Cash-secured put losses: maximum loss vs stress scenarios
A short put's maximum loss is known but can be large. Use it alongside stress losses rather than discarding either measure.
By OptionsKing. Publisher and editorial methods.
What you will learn
By the end of this lesson, you should be able to:
- Calculate the put's maximum loss.
- Measure losses at several stock prices.
- Track the loss through assignment.
Calculate the contractual extreme first, then examine less severe stock outcomes. The AMD ladder shows how losses change across prices. A stress scenario is a planning assumption; bankruptcy and deeper gaps remain possible even when the selected scenario appears affordable.
The position
Cycle 3 of the running book. AMD at $126, short the $113 put, 46 days, 46 percent implied volatility, sold for $2.78.
- Cash secured: $11,300. That is $113 times 100, parked for the whole life of the trade.
- Break-even: $110.22. The strike less the credit.
- Maximum loss: $11,022, if AMD goes to zero.
- Maximum gain: $278, if it stays above $113.
The asymmetry is the trade. You are risking $11,022 to make $278, and you win about three times in four. Anyone who describes that as conservative is describing the win rate and ignoring the ratio.
Use maximum loss as a real constraint
The $11,022 maximum is reached at a zero stock price. It is a severe endpoint, but a low estimated probability does not remove it from the obligation you accepted.
A 2 percent maximum-loss budget on a $50,000 account is $1,000, so this AMD contract does not fit. That is a valid reason to skip it, choose a smaller funded obligation, or study a different structure with its own risks. Position sizing should implement your loss limits, not redefine them to permit a desired trade.
Add stress scenarios without replacing the maximum
One standard deviation over 46 days at 46 percent implied volatility is 16.3 percent. Here is what each multiple of it costs.
| Move | Stock at expiry | Loss after the credit | Share of a $50,000 account |
|---|---|---|---|
| 1 sigma down | $107.02 | $320 | 0.6% |
| 2 sigma down | $90.89 | $1,933 | 3.9% |
| 3 sigma down | $77.20 | $3,302 | 6.6% |
| what happened: 1.67 sigma | $96.00 | $1,422 | 2.8% |
| to zero | $0.00 | $11,022 | 22.0% |
The three-sigma row loses $3,302, approximately 30 percent of the maximum loss. It describes one adverse price, not a worst-case boundary. A jump or a heavier-tailed return distribution can produce a larger loss than a normal-model scenario suggests.
The worked ledger's $96 finish produces a $1,422 loss after credit. Use it to calculate the effect on account equity, but do not infer a reliable event frequency from the sigma label. Joint losses, changing volatility and reduced exit liquidity also belong in the stress plan.
Two more numbers worth knowing
The odds of touching the break-even: 42.9 percent. Nearly half the time this trade dips below $110.22 at some point, whatever it does by expiry. That is the number that predicts how the position feels, and it is roughly double the odds of actually finishing there.
The whole book's maximum loss: $26,254, which is 52.5 percent of the account. Six cash-secured puts on ordinary large companies, and the theoretical worst case is half the money. Nobody who sells six puts thinks of themselves as risking half the account, and technically they are.
Where the loss actually arrives
Assignment changes the form of the exposure, not the existence of the economic loss. Shares acquired above market value leave the account poorer even before a sale. A later recovery can reverse that loss but was not knowable when the assignment decision was made.
Not as a debit. As stock.
At the illustrative $96 expiration price, assignment uses $11,300 to acquire 100 shares worth $9,600. The $1,700 stock-price shortfall less the $278 credit is the $1,422 economic loss. Tax recognition and stock basis follow separate rules; an unrealized tax loss is still a real reduction in wealth.
The ledger later contains a recovery. That later result does not prove that keeping the shares was correct at assignment or that closing would have been a mistake. Judge the decision using the information and limits available then, including the possibility of a further decline.
Check your understanding
Does delaying the sale of assigned shares mean the loss is not yet economic?
Show the explanation
No. The account already owns shares worth less than its net acquisition cost. Realization affects accounting and tax timing; it does not remove the current shortfall.
Common questions
What is the maximum loss on a cash-secured put?
The strike times 100 less the premium, reached only if the stock goes to zero. On a $113 put sold for $2.78 that is $11,022 against a maximum gain of $278.
What loss should I actually plan for on a short put?
Plan for several adverse scenarios, including gaps beyond a normal-model 2- or 3-sigma range, and check maximum loss and concentration. The lesson's sigma calculations illustrate assumptions, not a reliable worst-case boundary.
How much of my account is at risk if I sell six cash-secured puts?
Theoretically all of the collateral. Six ordinary puts in the worked book carried a combined maximum loss of $26,254 on a $50,000 account, which is 52.5 percent. A simultaneous 25 percent decline in all six, by contrast, cost $4,136.
Do I lose money the moment a put is assigned?
Assignment changes the position from option plus cash to shares. An economic loss may already exist even if the stock loss is not realized for tax purposes. Recognition timing does not make that loss disappear.
Sources
Rules and thresholds above were checked against these documents on August 4, 2026. Exchange and broker rules change. Confirm anything you are about to act on with your own broker.
Keep reading
Do the math on your own trade
Every price in this article is an illustrative worked example, not a quote. Read Running the book for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.