NCFM Options Trading Strategies common mistakes
NCFM Options Trading Strategies · Understand the traps and how to avoid them.
Computing the breakeven of a long call or long put from the strike alone (e.g., calling the breakeven the strike price, or strike plus premium on a put) instead of adding the premium to a call strike and subtracting it from a put strike.
Candidates memorize 'strike plus premium' from call examples and apply it mechanically to every option, forgetting that a put gains value as the underlying falls, so its breakeven sits below the strike. Time pressure during calculation items reinforces the shortcut.
What to do instead
Before every breakeven calculation, write the payoff at expiry as an equation: for a long call, max(S−K,0)−premium=0 gives S=K+premium; for a long put, max(K−S,0)−premium=0 gives S=K−premium. Derive rather than recall, and sanity-check that a put breakeven lies below the strike and a call breakeven above it.
Treating intrinsic value and time value as interchangeable, for example stating that a deep in-the-money option has large time value or that an at-the-money option has intrinsic value equal to the premium.
The terms are introduced together and candidates conflate 'value' with 'premium'. They also forget that intrinsic value is floored at zero and that time value is simply premium minus intrinsic value, which can never be negative for a fairly priced option.
What to do instead
Use the identity premium = intrinsic + time value, with intrinsic = max(S−K,0) for calls and max(K−S,0) for puts. Practice decomposing premiums for ITM, ATM, and OTM options and note that ATM options are almost entirely time value while deep ITM options are mostly intrinsic.
Applying put-call parity with the wrong sign or omitting the present value of the strike, writing C−P = S−K instead of C−P = S−K·e^(−rT) (or S−PV(K)).
Candidates learn the parity relationship as a memorized formula without understanding the replication argument (a fiduciary call versus a protective put), so they drop the discounting or reverse the direction when the question involves dividends or a non-zero interest rate.
What to do instead
Reconstruct parity from the two portfolios: long call plus a bond equal to PV(K) equals long put plus the stock. Then rearrange symbolically each time. Always ask whether the risk-free rate and any dividend yield should appear, and check the sign by testing an extreme case such as a very high strike.
Interpreting a delta of 0.40 on a call as a 40% probability of exercise or as a fixed hedge ratio that stays constant as the underlying moves.
Delta is taught as 'shares equivalent' and as a rough probability proxy, and candidates forget that delta changes with the underlying (gamma) and with time and volatility. They also confuse delta across calls and puts without adjusting for the put's negative sign.
What to do instead
State delta's definition precisely: the change in option price per one-unit change in the underlying, and for calls approximately N(d1). Note that put delta equals call delta minus one, so it is negative. When a question asks about hedge ratios after a price move, recompute delta or apply gamma rather than reusing the original value.
Confusing the direction of vega and theta effects, claiming that a long option position benefits from time passing or that higher implied volatility hurts a long straddle.
Long options are simultaneously long vega and short theta, so candidates who memorize 'long options are good' lose track of which risk factor is which. Theta is also frequently mistaken for the option's total time value rather than its daily decay.
What to do instead
Build a sign table for each position: long call and long put have positive vega, negative theta, positive gamma. Short options reverse every sign. For any strategy question, list the net Greek signs before evaluating a scenario about volatility rising or time passing.
Describing a covered call as limiting downside risk without recognizing that the protective effect is only the premium received, and misstating the maximum loss as zero.
The word 'covered' suggests safety, and candidates assume the stock ownership eliminates loss. In reality a covered call retains nearly all of the stock's downside, offset only by the premium, while capping upside at the strike plus premium.
What to do instead
Write the covered call payoff explicitly: max(S−K,0) capped upside plus premium, with downside equal to stock loss minus premium. State maximum loss as (stock purchase price minus premium) if the stock falls to zero, and maximum gain as (K − S0) + premium. Compare it directly with a protective put to see the opposite risk profile.
Mixing up the wings and body of a butterfly or condor, or reversing which strikes are bought and sold, so the strategy is described with the wrong risk profile and the maximum profit and loss are swapped.
Butterflies and condors involve four legs with similar-sounding strike ordering, and candidates rely on pattern memory rather than constructing the payoff diagram. Long versus short versions are easily inverted under exam time pressure.
What to do instead
Draw the payoff kink by kink from the lowest strike to the highest, labeling each leg as buy or sell. For a long call butterfly, buy the low strike, sell two at the middle, buy the high; maximum profit equals the wing width minus net debit and maximum loss equals the net debit. Verify that a long butterfly profits from low volatility and a short butterfly from high volatility.
Treating a long straddle or strangle as a low-risk position and quoting maximum loss as unlimited, or assuming it profits from any large move regardless of direction without checking the breakevens.
Candidates focus on the unlimited upside of the long call leg and forget that both premiums were paid, so the position loses if the underlying stays near the strike. They also overlook that the required move must exceed the total premium paid.
What to do instead
Compute both breakevens: strike plus total premium and strike minus total premium for a straddle. State maximum loss as the total premium paid, occurring if the underlying finishes at the strike. For a strangle, use the two strikes plus and minus the net debit. Then ask whether the expected move implied by the premium is plausible.
Ignoring assignment and early-exercise mechanics, such as assuming a short American call is never assigned before expiry even when a dividend is imminent, or misidentifying which party chooses exercise.
Candidates learn the rule that early exercise of a call is generally suboptimal and over-apply it, forgetting the dividend exception. They also confuse the holder's right to exercise with the writer's obligation to be assigned.
What to do instead
Memorize the exercise decision rule: a call holder exercises early only to capture a dividend exceeding the remaining time value plus interest on the strike; a put holder may exercise early when the put is deep in the money and interest rates are high. Remember the holder exercises and the writer is assigned, and that assignment selection is random among writers.
Applying equity option margin rules incorrectly, for example treating a long option as requiring margin, or computing the requirement for a short naked call as a flat premium amount rather than a percentage of the underlying plus premium minus out-of-the-money amount.
Margin formulas are dense and candidates memorize fragments, forgetting that long options are paid in full while short options require margin, and that spread positions receive favorable treatment because the risk is defined.
What to do instead
Classify the position first: long option paid in full, short naked option requiring margin, defined-risk spread requiring only the net debit or the width of the strikes. For naked short calls, use the standard formula of a percentage of the underlying plus premium minus the out-of-the-money amount, subject to a minimum. Learn the spread rule separately, since margin equals the maximum loss.