Stock options,
in plain English.
Seven short lessons, three calculators, a practice ticket you can push around, and a straight answer on which brokers let you do what. Buying and selling. Nothing here places an order.
Education only. Not financial advice and not a broker. Options can expire worth nothing.
You can be right about the direction and still lose everything you put in. The stock has to move the right way, far enough, before the deadline. Three conditions, not one. Miss any of them and a bought option goes to zero.
That is not a flaw you can trade around. It is what the product is. Learn it here, where it costs nothing.
Seven lessons. One idea each.
Read in order the first time. The last two are about selling options, which is where the real money and the real damage both live.
An option is a contract, and one contract covers 100 shares. Every price you see quoted is per share, so a contract shown at $2.00 costs you $200.
You are buying the right to buy, or to sell, at a set price, any time up to a set date. You are never forced to use it. If it is worthless at the end, you simply let it expire.
Three things define every option: the strike (the set price), the expiry (the deadline), and the premium (what it costs).
In one lineOne contract = 100 shares. The quoted price is per share. Multiply by 100.
A contract is quoted at $1.50. What does one cost you?
$1.50 per share across 100 shares = $150. This is the single most common beginner mistake.
A call is the right to buy at the strike. You buy a call when you think the stock goes up.
A put is the right to sell at the strike. You buy a put when you think the stock goes down — or to protect shares you already own, like insurance on a position.
Both are bought exactly the same way, with the same few fields on the ticket. Nothing about a put requires you to own the stock first.
In one lineCall = up bet. Put = down bet. Buying either one caps your loss at what you paid.
You think a stock is about to fall. The straightforward buy is…
A put gains as the stock falls, and the most you can lose is the premium you paid.
The premium is spent the moment you pay it. The only question after that is what the contract is worth later.
Break-even on a bought call is the strike plus the premium. On a bought put it is the strike minus the premium. Below that line on a call, you are still down even though the stock went up.
So a trade needs three things, not one: the right direction, far enough, and before the deadline. Miss any of the three and it loses.
In one lineRight direction + not far enough + out of time = a loss. This is why options feel unfair at first.
You buy a $40 call for $2.00. Where is break-even at expiry?
Strike $40 + $2.00 premium = $42. At $41 the contract is worth something, but you are still down overall.
Part of what you pay is time value — the price of the possibility that the stock moves before the deadline. Every day that passes, some of it drains away.
The drain is not steady. It speeds up as expiry approaches, and the final weeks are by far the steepest. A contract that lost a little each day for a month can lose the rest in days.
This is why so many bought options that are simply held to the end expire worth nothing. The stock did not have to go the wrong way. It just had to not go far enough, fast enough.
In one lineTime is a cost you pay whether or not anything happens. Buying far-dated costs more and buys you room.
Two weeks pass and the stock has not moved at all. Your bought call is…
Time value drained out of it. Nothing had to go wrong for you to be down.
The chain is the menu of every contract on a stock: strikes down the middle, calls on one side, puts on the other, one page per expiry date.
Bid is what a buyer will pay you. Ask is what you must pay. The gap between them is the spread, and you pay it on the way in and again on the way out. On a $2.00 contract a $0.40 spread is 20% of the trade, gone before anything happens.
Volume is how many traded today. Open interest is how many contracts exist. Low numbers mean a wide spread and real trouble getting out at a sensible price.
In one lineThin contracts are the trap. Check the spread and the open interest before the price.
Bid $1.80, ask $2.20. You buy at market. Roughly what do you pay?
Buying at market pays the ask. You are instantly down the spread — $40 on one contract here.
Every option someone buys was sold by someone else. The seller collects the premium immediately and wants the contract to expire worthless.
A covered call: you already own 100 shares and sell a call against them. You keep the premium. The cost is that if the stock runs past the strike, your shares get sold at the strike and you miss the rest of the move.
A cash-secured put: you set aside the full cash to buy 100 shares and sell a put. You keep the premium. The cost is that if the stock falls below the strike, you must buy those shares at the strike — above the market price.
In one lineSelling trades a known payment now for someone else's decision later. Covered and cash-secured keep it survivable.
You sell a covered call and the stock rockets past the strike. You…
The shares you own cover it. You keep the premium and the gain up to the strike, and give up everything above it.
Assignment is when the person who bought the option uses their right and you have to deliver. On US stock options this can happen on any trading day before expiry, not only at the end.
If you are covered or cash-secured, assignment is an inconvenience you planned for — you hand over shares you own, or buy shares with cash you set aside.
