How to Trade a Credit Spread
To trade a credit spread, sell an option and buy a further-out one in the same expiry, collecting the net credit. Your maximum loss is the difference between the strikes minus that credit, and it is typically several times larger than the amount received.
A credit spread sells one option and buys a further one in the same expiry as protection. You receive the difference. The structure caps the loss, and the capped amount is normally several times what you received.
Before you start
The maximum loss calculated before the order is placed, because it is fixed and knowable. Strike width, times the contract multiplier, minus the credit. There is no reason to place one without this figure.
A directional view expressed as a level price will not exceed. Credit spreads are not neutral. You are stating that price stays on one side of a strike.
Both legs in the same expiry, at strikes that are actually liquid. An illiquid protective leg makes the position hard to close as a unit.
The steps
1. State the level price should not exceed
The short strike is the statement. Everything else in the structure is a consequence of where you put it, so it deserves the same care as any entry level.
2. Choose the width from the loss you accept
A wider gap between the strikes pays more credit and risks more. Narrower pays less and risks less. This is the only lever, and it is a straightforward trade.
3. Calculate the maximum loss in currency
Width times multiplier, minus credit received. A five-wide spread collecting 40 risks 460. That comparison is the trade and it should be visible before the order goes in.
4. Size from the loss, not from the credit
Your risk per trade divided by the maximum loss gives the number of spreads. Sizing from the credit produces a position several times larger than intended.
5. Check both strikes trade
The protective leg is the one people skip checking. If it is illiquid, closing the spread early means closing one leg and being left holding a naked short option.
6. Place and close it as a single order
Legging in or out exposes you to whatever happens between the two fills, and in the case of exiting, to holding an unprotected short position.
7. Close it before expiry week
Most of the credit is captured well before expiry. Holding through the final days keeps full assignment risk in exchange for the last small portion of the payment.
How to tell it worked
The maximum loss was written down in currency before the order, next to the credit.
Position size came from that loss figure, so 1 loss equals your intended risk per trade.
Both legs traded on at least 1 of the last 5 days.
And the position was closed at least 5 days before expiry, not held into the final week.
The ratio that defines it
You will be right most of the time and the losses will be several times the wins. That is arithmetic rather than pessimism, and a strategy can work perfectly well on those terms provided the sizing accounts for it.
Costs are charged on four legs. Two opening, two closing. On liquid contracts that is manageable and on quiet ones it is a large share of the credit.
Why the win rate is misleading
A structure that wins most of the time produces long uninterrupted runs. On this site’s shared series 54% of 566 ten-bar windows finished higher, and a spread placed well away from price wins far more often than that base rate.
The run is the design. It is not evidence that the strikes were well chosen or that the sizing is right, and it arrives whether or not either is true.
Which means the review has to be on total currency, not on the count. Nine wins of 40 and one loss of 460 is a negative month at a win rate of 90%, and it looks like a successful one on every summary that counts trades.
Where to put the short strike
Start from structure, exactly as you would for any entry. A level price has failed to exceed several times is a reason. A strike that pays a round number of credit is not.
Then check the distance against ordinary movement. On this site’s shared series the ninetieth percentile bar range is 1.101 and the largest single bar measured 2.338. A short strike inside a couple of ordinary bars is being tested by noise rather than by a change in direction.
The further out the strike, the less credit and the higher the proportion of winners. Both move together, and neither on its own tells you whether the position is worth having.
The comparison that matters is credit against distance. Being paid a little to stand a long way back is a different proposition from being paid a little to stand close, and only the second one is obviously bad.
The original data
Of the 24,971 unique videos in research/search-study-corpus.jsonl, 8 mention credit spreads in the
title, at a median of 14,227 views across 7 channels, and 50% of those titles are instruction-shaped.
Iron condors appear in 5 at 5,660, and options generally in 889 at 10,399. The counts come from
site/corpus_count.py.
8 videos at 14,227 across 7 channels. Thin coverage for a structure that is heavily promoted, and almost all of it leads with the proportion of winning trades rather than with the ratio between the credit and the capped loss.
The answer to the question on that chart is that a wider spread increases the maximum loss. More credit and more risk are the same lever pulled once. The run of winners is what the structure produces and says nothing about whether the next one is affordable.
When it fails
The failure is sizing from the credit, and it is invisible for months. Receiving 40 feels like a 40-unit trade, so the position gets scaled to make the credit meaningful — which scales the 460 with it. Fourteen expiries pass uneventfully and the approach looks validated. The fifteenth reaches the short strike, all of the capped losses arrive at once, and the total is larger than everything collected before it.
The second failure is an illiquid protective leg. Exiting leaves a naked short.
A third is legging in or out. The gap between fills is uncontrolled.
A fourth is holding into expiry week. Full assignment risk, minimal remaining credit.
A fifth is judging it on win rate. The count and the currency disagree here by design.
And a sixth is widening for more credit. That is increasing the loss, described differently.
Related
Credit spread covers the structure itself. Vertical spread is the general form, including the debit version. And options expiry is the deadline that shapes the exit decision.
The number I write on every one of these before placing it is the maximum loss, in currency, next to the credit. Seeing ‘receive 40, risk 160’ in the same line is the only thing that keeps the position sized honestly. Reading only the credit makes it look like a small trade, and it is not a small trade.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.