- Buy a call
You expect: the stock to rise.
You pay: the premium.
Max loss: the premium paid.
Max gain: no maximum. - Buy a put
You expect: the stock to fall.
You pay: the premium.
Max loss: the premium paid.
Max gain: large, if the stock goes to $0. - Sell a call
You expect: flat, down, or modestly up.
You receive: the premium.
Max loss: covered, you give up gains and may sell your shares; naked, no maximum.
Max gain: the premium. - Sell a put
You expect: flat or up.
You receive: the premium.
Max loss: large but defined: (strike − premium) × 100.
Max gain: the premium.
Run your own numbers: free payoff calculator
Can you lose more than you invest? Buying options: no. Selling a call without the shares: yes. See the five losses beginners miss.
- What an option is
- Calls vs. puts
- How price works
- Calculator
- 5 hidden losses
- Sell, exercise, or expire
- U.S. rules
- 0DTE
- Taxes
- FAQ
Hypothetical examples only. Options involve risk and aren’t suitable for every investor. Many options expire worthless, and short-dated options can lose value very fast.
What an Option Is, in One Minute
An option is a contract that gives the buyer the right, but not the obligation, to buy or sell a stock at a set price before a set date.
The set price is the strike price. The set date is the expiration. What the buyer pays up front is the premium, and the seller keeps it. Standard U.S. equity options cover 100 shares per contract (contracts adjusted after splits or mergers can differ).
One contract = 100 shares. Multiply every price you see by 100.
The buyer has the right. The seller has the obligation if the buyer uses that right. Everything below follows from that split.
Calls vs. Puts: The Four Positions
A call is the right to buy; a put is the right to sell; and each can be bought or sold, which gives four positions.
Think of a call as a refundable-deposit right to buy at today’s price. Think of a put as insurance on something you own. In every example below, XYZ trades at $100, the option expires in 30 days, the strike is $100, and the premium is $3 ($300 per contract).
| Position | You expect | You pay or receive | Breakeven | Max loss | Max gain | Obligation |
|---|---|---|---|---|---|---|
| Buy call | Up | Pay $300 | $103 | $300 | No max | None |
| Buy put | Down | Pay $300 | $97 | $300 | $9,700 | None |
| Sell covered call | Flat to modestly up | Receive $300 | — | Share risk; capped upside | $300 + share gain up to $100 | May have to sell shares |
| Sell naked call | Flat or down | Receive $300 | $103 | No max | $300 | May have to deliver shares |
| Sell put | Flat or up | Receive $300 | $97 | $9,700 | $300 | May have to buy 100 shares at $100 |
Buy a call
UPSIDE: XYZ rises to $120. The call is worth $20 ($2,000), a $1,700 gain.
BREAKEVEN: $103 at expiration (strike + premium).
DOWNSIDE: XYZ ends at $100 or below. The call expires worthless and you lose the $300.
A stock can go up and your call can still lose money.
Buy a put
UPSIDE: XYZ falls to $80. The put is worth $20 ($2,000), a $1,700 gain.
BREAKEVEN: $97 (strike − premium).
DOWNSIDE: XYZ ends at $100 or above. You lose the $300.
Sell a call: covered vs. naked
Covered means you own the 100 shares. Naked means you don’t. This difference is the whole risk story.
UPSIDE: XYZ stays below $100 and you keep the $300.
BREAKEVEN: naked, $103. Covered, your shares offset losses above the strike but you give up gains.
DOWNSIDE: XYZ jumps to $150. Covered, you may have to sell shares at $100 and miss the rise. Naked, you owe $50 a share ($5,000) minus the $300 you collected, and there is no ceiling.
Selling a call without the shares has no maximum loss.
Covered calls are the idea behind some income funds; see Option-Income ETFs.
Sell a put (cash-secured if you set the cash aside)
UPSIDE: XYZ stays at $100 or above and you keep the $300.
BREAKEVEN: $97.
DOWNSIDE: XYZ falls to $0. You must buy 100 shares at $100 for $10,000 that are worth nothing, a $9,700 loss after the premium. The risk is large but defined, unlike a naked call.
Beyond the four positions
A spread pairs an option you buy with one you sell, which can cap the loss that a single sold option would carry. Spreads need broker approval and have their own breakevens. The calculator below handles single options only, and this guide does not recommend any strategy. Binary options and other newer products have different payoffs and aren’t covered here.