A naked call is selling a call with no shares behind it. A stock has no ceiling, so the loss has no ceiling either. This is the position that takes more than the account it was opened in, and it is why brokers gate it behind the highest approval level.
In one lineBuying caps the loss at what you paid. Selling without cover caps nothing.
What is the most you can lose on a call you BOUGHT?
That is the one genuinely reassuring thing about buying options: the worst case is the premium, and it is known before you click.
The words, without the costume 16 terms
- Call
- The right to buy 100 shares at the strike, up to the expiry date.
- Put
- The right to sell 100 shares at the strike, up to the expiry date.
- Strike
- The set price in the contract. The level everything is measured against.
- Premium
- The price of the contract, quoted per share. Multiply by 100 for one contract.
- Expiry
- The deadline. After it the contract is gone, worth whatever it was worth at the end.
- In the money
- The contract has built-in value right now — a call below the stock price, a put above it.
- Out of the money
- No built-in value yet. All of its price is time value and hope.
- Intrinsic value
- What the contract would be worth if today were the deadline.
- Time value
- Everything you pay above intrinsic value. It drains to zero by expiry.
- Break-even
- Strike plus premium on a call, strike minus premium on a put.
- Bid / Ask
- What someone will pay you, and what you must pay. The gap is a real cost.
- Open interest
- How many contracts exist at that strike. Low means hard to get out of.
- Implied volatility
- How much movement the market is pricing in. High IV makes options expensive.
- Assignment
- The buyer used their right; as the seller you must deliver shares or cash.
- Covered
- You hold the shares (or the cash) that back the option you sold.
- Naked
- You sold an option with nothing behind it. Unlimited risk on a call.
Push the numbers until it clicks.
Round figures on purpose. XYZ is the industry's placeholder ticker, not a real company, and nothing here is connected to a broker.
Expiry-day value only. Before the deadline a contract is worth more than this, because time value has not drained out yet. Fees and the bid/ask spread are ignored.
An honest approximation, not a pricing model. Time value roughly tracks the square root of the time remaining, which is why the last days fall off a cliff while the first weeks feel slow. A real quote also moves with implied volatility, and this assumes the stock sits perfectly still.
The annualised figure assumes you could repeat this every period for a year at the same price, which nobody can. It is there to compare two trades, never as a forecast. XYZ is assumed at $40.
The ticket, and where you place it.
Learn the eight fields once and every broker's screen becomes readable, however they arrange it.
The options ticket, field by field
Generic on purpose — not a copy of any one broker's screen. Tap any field to find out what it does, or tap a price in the chain underneath to load it in. Nothing here is connected to anything.
Which stock, and which deadline. The same strike on two different expiry dates is two completely different prices and two completely different trades. Check the date before anything else — picking this Friday instead of next month is the most expensive misclick in options.
The direction. Call if you want the stock up, put if you want it down. Brokers put these side by side and they are one tap apart, so read it back to yourself before you confirm.
Four choices, and they are not interchangeable. Buy to open starts a bought position. Sell to close exits it. Sell to open starts a SOLD position — a completely different trade with completely different risk. Buy to close exits that. Picking "sell to open" when you meant "sell to close" opens a brand new short instead of closing anything.
The set price. Further out of the money is cheaper per contract and needs a bigger move to pay — which is why cheap contracts are not the safe ones. Cheap usually means the market thinks it will not get there.
The quantity trap. This box says 1, 2, 5 — it does not say 100, 200, 500 shares, which is what you are actually controlling. Typing 10 here is a thousand shares of exposure.
Use a limit order. Options spreads are wide compared to stocks, and a market order pays the ask on the way in and takes the bid on the way out. On a thin contract that difference alone can be a fifth of the trade.
Premium times 100 times contracts. On a bought option this is a debit — money leaves. On a sold option it is a credit — money arrives, and an obligation arrives with it. Read which one it says.
The number to read before you confirm. On anything you bought, max loss is the debit and it is final. On anything you sold, look hard — if it says unlimited, you are in naked territory and should not be there yet.
| Call | Strike | Put |
|---|---|---|
| $50 | ||
| $45 | ||
| $42 | ||
| $40 | ||
| $38 | ||
| $35 | ||
| $30 |
Notice the pattern: calls get cheaper as the strike rises, puts get cheaper as it falls, and the cheapest contracts are the ones needing the biggest move. Cheap is not safe — cheap is unlikely.
In the US you cannot simply start trading options. You apply inside your brokerage account, answer questions about income, net worth and experience, and get granted a level. Each level unlocks more.
