A fixed-return binary outcome may return a predefined profit when correct and forfeit the stake when wrong. If the net gain on a winner is b times stake, the break-even probability before additional…
Understand the mechanism
A fixed-return binary outcome may return a predefined profit when correct and forfeit the stake when wrong. If the net gain on a winner is b times stake, the break-even probability before additional costs is 1 / (1+b). The shorter the expiry, the more consequential price quoting, settlement rules and execution details can become. Regulatory protections differ by jurisdiction.
Before applying this topic in a live market, write down the information available before the decision. Distinguish a fact confirmed by a platform specification or official source from an interpretation drawn from a chart. If a key data point is missing, treat it as unknown rather than filling it with a convenient estimate.
Worked example or scenario
At an illustrative 80% net winner payout, break-even hit rate is 1 / 1.8 = 55.56%. At 60% payout, the threshold rises to 62.5%. These are mathematical examples, not actual platform offers.The numbers and scenarios in this example are educational illustrations. They are not live quotes, account-specific contract terms, backtested guarantees or a suggestion to place this trade. Consider how the outcome changes when costs, a different contract multiplier, or a faster market are introduced.
Common mistakes and limitations
Believing a 50% win rate is sufficient whenever the profit on a win is smaller than the loss on a defeat.
Check whether any assumption depends on a fixed spread, a guaranteed fill, a historical relationship remaining stable, or the availability of a financial product in your country. In practice, execution rules and platform legal entities differ. A correct formula using an incorrect contract multiplier can still produce a dangerously wrong position size.
Four-point practical checklist
- 1
Step 1
Identify the exact instrument and contract terms before doing any arithmetic.
- 2
Step 2
State the risk and assumptions in account currency, not only in chart points.
- 3
Step 3
Check current primary-source information and write down what could invalidate the idea.
- 4
Step 4
Compute break-even percentages for payouts of 55%, 70%, 85% and 90%; then account for any extra costs.
Practice assignment
Compute break-even percentages for payouts of 55%, 70%, 85% and 90%; then account for any extra costs.
Complete the task in a journal, spreadsheet or demo account and keep a record of your assumptions. If you are unable to explain the possible loss in your own account currency, do not substitute a larger position for a missing calculation.
Reflect and self-check
Does understanding this lesson guarantee profit?
No. Understanding mechanisms helps evaluate decisions; it cannot predict market movements or remove trading losses.
Can I use this lesson with any broker?
The principles may transfer, but prices, product rules, contract multipliers, protections and country eligibility must be checked for each provider.