Options, end to end — contracts that convert probability into profit

Calls & puts, in one paragraph

A call gives you the right to buy at the strike price. You want the stock up. A put gives you the right to sell at the strike price. You want the stock down. Buyers of options pay premium and have capped risk (the premium). Sellers collect premium and take on open-ended obligations if they're not hedged.

Why options exist

• Leverage — control 100 shares for a fraction of the capital.
• Hedging — insure a long stock position against a drop with puts.
• Income — sell premium against positions you already own or want to own.
• Defined risk — buy a call or a spread and know your max loss at order entry.
• Volatility exposure — trade the expected range of a stock without taking a side.

Stocks vs. options at a glance

A quick mental model

Think of a call like a down payment on a house. You pay a small amount now to lock in the right to buy later at today's price. If the market price goes up, your contract is worth more. If it goes down, you walk away and only lose the deposit. Options behave the same way — they're conditional rights with an expiration date.

The four parts of any contract

• Underlying — the stock, ETF, or index the option is written on (AAPL, SPY, QQQ).
• Strike price — the price at which the option can be exercised.
• Expiration date — the day the contract dies.
• Type — call (right to buy) or put (right to sell).

A contract written as AAPL 210C 2026-05-15 means: AAPL call, strike 210, expires May 15 2026.

Reading the option chain

An option chain is a grid: rows are strikes, columns are fields. Standard columns:

Expirations: weeklies, monthlies, LEAPS

• 0DTE / weeklies — expire same day through Friday. Huge gamma, huge theta, ruthless.
• Monthlies — third Friday of each month. The original standard, deepest liquidity.
• Quarterlies — end-of-quarter expirations for index products.
• LEAPS — Long-term Equity Anticipation Securities, one to three years out. Closer in behavior to stock than short-dated options.

Exercise, assignment & settlement

Exercise = the buyer uses their right. Assignment = the seller gets pulled into the obligation. Most retail options are never exercised — they're closed out for the difference in premium. Two settlement types to know:

• American-style — can be exercised any day before expiration. All US equity options.
• European-style — exercise only at expiration. SPX, NDX, VIX index options.

Intrinsic value

The real, already-earned piece. For a call: max(0, stock − strike). For a put: max(0, strike − stock). If AAPL trades at $215 and you own a $210 call, intrinsic value is $5 (×100 = $500 per contract). It cannot be negative.

Extrinsic value

Everything above intrinsic. It's what you pay for time remaining and uncertainty. Extrinsic value is what decays away as expiration approaches. At expiration, extrinsic = 0; only intrinsic remains. This is why holding long options into expiration is usually a losing game unless you're deep ITM.

Moneyness

ATM options have the most extrinsic value and the most time decay. OTM options are cheaper but need a move to become profitable. ITM options behave more like stock.

Break-even math

• Long call break-even = strike + premium paid.
• Long put break-even = strike − premium paid.
• Short call break-even = strike + premium received.
• Short put break-even = strike − premium received.

A $210 call bought for $3 needs AAPL above $213 at expiration just to avoid a loss. The stock moving in your direction isn't enough — it has to move more than the premium you paid.

Delta — direction & probability

Delta measures how much the option price changes per $1 move in the underlying. Calls have positive delta (0 to 1), puts have negative delta (0 to −1). ATM options have delta near 0.50.

Useful shortcut: delta ≈ the market-implied probability that the option finishes ITM. A 0.20 delta call has roughly a 20% chance of expiring ITM. This is not a formal probability, but it's a fast, practical intuition.

Gamma — the rate of change of delta

Gamma tells you how quickly delta moves as the stock moves. Gamma is highest for ATM options near expiration and lowest for far OTM/ITM or long-dated options. This is why 0DTE options feel insane — a small move in SPX flips a 0.10 delta put to 0.60 in minutes. Gamma is the reason sellers of short-dated options can get blown up by a single news event.

Theta — time decay

Theta is the dollar amount the option loses per day, all else equal. Long options = negative theta (you pay rent). Short options = positive theta (you collect rent). Theta accelerates non-linearly — the last two weeks to expiration hemorrhage value on ATM options.

