Series 66 common mistakes
Series 66 · Understand the traps and how to avoid them.
Compares a taxable bond's quoted yield with a municipal bond's quoted yield directly, and/or reports a client's real return by subtracting inflation from a nominal return without first applying the client's tax bracket.
Questions quote pre-tax nominal yields while the client's goal is expressed in after-tax, today's dollars. The two quoted numbers are not on the same scale, but simple subtraction looks like it satisfies the math, so the error feels correct.
What to do instead
Force everything onto one scale before computing: taxable-equivalent yield = muni yield ÷ (1 − marginal tax rate), then compare. For purchasing power, apply tax first (return × (1 − t)) and only then divide by (1 + inflation) rather than subtracting the two rates. Write the bracket rate and inflation rate on scratch paper before touching the calculator.
Classifies economic indicators by how forward-looking the name sounds - tagging average prime rate, CPI, or consumer credit as leading, and building permits or initial jobless claims as coincident - then answers the follow-on central-bank question from that misclassification.
The exam asks for the classification and then chains it to a policy conclusion, so one mis-sort produces a second wrong answer. Prime rate and CPI are quoted constantly in the news as if they were predictive, which reinforces the error.
What to do instead
Memorize three short fixed lists. Leading: building permits, initial jobless claims, M2, stock prices, yield curve, new orders, average manufacturing hours. Coincident: industrial production, personal income, manufacturing and trade sales, nonfarm payrolls. Lagging: prime rate, CPI, inventory-to-sales ratio, average duration of unemployment, consumer credit. Rule of thumb: anything the central bank reacts to after the fact is lagging.
Assumes a bond's yield to maturity equals its coupon rate whenever the stem says 'held to maturity,' and on a premium callable bond picks the highest of current yield, YTM, and yield to call.
Coupon and YTM coincide only at par. The exam deliberately prices bonds above or below par to force a ranking, and yield to call is the figure candidates most often leave out of the comparison.
What to do instead
Anchor on price and ignore the coupon-rate distractor. Below par: YTM > current yield > coupon. Above par: YTM < current yield < coupon. For a premium bond that can be called, YTC is below YTM and is the worst case for the buyer. Compute current yield = annual coupon ÷ market price before ranking anything.
Computes option breakeven or maximum gain/loss with the premium on the wrong side - adding the premium to the strike on a long call, or crediting the premium to the buyer instead of the writer.
Breakeven moves in opposite directions for buyer and writer, and the exam reuses familiar strike prices across questions, so an inverted premium still produces an answer that 'looks' plausible.
What to do instead
Write the cash flow first: buyer pays the premium (debit), writer receives it (credit). Long call BE = strike + premium; long put BE = strike − premium; short call BE = strike + premium (max gain = premium, max loss unlimited); short put BE = strike − premium (max gain = premium, max loss = strike − premium). For spreads, net the two premiums first, then set breakeven off the net debit or net credit.
Selects the highest-return or highest-Sharpe-ratio choice for a client whose stated constraints include a short time horizon, a pending cash need, or a concentrated employer-stock position.
Return is the most visible number in the answer choices, while the binding constraint is usually buried in a single clause of the fact pattern. Performance figures pull attention away from the objective.
What to do instead
Before reading the choices, write the client's three binding constraints - time horizon, liquidity need, risk tolerance - and eliminate any choice that violates one. Only then rank the survivors on return. If the money is needed inside the horizon, principal volatility disqualifies the choice no matter how strong its ten-year record.
Uses beta where standard deviation belongs, or standard deviation where beta belongs - plugging beta into the denominator of the Sharpe ratio and standard deviation into the capital asset pricing model.
Both are volatility measures taught in the same chapter, and both appear in the same question stems. The distinction is systematic versus total risk, which is easy to blur under time pressure.
What to do instead
Two formulas, two risk inputs: Sharpe = (portfolio return − risk-free rate) ÷ standard deviation of the portfolio (total risk); CAPM required return = risk-free rate + beta × (market return − risk-free rate) (systematic risk only). Trigger words: 'diversified portfolio' or 'market risk' → beta; 'total risk,' 'volatility of returns,' 'stand-alone' → standard deviation.
Applies state registration and state filing requirements to a federal covered adviser, or swings the other way and concludes the state administrator has no authority whatsoever over a firm registered with the SEC.
Federal preemption removed state registration but not state antifraud enforcement, and the exam tests both halves of that boundary in separate questions. Candidates tend to learn one half and apply it everywhere.
What to do instead
Ask two questions in order. (1) Who registers the firm? If it is SEC-registered or federal covered, the state's role is a notice filing - but the administrator keeps full antifraud and enforcement authority. (2) Who registers the individual? Anyone who gives advice for compensation or exercises discretion over client assets registers as an investment adviser representative at the state level, even when the firm itself is federal covered.
Treats 'exempt security' and 'exempt transaction' as one concept - for example, marking a municipal bond as 'exempt from registration, therefore outside the antifraud rules,' or assuming a private placement of a nonexempt stock needs no registration simply because the buyers are sophisticated.
The Uniform Securities Act uses two separate exemption baskets with different logic, and the exam probes the distinction in both directions. A single remembered phrase ('it's exempt') gets applied to the wrong basket.
What to do instead
Ask what is exempt. The security: U.S. and municipal issues, bank and insurance company securities, listed securities, not-for-profit issues, and commercial paper meeting the statutory conditions are exempt however they are sold. The transaction: isolated nonissuer sales, unsolicited customer-order executions, limited private placements, and fiduciary or estate sales are exempt even when the security is not. Then hold two constants: an exempt security is still subject to the antifraud provisions, and registration exemptions do not limit the administrator's enforcement authority.
Treats every performance-based advisory fee as prohibited under the federal Advisers Act, or assumes that a client's large net worth by itself authorizes one.
The statute bans performance fees in general and a rule carves out 'qualified clients.' Candidates remember the ban and forget the carve-out, or remember the carve-out and forget that it has two independent qualifying tests.
What to do instead
Classify the fee before answering. Asset-based (a percentage of assets under management) is not a performance fee at all - it is permitted with disclosure. Performance-based is permitted only for a qualified client, roughly $2.2 million net worth excluding the primary residence or $1.1 million under management with the adviser, with registered investment companies and business development companies as statutory exceptions. Commissions are a broker-dealer concept. Note that the dollar thresholds are adjusted periodically.
Answers 'no violation - the client signed a written disclosure and consent' for conduct the statute prohibits outright, such as an adviser promising to reimburse a client for any market loss, or a brochure stating that the administrator has approved the offering.
Disclosure and consent are the correct answers for conflicts of interest and many affiliated transactions, so they become the default pick even where the rule names a flat prohibition that no consent can cure.
What to do instead
Keep two short lists and check the practice against both. Prohibited regardless of disclosure: guaranteeing a client against loss, stating or implying that registration means the administrator approved or recommended a security, and making an untrue statement of a material fact. Permitted only on the specific consent the rule names, at the time it names: an adviser's principal trade requires disclosure and the client's written consent before the transaction is completed. If an answer choice cites consent for an item on the first list, eliminate it.