Managing options risk

🎯 In 30 seconds: Options can lose money faster than stocks, and some positions can lose more than you put in. The defenses are simple and boring: know the max loss in dollars before every trade, size so that loss is a small part of your account, prefer positions with a defined max loss, trade only liquid options, treat same-day (0DTE) options as the high-risk product they are, and close positions before expiration instead of letting assignment decide for you. Research on US retail options traders found they lose money on average.

Start with the evidence

A study published in the Journal of Finance in 2023 by Bryzgalova, Pavlova and Sikorskaya looked at retail options trading in the US. It found that retail investors favor cheap, short-dated options, that those options had an average bid-ask spread of 12.6%, and that retail options traders lose money on average. That is not a reason to never trade options. It is a reason to treat risk control as the main skill, not an afterthought.

FINRA and the SEC say the same thing in plainer words: you can lose your whole premium quickly, and some option positions, such as uncovered (naked) calls, have losses with no fixed limit.

1. Size every trade by its max loss

In stocks, you size with a stop loss (see Position sizing). With options you can often do better: many positions have a max loss you can calculate exactly. Use it.

Contracts = (account size x risk per trade) / max loss per contract, rounded down.

Hypothetical $20,000 account, risking at most 2% ($400) per trade, using the trades from earlier chapters:

Trade	Max loss per contract	Contracts at $400 risk	Total at risk
Bear put spread $100/$95	$190	2	$380
Iron condor $90/$95/$105/$110	$290	1	$290
Bull put spread $95/$90	$400	1	$400
Long straddle at $100	$770	0	Too big for this account
Cash-secured put at $47.50	$4,655	0 by this rule	23% of the account

The last row is the uncomfortable one. A cash-secured put or covered call has stock-sized risk. If you trade them, size by the shares you would end up owning, as you would with a stock position, not by the premium you collect.

Practical tip

Write the max loss in dollars in your order notes before you send the order. If you cannot fill in that number, you do not understand the trade well enough to place it. For positions with no fixed max loss, write a realistic bad case instead, such as a 30% overnight gap.

2. Defined risk vs undefined risk

A defined-risk position has a max loss you know in advance: any long option, any vertical spread, iron condors and butterflies. An undefined-risk position does not: naked calls, naked puts sold on margin, short straddles and strangles.

Undefined does not mean "will lose a lot". It means the loss depends on how far the stock goes, and stocks can gap. Compare two ways to bet that a $100 stock stays above $95:

If the stock gaps from $100 to $70, the naked put loses -$2,320 per contract and keeps losing $100 for each further $1 drop. The spread stops at -$400.

Naked $95 put sold for $1.80: max profit	$180
Naked put if the stock gaps to $70	-$2,320
$95/$90 put spread for $1.00 credit: max profit	$100
Spread if the stock gaps to $70	-$400

The spread gives up $80 of potential profit to cut the gap loss from $2,320 to $400. In a $20,000 account, that is the difference between an 11.6% hit and a 2% hit. Many traders use only defined-risk positions until they have a long record. Your broker's options approval levels follow the same logic, see Options approval and risks.

3. Liquidity: the cost you do not see

Every option has a bid (what buyers pay) and an ask (what sellers want). If you buy at the ask and later sell at the bid, the gap is a cost. On options, that gap can be a big share of the price. See Bid, ask and liquidity.

Hypothetical quotes (bid x ask). The percentage is what you lose buying at the ask and selling straight back at the bid. Cheap, far out-of-the-money options are often the worst.

Multi-leg trades pay that cost on every leg. An iron condor with four legs, each $0.10 wide, costs about $0.05 per leg to get in at a fair price and $0.05 to get out: 4 x $0.10 = $0.40, or $40 per condor. On a $210 max profit, that is almost a fifth of the best case, gone.

Signs of a liquid option: a bid-ask spread that is small compared with the price, steady daily volume, and large open interest (the number of contracts outstanding). Use limit orders, start at the midpoint, and walk the price a little at a time. Avoid market orders on options.

4. 0DTE options

0DTE means zero days to expiration: options bought or sold on the day they expire. Major index products now have expirations on every weekday, so 0DTE trading is available every day. FINRA warns that these options are very sensitive to moves in the underlying, that buyers can lose the entire premium within the day, and that a broker may close positions before the end of the day if you could not cover an exercise or assignment.