What You’re Actually Paying For
A premium is intrinsic value (what the option is worth if used right now) plus extrinsic value (the price of time and uncertainty).
A call is in the money when the stock is above the strike, at the money near it, and out of the money below it. Puts are the reverse. An out-of-the-money option is all extrinsic value, and that part shrinks toward zero by expiration.
Two forces move extrinsic value: time (more days left costs more) and implied volatility (the bigger the swings the market expects, the higher the premium). Three Greeks summarize this, with no math needed:
Delta: roughly how much the option moves when the stock moves $1.
Theta: roughly how much value the option loses each day from time passing.
Vega: roughly how much the option changes when implied volatility changes.
Reading a quote. The bid is what buyers offer and the ask is what sellers want. Volume is today’s trading and open interest is how many contracts are open. Thin volume and a wide bid-ask gap make it costly to get out. Use limit orders, which cap the price you pay or accept, rather than market orders.
Run Your Numbers: Options Payoff Calculator (At Expiration)
This calculator shows breakeven, maximum loss, and maximum gain for all four positions at expiration.
The 5 Losses Beginners Don’t See Coming
Most beginner losses come from five mechanics that the headline price hides, and each can cost real money even when your stock view is right.
1. The ×100 surprise
Example: An option quoted at $2.50 costs $250, and ten contracts cost $2,500.
Quotes are per share. Multiply by 100 and by the number of contracts before you click.
2. Time decay
Example: XYZ stays at $100 for two weeks. Your $3 call may be worth about $1.50, a $150 loss with no move in the stock.
Extrinsic value falls every day, and it falls faster near expiration.
3. IV crush
Example: You pay $6 ($600) for a call before earnings. XYZ rises $2, but implied volatility drops after the report, and the call is worth $4.50. You lose $150 although the stock went up.
Premiums swell before big events and deflate after them. Avoid earnings trades until you understand this.
4. Expiration and auto-exercise
Example: You hold a $100-strike call and XYZ closes at $100.01. That is $0.01 in the money, so it can be exercised automatically, and you would owe $10,000 for 100 shares you may not be able to afford.
OCC’s exercise-by-exception process exercises expiring options that are $0.01 or more in the money unless you instruct otherwise. Your broker may have its own cutoff and may close positions if the account can’t support the result. In special cases such as a trading halt or corporate action, OCC can remove a class of options from automatic exercise, and “do not exercise” or “exercise” instructions have broker deadlines. See Your Option Expires In the Money.
An option in the money by one cent can be exercised automatically.
5. Assignment (for sellers)
Example: You sold a $100 call on XYZ. Before a dividend, the buyer exercises early and you must deliver 100 shares, or be short them if you don’t own any.
Most U.S. single-stock and ETF options are American-style and can be assigned before expiration, and a short option can be exercised against you even when it is out of the money. If you hold two legs and one ends in the money by less than $0.01, the other can be left unhedged. Calls near an ex-dividend date carry extra early-assignment risk; see Ex-Dividend Date Explained.
Also watch the bid-ask spread. If the bid is $2.00 and the ask is $2.40, buying at $2.40 and selling right away at $2.00 costs $40 per contract before anything moves. Order types matter too; see Stop-Loss Sold Below Stop Price. Leverage can surprise you in other places as well; see Why Leveraged ETFs Lose Value.
| Loss | What causes it | Dollar example | How to see it coming |
|---|---|---|---|
| ×100 surprise | Per-share quotes | $2.50 → $250 | Multiply by 100 first |
| Time decay | Days passing | $150 lost, stock flat | Check days to expiration |
| IV crush | Volatility falls after an event | $150 lost, stock up | Know the earnings date |
| Auto-exercise | $0.01+ in the money at expiration | $10,000 share bill | Close before expiration |
| Assignment | Buyer exercises against you | Forced share delivery | Watch dividends and moneyness |
Sell to Close, Exercise, or Let It Expire
You have three exits, and most buyers sell to close because it captures any remaining time value without needing the cash for 100 shares.
| Choice | What happens | Cash needed | When it fits |
|---|---|---|---|
| Sell to close | You sell the option you hold and keep the difference | None | Most buyers, most of the time |
| Exercise | You buy (call) or sell (put) 100 shares at the strike | Strike × 100 for a call | When you want the shares and have checked the cost |
| Let expire, out of the money | The option ends worthless | None | You accept losing the premium |
| Let expire, in the money | Likely exercised automatically at $0.01+ | Strike × 100 for a call | Only if you can afford the result |
Exercising turns the option into stock: the premium rolls into the stock’s cost basis (calls) or sale proceeds (puts). Exercising early also gives up any remaining time value. Details are in the IRS’s Publication 550.
