What is max loss in options trading?
What is the most a position can cost you?
Max loss is the largest loss a strategy can produce under the stated assumptions, usually at expiration and before fees. On defined-risk spreads it follows from the strike width and the debit or credit. On stock-backed or uncovered positions the loss can be larger, or simply not meaningful to express as a single number.
How it is calculated for common structures
For a long option or a debit spread, maximum loss is the debit paid. For a credit spread it is the width minus the credit. An iron condor has two wings but can only lose on one side at expiration, so its maximum loss is the wider wing minus the total credit. A short uncovered call has no maximum loss at all, and a short put or a stock-backed position can lose down to a share price of zero — a number, but rarely a useful one.
Why position size starts here
Maximum loss is the one number that tells you what a single trade can take out of the account if everything goes wrong at once. That makes it the natural unit for position sizing: decide how much of the account one trade may cost, then divide by the maximum loss per contract. Sizing on the premium or on the margin requirement instead can leave a position several times larger than you intended.
The common misreading
Maximum loss describes the worst case at expiration with every leg still in place. Close one leg on its own, carry assigned shares over a weekend, or exit through a wide bid-ask spread, and the real loss can end up larger. The number also says nothing about how likely that worst case is: two trades with the same maximum loss can differ enormously in how often they actually reach it.
Worked example
Hypothetical numbers for illustration, not a market quote and not a recommendation.
An example stock trades at 100 €. You open an iron condor: sell the 95 € put, buy the 90 € put, sell the 105 € call and buy the 110 € call, all with the same expiration, for a total credit of 1.80 € per share, or 180 € per contract.
Both wings are 5 € wide and only one side can finish in the money, so maximum loss is (5 − 1.80) × 100 = 320 €. With a hypothetical 20,000 € account and a limit of 2 percent per trade, the budget is 400 €, which allows one contract. Fees are ignored.
Strategies where the term matters
- Short Iron Condor — Is the range you expect genuinely narrower than the move the market has priced in?
- Protective Put — What does this insurance cost you per year, as a percentage of the position?
Calculators for this term
Track it in your journal
Related terms
Every term in one place: the options glossary.
This material is general information about option strategies, written for a general audience. It is not investment advice, not a recommendation, and not financial analysis. Options can lose their entire value, and uncovered positions can lose more than the amount committed. Anything said about tax is general in nature and is no substitute for professional tax advice. Last reviewed: 2026-08-06.