Credit Spreads: A High Win Rate and a Small Win
A credit spread is selling one option and buying a further one of the same type, keeping the net premium. The long leg converts an open-ended risk into a known maximum loss, and that maximum is the width between the strikes minus the credit received.
How it works
Sell an option, buy a cheaper one further away, and keep the difference. Both legs are the same type — two puts or two calls — with the same expiry and different strikes.
The money arrives at the start. That is what “credit” means, and it is the maximum the position can make. Everything from there is about keeping it.
The bought leg is doing one job: capping the loss. Selling a put on its own has a very large downside. Buying a lower one converts that into a fixed maximum, and the cost of it is part of why the credit is smaller than the sold premium alone.
The numbers
Short put at 100, long put at 90, credit received 3:
| Maximum gain | +3 — the credit, kept if both expire worthless |
| Maximum loss | −7 — the 10-point width minus the 3 credit |
| Breakeven | 97 — the short strike minus the credit |
| Above 100 | full profit |
| At or below 90 | full loss |
Read the two figures against each other, because that ratio is the whole strategy. A full loss is −7 and a full win is +3. One loss removes more than two wins.
Which means a high win rate is the requirement, not the result. At 3 to win and 7 to lose, the position needs to win roughly 70% of the time simply to break even before costs. Winning 75% of the time is not evidence of an edge — it is barely clearing the arithmetic.
That single ratio explains almost every disappointed credit-spread account. The wins are frequent and small, the losses are rare and large, and the two are designed to roughly cancel.
In practice: what the position wants
Time is the engine. The position profits by nothing happening, and theta is what converts days into money for a seller.
And it is earned unevenly. Half the days gone leaves 70% of the extrinsic value, so most of the credit is earned in the second half — which is also when the risk is highest.
Gamma rises at the same time. The last week offers the smallest remaining credit and the fastest deterioration, which is a poor exchange and the reason many people close early.
What a credit spread is not
It is not a high-probability trade in any useful sense. The probability is high because the payoff is bad, and the two are set against each other by the pricing.
It is not income. The credit is payment for a risk that has not resolved yet, and calling it income before expiry counts money that may still be owed.
It is not defined-risk in every situation. The maximum loss assumes both legs behave; one leg assigned early leaves an uncovered position until it is dealt with.
And it is not a substitute for a view. The strategy needs price to stay away from the short strike, which is a directional opinion whether or not it is stated as one.
When it fails
One full-width loss removes more than two full wins. That is the arithmetic above stated as an outcome, and it arrives eventually because the moves that cause it are exactly the ones the pricing anticipates.
Costs bite harder than they look. Two legs to open and two to close is four option spreads against a maximum gain of 3, on top of the 2% of a typical bar the underlying costs to trade.
Widening the strikes is the second failure. A wider spread collects more credit and raises the maximum loss proportionally, so the ratio barely improves while the size of the bad outcome grows.
Rolling a losing spread is the third. Moving it further out collects more credit and extends the exposure, converting a defined loss into a larger position with a later deadline.
And selling into elevated volatility without asking why is the fourth. The credit is generous because something uncertain is expected, and the seller is being paid for a real risk rather than finding a mispricing.
A fifth is running many of them at once on correlated instruments. Ten spreads across ten different names feels diversified and behaves like one position on a bad day, because the thing that breaches one short strike tends to breach the others at the same time.
A sixth is measuring performance over too short a window. A run of twenty wins is what this structure produces even when it has no edge at all, so a quarter of good results says nothing. The interval that contains information is the one that includes at least one full loss.
None of that makes credit spreads a bad structure. They have a defined maximum loss, they profit from the most common market condition, and they remove the open-ended risk of a bare short option. What they do not do is offer a favourable payoff, and the win rate people quote is the compensation for that rather than evidence against it.
The original data
11 of the 24,971 videos measured for this site cover credit spreads, at a median of 12,476 views — a moderate supply, and one where the win rate is quoted far more often than the payoff ratio that makes the win rate necessary.
The +3 against −7 was computed from the stated contract — 10-wide strikes, 3 credit — and the breakeven at 97 follows from it. Any real spread can be worked the same way before it is opened, and the ratio it produces is the honest description of the trade that no win rate can replace.
Related
Debit spreads are the mirror: pay up front, cap the gain, and the ratio flips. The iron condor is two of these at once. And theta is the mechanism the whole position depends on.
Credit spreads taught me to stop quoting win rates. Mine was genuinely high and the account was flat, because the arithmetic on this page says a high win rate is the entry requirement rather than the achievement.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.