The ordering is broadly the same everywhere — covered and cash-secured selling, then buying calls and puts, then spreads, then naked selling last. The numbering is not standard, so "Level 2" at one broker is not "Level 2" at another. Read your own broker's table rather than a screenshot from somewhere else.
If you get declined, that is the system doing its job. Answer honestly; a level you talked your way into is a level you are not ready for.
Robinhood
Mobile first- Suits
- The simplest ticket of the lot, which is both the appeal and the risk — it is very easy to place a trade you have not thought about.
- Approval
- Levels, with basic buying and covered strategies lower down and spreads higher up. A cash account is capped below the top level, and on a joint account both owners must be approved.
The app most new options traders start on. Its simplicity hides things other platforms show by default, like full chain detail and the spread you are paying.
Fidelity
Full service- Suits
- Strong research and education, slower and more conservative approval.
- Approval
- Three tiers, with the requirements rising at each one. Fidelity publishes exactly which strategies sit in which tier.
A good first broker if you want the education built in. Its approval questionnaire is stricter than the app brokers, which frustrates people and protects rather more of them.
Charles Schwab
Full service- Suits
- Deep platform, now including the thinkorswim tools it took on from TD Ameritrade.
- Approval
- Strategy levels applied for inside your account, under Profile then Margin & Options. Approval is not instant.
thinkorswim is the serious end of retail options tooling, and its paper-trading mode is worth more than most paid courses. The learning curve is real.
E*TRADE
Full service- Suits
- Part of Morgan Stanley. Power E*TRADE is the options-focused platform.
- Approval
- Tiered approval, applied for inside the account.
Power E*TRADE puts risk and break-even on the ticket itself, which is exactly the habit this guide is trying to build.
Webull
Mobile first- Suits
- App-first with more chain detail on screen than Robinhood.
- Approval
- Four levels. A cash or IRA account is capped at level two; spreads need level three and a minimum margin equity. Webull publishes the full table.
Shows more of the chain than the simplest apps, which helps. Worth knowing FINRA has fined Webull over how it approved options accounts — being approved easily is not the same as being ready.
tastytrade
Options specialist- Suits
- Built by and for options traders, heavily oriented toward selling premium.
- Approval
- Three permission levels — Limited, Basic and The Works — each with its own qualification requirements.
The platform and its education lean hard toward selling premium. That is a legitimate approach and also a house view — read it knowing that.
Interactive Brokers
Professional- Suits
- The cheapest serious platform, and the least forgiving interface.
- Approval
- Four tiers of options trading permission, requested per product alongside experience questions.
Excellent pricing and execution. The interface assumes you already know what you are doing, which makes it a poor first broker and a good third one.
How options accounts actually go to zero.
Almost never one catastrophic trade. Usually the same small mistake, repeated, until there is nothing left.
A contract expiring this week is cheap because it almost certainly will not get there. You are paying little for very little.
"Only $3.50" is $350 a contract. Ten contracts is $3,500. The ticket shows the per-share price; your account pays the other number.
Time value does not come back. A losing option held to the end is usually a total loss instead of a partial one.
Low open interest means a wide spread. You pay it going in and again coming out, before the stock does anything at all.
It is not free, it is paid in advance for a risk with no ceiling. This is the one that takes more than the account.
Implied volatility inflates the price before the announcement and collapses after it. The stock can move your way and the contract still falls.
- Only what you can lose entirely — a bought option going to zero is an ordinary outcome, not a disaster scenario.
- Limit orders, always — name your price on the way in and on the way out.
- Buy more time than you think you need — the extra weeks are the cheapest insurance in options.
- Take partial profits — an option that doubled and then expired worthless is the most common story in this market.
- Nothing naked — cover it with shares or cash, or do not sell it.
- Count contracts in shares — say "five hundred shares", not "five contracts", until the size feels real.
- Apply for options at your broker. Answer the questions honestly and take whatever level you are given.
- Read the official risk document your broker hands you. It is dull and it is the real thing.
- Paper trade twenty contracts if your broker offers it: open, set an exit, close. Schwab's thinkorswim and others include this.
- First five live trades: one contract. Not two. The goal is proving the process, not making money.
- Write down the break-even and the max loss before every single order. If you cannot state both, do not place it.
Education only. Not financial advice, not a broker, not a solicitation. Options can expire worth nothing; if you buy one you can lose the entire amount you paid, and if you sell one uncovered you can lose more than you received. XYZ Corp is not a real company and every price shown is invented. Approval levels, fees and available strategies differ by broker — verify everything on your broker's own site before you trade.