U.S. Rules That Apply to You
To trade options in the U.S., your broker must approve your account and give you the OCC’s risk booklet, and several other rules shape what you can do.
Approval. FINRA Rule 2360 requires the firm to specifically approve the account for options and to deliver Characteristics and Risks of Standardized Options (the options disclosure document) at or before approval. Approval levels vary by broker, with no universal numbering, so check what yours allows. Selling options generally needs a higher level. You will also be asked to sign an options agreement (the rule sets a 15-day window after approval), and anyone selling uncovered options receives a separate written risk statement.
Not insured against losses. Brokerage accounts are not FDIC-insured. SIPC protects customers if a broker fails, not against market losses. Many brokers allow limited options strategies in IRAs, but which ones varies by broker and account type.
Cash vs. margin. A margin account lets you borrow and sell riskier positions. A cash account has settlement limits; see Good Faith Violation.
PDT replaced. FINRA’s new intraday margin standards (Regulatory Notice 26-10) replaced the pattern-day-trader rules, including the day-trade count and the $25,000 minimum, effective June 4, 2026. Brokers may phase them in through Oct. 20, 2027, so your broker may still apply the old rules until it switches. Ask yours. The new standards apply to margin accounts, including margin used for 0DTE options, and instead of a trade count they look at whether your account has an intraday margin deficit. Cash-account settlement rules still apply, and the separate $2,000 level for borrowing on margin remains (below it you can trade only with your own cash). Your broker can also set stricter limits. See PDT Rule Replaced.
Settlement. Options trades settle the next business day (T+1). Stock delivered on exercise or assignment also settles T+1, the standard cycle for U.S. stocks.
Corporate actions. Mergers, splits, and special dividends can adjust a contract (different share count or a cash deliverable). OCC publishes information memos for each adjustment, so check before you hold through one.
Style. Most single-stock and ETF options are American-style. SPX is European-style and cash-settled.
| Underlying | Style | Settlement | Early assignment? | Tax treatment (general) |
|---|---|---|---|---|
| A single stock | American | Shares | Yes | Capital gain or loss; holding-period rules |
| An S&P 500 ETF | American | Shares | Yes | Capital; not Section 1256 |
| S&P 500 index (SPX) | European | Cash | No | Generally Section 1256 (60/40, marked to market at year-end) |
0DTE Options, Plainly
0DTE options expire the same day you trade them, so almost all of their value is time value that melts within hours.
Cboe reported record market-wide 0DTE volume of 24.2 million contracts a day in Q3 2026, about 36% of all options volume (State of the Options Industry Q3 2026, published October 2026). Within index options, 0DTE was about 56% of the flow, and Cboe said 0DTE was a record 65% of SPX activity. Single-stock 0DTE is growing too, because some popular names now have Monday and Wednesday expirations.
Popularity is not safety. Time decay is brutal intraday, a small move can erase the whole premium, and FINRA’s new intraday margin rule covers margin used for 0DTE options. At a margin broker, selling options or letting long options expire can reduce your account’s margin cushion during the day, so a 0DTE trade can create an intraday margin deficit. 0DTE is not a beginner product.
How Options Are Taxed (the Short Version)
This is general information, not tax advice; talk to a tax professional about your situation.
Gains and losses on equity and ETF options are generally capital, with holding-period rules. A long option that expires worthless is generally a capital loss, and gains or losses on options you sold are generally short-term. Wash-sale rules can apply to options; see Wash Sale Rule 2026. Exercising rolls the premium into the stock’s basis or proceeds (IRS Publication 550).
Broad-based index options such as SPX are generally Section 1256 contracts: gains and losses are treated 60% long-term and 40% short-term regardless of holding period, open positions are marked to market at year-end, and the wash-sale rule does not apply. They are reported on Form 6781. ETF options such as SPY, single-stock options, and narrow-based index options are not Section 1256 contracts. Your broker’s Form 1099-B shows how each trade was classified. Keep records of every trade.
Before Your First Trade
Run through these eight items before every options trade.
- 1. Read the OCC booklet Characteristics and Risks of Standardized Options.
- 2. Know your approval level and what it allows.
- 3. Know whether your account is cash or margin, and what that means for settlement.