Vega — volatility sensitivity

Vega is how much the option changes per 1% change in implied volatility. Long options = positive vega (you profit when IV rises). Short options = negative vega (you profit when IV falls). Vega is largest on longer-dated options — it's why LEAPS feel more like stock with a vol overlay than traditional options.

Rho — interest rate sensitivity

Rho measures sensitivity to interest rate changes. For most retail traders on short-dated options, rho is noise. It matters for LEAPS and for arbitrage desks; don't let it distract you from the four Greeks that actually drive your P&L.

Greeks cheat sheet

Historical vs. implied

Historical volatility (HV) is what the stock actually did — backward-looking. Implied volatility (IV) is what options prices say the market expects — forward-looking. When IV > HV, options are relatively expensive. When IV < HV, options are relatively cheap.

IV Rank & IV Percentile

Raw IV numbers mean nothing without context. An IV of 40% is cheap for TSLA, expensive for KO. Normalize with:

• IV Rank — where current IV sits between the 52-week high and low. IV Rank of 70 means we're closer to the high than the low.
• IV Percentile — % of trading days in the past year IV was below today's level.

Premium sellers want high IV Rank (> 50). Buyers want low IV Rank (< 30).

The volatility crush

Before an earnings report, IV swells as the market prices in uncertainty. Immediately after the release, IV collapses — sometimes by half — because the uncertainty is resolved. This is the "vol crush." A trader who bought a call before earnings can see the stock move in their direction and still lose because the vol crush overwhelmed the delta move.

The volatility smile / skew

If you chart IV across strikes of the same expiration, you don't get a flat line. OTM puts almost always carry higher IV than ATM or OTM calls — the "put skew" — because the market pays up for crash protection. Recognizing skew is how you pick strikes intelligently.

Expected move

The options market prices an expected move for every expiration. Rough formula: stock price × IV × sqrt(days / 365). Or simpler: use the ATM straddle price × 0.85 as the expected 1-standard-deviation move to expiration. If SPX straddle says ±100 over the next two weeks, that's a range you can build strategies around.

Long call

Thesis: stock goes up, fast enough to beat theta. Max loss: premium paid. Max gain: unlimited. Break-even: strike + premium.

When to use: directional bullish bet with defined risk, leverage. Best when IV Rank is low and a catalyst is expected. Avoid near earnings unless you understand the vol crush.

Long put

Thesis: stock goes down, or hedge against a long equity position. Max loss: premium paid. Max gain: strike − premium (to zero).

When to use: bearish directional bet; portfolio insurance. Put skew makes them structurally pricier than calls — account for that.

Covered call

Position: own 100 shares, sell 1 call against them. Thesis: stock trades sideways or slowly up. Max gain: premium + gains to strike. Max loss: downside on the stock offset by the premium collected.

The most popular income strategy on earth. Works beautifully on long-term holdings in a boring tape. Downside: you cap your upside in exchange for the premium.

Cash-secured put

Position: sell a put, hold cash to cover assignment. Thesis: you want to own the stock at a lower price, and you're happy to be paid to wait. Max gain: premium collected. Max loss: strike − premium (stock going to zero).

Combined with covered calls, this is the backbone of "the wheel" strategy: sell CSPs → get assigned stock → sell CCs → get called away → repeat.

Naked calls & puts

The four verticals

Debit spreads (buying)

Pay now, hope price reaches your short strike by expiration. Max loss: debit paid. Max gain: strike width − debit. Cheaper than an outright long option, but your upside is capped. Great when IV Rank is low.

Example: AAPL at $210. Buy the 210 call for $4, sell the 220 call for $1.50. Net debit $2.50. Max loss $250. Max gain $750 if AAPL ≥ $220 at expiration.

Credit spreads (selling)

Collect premium now, hope the stock stays on the right side of your short strike. Max gain: credit received. Max loss: strike width − credit. Great when IV Rank is high and you have a directional bias you want to express without buying premium.

