Binary options explained: fixed payout digital options
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
Binary options are short dated digital contracts that pay a fixed amount if a yes or no condition is met at expiry, and nothing otherwise. The condition is usually whether an underlying asset settles above or below a strike. They are also called all or nothing options and have been banned for retail sale in many jurisdictions.
What is binary options?
A binary option is a digital derivative whose payoff is discontinuous. If the underlying meets the contract condition at expiry, typically settling above or below a strike, the holder receives a fixed cash amount. If the condition fails, the holder receives nothing. This contrasts with vanilla options, where payoff scales linearly with how far the underlying moves past the strike. Binary options trade with expiries ranging from minutes to days and are quoted as a price between zero and the maximum payout, reflecting the market implied probability of the condition being satisfied at expiry.
How traders use binary options
Institutional desks rarely use retail style binary options. They use bespoke digital structures embedded in exotic options books, primarily to hedge barrier risk or to express precise probability views around scheduled events such as central bank meetings or data releases. The fixed payoff makes digitals useful for expressing a discrete event view without taking on directional gamma. Retail use, where still legal, typically involves very short expiries on FX pairs and indices through specialist platforms. The desk notes that the structural negative expectancy on most retail binary platforms, combined with operator conflicts of interest, has driven regulators including ESMA, the FCA, ASIC, and the SEC to restrict or prohibit retail sale across the European Union, United Kingdom, and Australia.
Common misconceptions about binary options
The first misconception is that binary options are a form of regulated options trading similar to listed equity options. In most retail implementations they were over the counter products offered by the platform itself, which acted as counterparty. The second misconception is that a fifty percent win rate produces breakeven results. Because payouts are typically less than one hundred percent of stake while losses are full stake, the required win rate to break even sits well above fifty percent. The third misconception is that short expiries reduce risk. Shorter expiries increase the variance of outcomes and the influence of spread and execution friction.
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Frequently asked
Are binary options legal?
Retail binary options are banned or heavily restricted in the United Kingdom by the FCA, across the European Union by ESMA, and in Australia by ASIC. In the United States, binary options can only be offered legally on regulated exchanges such as the Nadex platform overseen by the CFTC. Many offshore platforms continue to solicit clients in restricted jurisdictions, which regulators have repeatedly flagged as a source of consumer harm and fraud.
How do binary options differ from vanilla options?
Vanilla options have a continuous payoff. A call option pays the difference between the underlying price at expiry and the strike, so the further in the money it finishes, the larger the payout. Binary options have a discontinuous, fixed payoff. The contract pays a set amount if the condition is met by any margin, and nothing if it fails. This makes binaries behave more like event bets than directional derivatives.
Why do regulators consider binary options high risk?
Regulators have cited several structural concerns. The product offers a negative mathematical expectation when payouts are below one hundred percent of stake. Many platforms acted as direct counterparty to client trades, creating a conflict of interest. Short expiries encouraged high trading frequency, amplifying losses. ESMA published evidence that the majority of retail binary options accounts lost money, which informed the EU wide prohibition introduced in 2018.
Can binary options be priced using Black Scholes?
Yes. A cash or nothing binary option has a closed form price under Black Scholes assumptions equal to the discounted risk neutral probability that the underlying finishes above the strike, multiplied by the cash payout. This is mathematically the derivative of the vanilla call price with respect to the strike, scaled. Institutional desks use this relationship to hedge digital exposures with tight call spreads on the same underlying and expiry.
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