A hypothetical example with a model, an index-like asset at 100, 15% implied volatility, an at-the-money call bought at the open for $0.38:

What the index does	Call at midday	Call at the close
Nothing	$0.27 (-29%)	$0 (-100%)
Up 0.5%	$0.59 (+55%)	$0.50 (+32%)
Down 0.5%	$0.09 (-76%)	$0 (-100%)

A move of half a percent, which happens on ordinary days, swings the position by more than half its value in hours. For sellers it is the reverse: small, frequent gains and sudden large losses. 0DTE is a short-term speculation product. If you trade it at all, use tiny size, defined risk, and a hard daily loss limit. See Day trading.

5. Early assignment

Most stock and ETF options are American style. If you are short an option, it can be assigned any day. Assignment is most likely when:

The option is deep in the money and has almost no time value left.
It is a short call, the next day is the ex-dividend date, and the dividend is bigger than the call's remaining time value.

Hypothetical example: you are short a $45 call in a spread, the stock is at $50, the call is $5.05 (so $0.05 of time value), and a $0.30 dividend goes ex tomorrow. The call owner gains by exercising today to collect the $0.30. If you are assigned, you are short 100 shares overnight and owe the $30 dividend. Your long call still protects you, but you now need to act. Check ex-dividend dates for every stock where you are short calls. See Exercise and assignment.

6. Close before expiration

At expiration, options that finish at least $0.01 in the money are generally exercised automatically under the OCC's exercise-by-exception process, unless the holder instructs otherwise. Your broker may use its own threshold. So letting short options "just expire" near the strike invites surprises:

Pin risk: the stock closes near your short strike, and you do not know until the next business day whether you were assigned.
After-hours moves: option holders can still submit exercise decisions for a short time after the close, based on news you have not seen yet.
Weekend gaps: if you are assigned shares on a Friday, you carry them over the weekend, possibly without the long option that was protecting you.

The simple fix: close or roll positions with short options before the final day, especially if they are near the money.

7. Rolling, honestly

Rolling means closing an option and opening a similar one with a later expiration, a different strike, or both. Hypothetical example: you sold a $95 put for $1.80. With 7 days left, the stock is at $96 and the put costs $2.40. You buy it back for $2.40 and sell next month's $92.50 put for $2.60, a net credit of $0.20.

That roll did not fix anything. You took a $0.60 loss on the first put, then opened a new trade with a month of fresh risk. Rolling can be sensible when the new position is one you would open from scratch today. It is harmful when it is a way to avoid admitting a loss. Ask: "If I had no position, would I sell this new put right now?" If not, close and walk away.

Common mistake

Rolling a losing short option again and again for small credits. Each roll pushes the loss into the future and often makes it bigger, while the account shows "credits received". Track the total profit and loss of the whole chain of rolls as one trade in your trading journal.

A pre-trade checklist

What is my view: direction, range, or the size of a move? Which strategy matches it?
Max loss in dollars, or a realistic bad case if undefined. Is it within my per-trade limit?
Max profit, breakeven(s), and the self-check that the numbers add up.
Bid-ask spread as a share of the premium, volume and open interest. Am I using a limit order?
Events before expiration: earnings, ex-dividend dates, economic releases.
Early assignment risk on every short leg.
Exit plan: profit target, loss limit, and the date I will close regardless.
Total risk across all open positions, including ones in the same stock or sector.
Have I written all of this down?

Try it

Take the last five options trades you considered or paper traded. For each, fill in the checklist above in your trading journal, and calculate how many contracts your sizing rule would have allowed. Then run one strategy idea on the stock itself in the backtester to see how often the underlying moved more than your breakeven distance in past periods of the same length.

Check yourself

Your account is $20,000 and you risk at most 2% per trade. A bear put spread has a max loss of $190 per contract. How many contracts can you trade? Answer: 2 contracts ($400 / $190, rounded down), putting $380 at risk.
A $100 stock gaps to $70. What happens to a naked $95 put sold for $1.80, compared with a $95/$90 put spread sold for $1.00? Answer: The naked put loses $2,320 and keeps losing as the stock falls. The spread’s loss stops at $400.
You sold a $95 put for $1.80, buy it back for $2.40 and sell next month’s $92.50 put for $2.60. What question should you ask before a roll like this? Answer: "If I had no position, would I sell this new put right now?" The roll locked in a $0.60 loss and opened a new month of risk. If the answer is no, close and walk away.
Why does the chapter say to close short options before the final day instead of letting them expire? Answer: Pin risk, exercise decisions made after the close on news you have not seen, and weekend gaps can leave you assigned with shares you did not plan for.

🧯 Managing options risk: sizing, liquidity, 0DTE, assignment and rolling