Example: SPY at $550. Sell the 540 put, buy the 535 put. Collect $1 credit. Max gain $100. Max loss $400 if SPY closes below $535. Probability of profit (approx delta of short strike) ≈ 70%.

Choosing strikes & width

• Short strike delta — 0.20–0.30 for credit spreads gives roughly 70–80% probability of profit with acceptable credit.
• Width — wider = more credit but more capital at risk. $5 wide is the standard retail starting point.
• Days to expiration — 30–45 DTE is the sweet spot for premium sellers.
• Exit rule — close at 50% of max profit. The last half of the credit takes far longer and isn't worth the gamma risk.

Straddles & strangles

Long straddle — buy ATM call + ATM put. Profit if the stock moves sharply in either direction by more than the total premium paid. Long vega, negative theta.

Long strangle — buy OTM call + OTM put. Cheaper than a straddle; needs a bigger move.

Short straddle/strangle — sell the same structures. High-probability, high-risk premium collection. Used by systematic traders with strict risk rules.

Iron condor

Sell a bull put spread and a bear call spread on the same underlying and expiration. You're betting the stock stays between the short strikes. High probability, capped risk on both sides. Ideal environment: elevated IV, expected range-bound price action.

Structure example on SPY at $550: sell 535 put / buy 530 put AND sell 565 call / buy 570 call. Collect $2 combined. Max gain $200. Max loss $300.

Iron butterfly

Tighter cousin of the iron condor — sell ATM straddle + buy OTM wings. Higher credit, lower probability. Used when you think the stock is pinned at a specific level.

Calendar & diagonal spreads

Calendar spread — sell a near-dated option, buy a longer-dated option at the same strike. You're selling high theta and buying lower theta — profiting from time passage while the stock sits near your strike. Also a positive-vega trade.

Diagonal spread — same idea, but different strikes. Combines calendar structure with directional bias. The "poor man's covered call" (buy a deep ITM LEAPS call, sell short-dated OTM calls against it) is a popular diagonal.

Ratio spreads & backspreads

Uneven numbers of long vs short options. A call ratio (e.g., buy 1 ATM call, sell 2 OTM calls) gives cheap or free upside exposure but with unlimited risk beyond the short strike. Backspreads do the opposite — net long options — and profit from explosive moves. Powerful but easy to misprice; trade them small first.

Box spreads & synthetics

Box spreads lock in a risk-free arbitrage return and are used by pros to borrow cash at near-Treasury rates. Synthetic positions (e.g., long call + short put = synthetic long stock) are worth understanding even if you never trade them — they explain why put-call parity exists and why option prices can't drift too far from fair value.

Earnings: the expected move

Look at the ATM straddle for the expiration just after earnings. That price (× ~0.85) is the market's 1-standard-deviation expected move. If TSLA straddle says ±$25, the market is pricing 25 points of move — and the vol crush will wipe most of the extrinsic value whether or not the move happens.

Buying premium into earnings

Possible, but needs an edge. A long straddle profits only if the move exceeds the expected move. Over large samples, this is close to break-even — the market prices events efficiently. Good setups: cheap IV relative to prior earnings IV, expected-move under-pricing.

Selling premium into earnings

Short iron condors or short strangles placed outside the expected move collect inflated premium. You win if the stock stays within the range (vast majority of earnings). You lose big if it gaps beyond your wings. Size tiny — these are defined-risk on condors, but condor losses can still wipe months of wins.

Macro events: CPI, FOMC, NFP

SPX/SPY options are the main vehicle for macro event trading. 0DTE SPX has exploded in popularity because of exactly these events. The same framework applies: expected move from the straddle, vol crush post-release, hedged structures to cap risk.

Dividends, splits, & corporate actions

Ex-dividend dates can trigger early exercise on ITM calls. Splits adjust strikes and multipliers automatically but create odd contracts (e.g., AAPL4 after a split). Mergers and acquisitions can collapse extrinsic value to zero. Always check the corporate action calendar on any name with open positions.

Risk per trade

Define max loss on every trade at entry. For long options: premium paid × number of contracts. For spreads: (strike width − credit) × contracts × 100. Cap per-trade risk at 1–3% of account. One-tenth of that for new traders.