- 4. Write down your breakeven, max loss in dollars, and exit plan (sell to close before expiration, or let it expire).
- 5. Never hold an in-the-money option into expiration unless you can afford the shares or have checked your broker’s cutoff.
- 6. Avoid trading right before earnings until you understand IV crush.
- 7. Size it as money you can lose entirely.
- 8. Keep records for taxes.
Choosing a broker comes first; see Best Online Stock Brokers.
FAQ
What’s the difference between a call and a put?
A call is the right to buy at the strike; a put is the right to sell at the strike. Calls gain when the stock rises; puts gain when it falls.
Is buying a put the same as shorting a stock?
No. A put buyer’s loss is capped at the premium. A short seller’s loss has no cap and may involve borrowing shares.
Can you lose more than you invest with options?
Buying options: no, the most you lose is the premium. Selling a naked call: yes, theoretically without limit. Selling a put: large but defined.
Why did my call lose money when the stock went up?
The stock may not have risen past your breakeven, time decay may have eaten the premium, or implied volatility may have dropped (IV crush).
What does “in the money” mean?
A call is in the money when the stock is above the strike; a put when it is below.
What happens if my option expires in the money?
It can be exercised automatically if it is $0.01 or more in the money. You then buy or sell 100 shares per contract. Brokers may have their own cutoffs.
Should I sell to close or exercise?
Most buyers sell to close, which keeps remaining time value and needs no cash for shares. Exercise only if you want the shares and have the cash.
Do I need 100 shares to buy a call?
No. You need 100 shares per contract to sell a covered call.
What’s a covered call?
Selling a call while owning 100 shares per contract. You collect the premium, cap your upside at the strike, and may have to sell the shares.
What’s a cash-secured put?
Selling a put with enough cash set aside to buy 100 shares at the strike if assigned.
What is assignment?
When a buyer exercises, a seller is chosen to fulfill the contract: delivering shares for a call or buying them for a put.
How much money do I need to start trading options?
There is no universal minimum. It depends on your broker, approval level, and strategy. Buying one contract costs the premium × 100; selling can require far more.
Do I still need $25,000 to day trade options?
Not under FINRA’s rules. The new intraday margin standards replaced the pattern-day-trader rules and the $25,000 minimum effective June 4, 2026. But brokers may phase them in through Oct. 20, 2027, so yours may still apply the old rules for now, and it can set stricter limits. Cash accounts have their own settlement rules, and the $2,000 level for borrowing on margin still applies.
What are options trading levels?
Tiers of approval that brokers assign. They vary by broker, so check your firm’s definitions.
What are 0DTE options?
Options that expire the same day. They carry very fast time decay and are not a beginner product.
How are options taxed?
Generally as capital gains or losses with holding-period rules; broad-based index options may be Section 1256 contracts. Ask a tax professional.
Do wash-sale rules apply to options?
They can. See Wash Sale Rule 2026 and ask a tax professional.
Can I trade options in an IRA?
Many brokers allow it, usually limited to lower-risk strategies and without margin. What’s allowed varies by broker and account type, so ask yours.
What is a spread?
A position that combines an option you buy with one you sell. It can cap the maximum loss, needs broker approval, and has its own breakeven. This guide doesn’t recommend any strategy.
What is a limit order and why use one?
An order that sets the most you’ll pay (or the least you’ll accept). Options can have wide bid-ask gaps, so a market order can fill at a poor price.
Are options better than buying the stock?
Neither is better for everyone. Options give leverage, but a defined expiration date means you can lose the whole premium even if you were only early.
Sources: OCC options disclosure document, FINRA Regulatory Notice 26-10, FINRA: Understanding the New Intraday Margin Requirements, Investor.gov margin bulletin, Cboe State of the Options Industry Q3 2026, IRS Publication 550 and Form 6781 instructions.
Disclaimer: This article is educational information only, not investment, tax, or legal advice. Examples are hypothetical. Options involve risk and are not suitable for all investors. Read Characteristics and Risks of Standardized Options before trading. Rules verified November 7, 2026.
Last updated:
Daniel Hayes is the founder and sole researcher at AdvoraHQ. He covers U.S. personal finance, insurance, and consumer law — working directly from IRS publications, federal and state statutes, court opinions, and SEC filings rather than secondary summaries. His focus is the gap between what readers think they know and what the source documents actually say. Daniel is not a licensed attorney, CPA, or financial advisor; his articles are educational and not personalized advice. Reach him at Daniel.Hayes@advorahq.com.
