is the critical judgment step.- Alex: The Reg T requirement is $20,000. This is greater than the $2,000 FINRA minimum.
- Required Deposit for Alex: $20,000
- Brenda: The Reg T requirement is $1,500. This is less than the $2,000 FINRA minimum.
- Required Deposit for Brenda: $2,000
This is the trap. For Brenda's trade, the simple 50% calculation gives the wrong answer. The examiner is testing if you know the FINRA minimum equity rule overrides Reg T for initial purchases between $2,000 and $4,000.
What Happens if the Deposit Isn't Made?
Regulation T also specifies a payment deadline. The customer must meet the initial margin call promptly, but no later than two business days after the regular way settlement date (T+2). This means the deadline is T+4. If the customer fails to meet the call, the firm must sell out the position and freeze the account for 90 days. During a freeze, the customer can still place trades but must fully pay for them in cash upfront.
How to Build Exam-Day Judgment (Not Just Memorize Rules)
Mastering brokerage operations rules isn't about rote memorization of a list. It's about building the judgment to apply the correct rule under exam pressure. This is where VoraPrep's complete, 6-pillar course methodology stands apart from passive video lectures that cause study fatigue.
- Complete Lessons & Study Guides: We teach you the concepts with interactive lessons, not 100+ hours of talking-head videos.
- Adaptive Practice Banks: Our engine finds your specific weak spots, like the $2,000 minimum equity rule, and serves you targeted practice until you master it.
- 1:1 Exam Simulators: You'll face timed mock exams that perfectly replicate the look and feel of the real SIE test center.
- Spaced-Repetition Flashcards: We use proven memory science to help you lock in key terms and thresholds.
- Personalized Study Plan: Our platform builds a dynamic calendar around your exam date and schedule.
- Vory, Your 24/7 Tutor: If you're ever stuck, you can ask Vory for a Socratic, step-by-step explanation right inside any question.
Every one of our 1,400+ practice questions comes with a detailed rationale that explains why the right answer is right and, just as importantly, why the tempting wrong answers are wrong. This is how you learn to think like the examiner. You can see how our complete course compares to other options on our SIE comparison page.