Portfolio-level risk

• Buying power reduction (BPR) — total capital tied up in open positions. Keep under 40–50% of account.
• Net delta — your portfolio's directional exposure. Monitor and adjust so you're not accidentally 500 delta long the S&P.
• Net vega — your exposure to IV. Premium sellers are structurally short vega; a VIX spike hurts a lot.
• Correlation — 10 tech-name credit spreads are effectively one big trade.

Stops & exits

Options don't respond well to stop-loss orders at the contract level (illiquid, volatile prices). Better:

• Mental stop on the underlying — "if SPY breaks 540, I'm closing the put spread."
• Loss multiple — close short spreads when loss hits 2× credit received.
• Profit target — 50% of max profit on short premium. 25–50% on long premium depending on thesis.
• DTE rule — always exit short premium by 21 DTE to avoid gamma risk.

Kelly, half-Kelly, and why full Kelly is ruin

The Kelly criterion gives you the mathematically optimal bet size given edge and odds. The problem: you never actually know your edge. Using full Kelly on estimated edge regularly produces 50%+ drawdowns. Sophisticated traders run at quarter- or half-Kelly and still find it uncomfortable. If you don't know your edge, size like it's very small — because it probably is.

The major retail options brokers

Approval levels

Brokers tier options trading by risk. Typical levels:

• Level 1 — covered calls, cash-secured puts.
• Level 2 — long calls & puts.
• Level 3 — debit & credit spreads, iron condors, butterflies.
• Level 4 — naked options, uncovered index options.

You'll need Level 3 for most of the strategies in this guide. Apply once; answer honestly.

Commissions & assignment fees

Most major US brokers now charge $0.50–$0.65 per contract. Exercise/assignment fees may be $0 or up to $20 depending on broker. Over a year of active trading this matters — tastytrade and IBKR typically win on high-volume options specifically.

The five psychology traps

• Revenge trading — doubling down after a loss. Almost always ends the account.
• FOMO on 0DTE — options casinos are marketed brilliantly. Most degenerate losers.
• Ignoring vol regime — selling premium in a 12 VIX gets you paid nothing for real risk.
• Over-sizing a "sure thing" — there are no sure things. Size as if you might be wrong.
• Not closing winners — giving back profits because "it could go more." Take profits on schedule.

Default treatment: short- or long-term capital gains

Most equity options are taxed like stocks — short-term cap gains if held under a year (ordinary income rates), long-term if held over. Since most options don't last a year, most retail options P&L is short-term ordinary income.

Section 1256: broad-based index options

A major exception: broad-based index options like SPX, NDX, RUT, VIX get Section 1256 treatment — 60% long-term / 40% short-term, regardless of holding period. This mirrors futures and is a structural advantage for active index options traders. SPY, QQQ, IWM are ETFs and do not qualify.

Wash sales

Equity options are subject to wash-sale rules. Loss on a call that is substantially identical to one you buy within 30 days → loss disallowed until the replacement is sold. This is brutal for active traders and one of the main reasons many move to index options (1256) or elect trader tax status + mark-to-market (Section 475).

Covered calls & the qualified covered call rules

If you sell deep ITM calls against long-term stock holdings, you can accidentally disqualify the long-term holding period. IRS rules on "qualified covered calls" are specific — if you're running a sizable covered-call program on a high-basis stock, talk to a CPA.

Regulators

• SEC — oversees equity options, listed exchanges, brokers.
• FINRA — self-regulatory org, broker supervision, suitability standards.
• OCC — the Options Clearing Corporation. Centrally clears every listed US option trade. Your contract counterparty in practice.
• Exchanges — CBOE, NYSE, Nasdaq, etc., with multiple options markets competing for order flow.

Payment for order flow & PFOF

Most US retail options brokers are paid by market makers to route your orders to them — PFOF. This is why "free" commissions exist. Execution quality varies; sophisticated traders use IBKR's SmartRouter or direct exchange routing when spreads are wide enough to matter.