An 80% binary options payout does not mean an 80% chance of winning. It means a winning trade earns 80% of the amount staked, assuming the percentage describes profit rather than the total returned. If a losing trade costs the full stake, the break-even win rate is approximately 55.56% before fees. Winning more often than losing can still leave you out of pocket.
For UK readers, this is an explanation of payout mathematics, not a recommendation to trade. The FCA prohibition on selling, marketing and distributing binary options to retail clients in or from the UK took effect on 2 April 2019 and remains in the FCA Handbook’s retail binary options rules.
What a Binary Options Payout Actually Pays
Start by separating the stake, the profit and the total amount returned. They are different numbers, even if an advertisement uses “payout” for more than one of them.
Suppose a hypothetical contract accepts a £100 stake and offers an 80% profit on a winning outcome. A win produces £80 profit and returns the original £100, making the total credited £180. A loss returns nothing, leaving a £100 loss.
The £180 is not profit. Counting the returned stake as earnings makes the result look considerably better than it is. The same distinction applies at smaller stakes: an £8 profit on £10 means £18 comes back, not £18 has been earned.
Read the settlement terms before interpreting any percentage. Check whether the displayed amount includes the original stake, what happens on a losing outcome and whether charges apply. The mechanics of expiry, strike prices and settlement conditions are covered separately in how binary options work.
A payout percentage is also not an annual return or an expected account return. It describes one possible result on one contract. It says nothing by itself about how often that result will occur.
How to Calculate the Break-Even Win Rate
The general calculation compares the money earned on a win with the money lost on a loss:
Break-even win rate = loss per losing trade ÷ (profit per winning trade + loss per losing trade)
Both amounts must use the same currency and exclude any returned stake from the winning profit. The formula assumes those amounts stay constant across trades and there are no additional outcomes or charges.
For an £80 profit against a possible £100 loss:
£100 ÷ (£80 + £100) = 0.5556, or approximately 55.56%
When a loss costs the full stake, the shorter version is 1 ÷ (1 + payout rate), with the payout rate expressed as a decimal. Enter 0.80 for an 80% profit payout, not 80.
The reason is straightforward. At break-even, profits from winning trades must exactly cover losses from unsuccessful trades. Advertised returns can obscure this imbalance when a losing trade costs more than a winning trade earns (SEC investor warning on binary options returns).
| Profit payout on a win | Profit on a £10 winning stake | Break-even win rate |
|---|---|---|
| 50% | £5.00 | 66.67% |
| 60% | £6.00 | 62.50% |
| 70% | £7.00 | 58.82% |
| 75% | £7.50 | 57.14% |
| 80% | £8.00 | 55.56% |
| 85% | £8.50 | 54.05% |
| 90% | £9.00 | 52.63% |
| 95% | £9.50 | 51.28% |
| 100% | £10.00 | 50.00% |
These figures are calculated thresholds, rounded to two decimal places. They are not observed success rates or evidence that any strategy can achieve them. Profit requires a win rate above the exact threshold under the stated assumptions.
Why a 55% Win Rate Can Still Lose Money
Consider 100 hypothetical trades, each staking £10 at an 80% profit payout. Every win earns £8 and every loss costs £10.
With 55 wins and 45 losses, winning trades earn £440, while losing trades cost £450. The result is a £10 loss, despite being correct more often than wrong.
With 56 wins and 44 losses, profits total £448 and losses total £440, leaving £8 before charges. With 60 wins and 40 losses, the result improves to £80 profit.
This also shows why “about 55%” is not an adequate substitute for the break-even calculation. One extra win replacing a loss changes the result by £18: the £8 earned plus the £10 no longer lost.
Expected value puts both outcomes together
Expected value is the probability-weighted average result, not a forecast for the next trade:
Expected profit = (win probability × winning profit) − (loss probability × losing amount)
Assuming a genuine 50% win probability in the £10 example, the calculation is (0.50 × £8) − (0.50 × £10), or −£1 per trade. That is a negative expected return of 10% of the stake.
The 50% probability here is an assumption. Two possible outcomes do not automatically make them equally likely. Nor does a recent 60% winning record establish that the next trade has a 60% chance of success.
When the Standard Payout Formula Needs Adjusting
The table applies only to the stated model. Refunds, charges and different quoting conventions change the amounts that belong in the calculation.
Fees raise the required win rate
Suppose every £10 trade carries a separate 20p charge, whether it wins or loses. At an 80% payout, the net winning profit becomes £7.80 and the net losing amount becomes £10.20.
The revised threshold is £10.20 ÷ (£7.80 + £10.20), or 56.67%. A seemingly small charge has moved the required win rate by more than one percentage point.
Include costs once, not twice. If winning and losing figures already include transaction charges, do not subtract those charges again. Account or withdrawal costs must also be deducted when assessing the final cash result, even if they are not charged per trade.
Partial refunds reduce the losing amount
If a hypothetical contract genuinely returns 10% of the stake after a loss, a £10 losing trade costs £9 rather than £10. Keeping the £8 winning profit, break-even becomes £9 ÷ (£8 + £9), or approximately 52.94%.
This calculation assumes the refund is unconditional cash. A promotional credit that cannot be withdrawn is not equivalent to money returned. If a refund comes with a lower winning payout, both sides of the formula need changing.
Refunded ties are neither wins nor losses
If the contract terms provide a full, fee-free refund for a tied result, record it separately. For the standard break-even comparison, calculate the win rate as wins divided by wins plus losses, excluding those neutral outcomes.
Do not assume every contract treats an exact match at expiry this way. If a tie counts as a loss, it belongs among the losses. If a charge remains payable on a refunded trade, that outcome is not financially neutral.
A quoted contract price is not a profit percentage
A hypothetical contract purchased for £60 that settles at either £100 or zero has a £40 winning profit and a £60 possible loss. Its break-even probability is £60 ÷ (£40 + £60), or 60% before charges.
The £100 settlement value does not mean a 100% profit payout. Work from the purchase cost and the cash received rather than applying a percentage table to the wrong kind of quote.
Changing Payouts and Stakes Make Headline Win Rates Misleading
A win rate cannot be judged without its associated payouts. Across 100 equal £10 stakes, 60 wins at a 60% profit payout earn £360 against £400 of losses: a £40 deficit. The same 60 wins at a 90% payout earn £540 against £400 of losses: a £140 profit.
When payouts vary, calculate each trade’s actual result. For a historical record, the total is the sum of winning profits minus losing amounts and any costs not already included. A simple average of all quoted payouts can mislead if winning trades received different payouts from losing trades.
Changing stake sizes creates another problem. Six £10 wins at an 80% payout earn £48. Four £20 losses cost £80. That record has a 60% win rate but loses £32.
Any strategy testing and validation process should therefore retain the stake, offered payout, settlement outcome and net cash result for every trade. A win-rate screenshot cannot replace that record.
A Profitable Sample Is Not Proof of a Reliable Edge
Even a complete record contains uncertainty. Suppose a hypothetical strategy wins 60 of 100 trades. Its observed win rate is 60%, but that does not establish a stable underlying success probability of exactly 60%.
Using the NIST Wilson confidence interval method, that example produces an approximate 95% interval of 50.2% to 69.1%, assuming independent trials with a constant success probability. The interval includes values below the 55.56% break-even threshold for an 80% payout.
This is a calculated illustration, not a study of actual binary options traders. It shows why 60 wins in 100 trades would not, on its own, establish that the underlying win probability exceeds the required threshold at that confidence level.
The assumptions matter too. If several trades depend on the same price move, treating them as independent observations can overstate the evidence. If the rules were repeatedly changed until the historical results looked profitable, that same record is not an independent test of the final rules.
Keep research results separate from later observations made under unchanged rules. Do not treat a break-even calculation as proof that the win probability used in it is achievable.
Doubling Stakes Does Not Repair an Unfavourable Payout
A staking progression changes the amount exposed, not the contract’s payout ratio. It cannot turn a negative expected return per pound into a positive one simply by increasing the next stake.
The arithmetic is especially unforgiving below a 100% profit payout. Consider stakes of £10, £20, £40 and £80 at an 80% payout. If the first three trades lose and the fourth wins, the losses total £70 while the final winning profit is £64. The sequence still loses £6.
If all four lose, the loss reaches £150. Doubling has enlarged the exposure without guaranteeing recovery. This is where payout calculations meet loss-chasing and the decision to stop: increasing the stake does not supply evidence that the next outcome will be better.
A Calculated Payout Is Not the Same as Withdrawable Money
Every example above assumes the contract settles honestly, the stated terms are honoured and money credited can actually be withdrawn. Without those conditions, a precise break-even calculation offers little protection.
Fraud complaints have included refused withdrawals, hidden charges and manipulated historical charts. Deposit bonuses can also carry trading requirements that restrict withdrawals (CFTC warning on off-exchange binary options practices).
Keep two questions separate: does the payout mathematics support the claimed profitability, and is the displayed balance real money that can be recovered? A mathematically plausible claim does not answer the second question. Requests for further deposits to release supposed earnings require scrutiny, not another round of trading.
The practical test is to identify the genuine winning profit, the full losing amount, all charges and the evidence behind any claimed win rate. For withdrawal restrictions and demands for further payments, use the separate guide to binary options scams and withdrawal traps. Better arithmetic can expose a misleading offer; it cannot make an unsafe offer safe.