Cash-secured put vs naked put: the same promise, a different danger
Both are the same short put. One is backed by the full cash to buy the shares. The other is backed by a margin deposit that is only a fraction of that. The option is identical; the danger is not.
The short answer
A cash-secured put is a short Put option with the full purchase price of 100 shares set aside in cash. If you're assigned, the cash is already there.
A naked put is the same short put, but your broker only holds a margin deposit against it, often a fraction of the strike. You can sell more contracts with the same money.
The max loss per contract is the same. The naked version just lets you take on more of it than your account can carry.
Side by side
| Cash-secured put | Naked put | |
|---|---|---|
| The option | Short put | Short put |
| What backs it | Strike × 100 in cash | A margin requirement, set by the broker |
| Account type | Cash or margin | Margin only |
| Approval level | Usually a lower level | Usually the top level |
| If assigned | Cash pays for the shares | You may have to borrow, or sell shares at once |
| Margin call possible | No | Yes, as the stock falls |
| Max loss per contract | Strike − premium | Strike − premium |
| Contracts per $5,000 | About one, on a $45 strike | Several, depending on the requirement |
What "naked" really means
The put is not naked in the sense of being uncovered by rules. Your broker still demands something. It sets a Margin requirement, a number it works out from the stock price, the strike and the premium. It changes every day. When the stock falls, the requirement rises.
That's the trap. The requirement is small on the day you sell, when the stock is calm. It gets big on the day the stock drops, which is the day you least want to find more money.
A worked example (an illustration, not a trade idea)
Two traders each have $5,000. A made-up stock, XYZ, trades at $50. Both sell the 30-day $45 put for $1.00.
- The cash-secured trader sells one contract. $4,500 is set aside. $100 collected.
- The naked trader's broker asks for about $900 per contract. They sell five. $500 collected.
Then XYZ reports bad news and falls to $30.
| Outcome at expiry | Cash-secured, 1 contract | Naked, 5 contracts |
|---|---|---|
| Assigned at $45 | Buy 100 shares for $4,500 | Must buy 500 shares for $22,500 |
| Shares now worth | $3,000 | $15,000 |
| Loss on shares | −$1,500 | −$7,500 |
| Premium kept | +$100 | +$500 |
| Net | −$1,400 | −$7,000 |
| Account after | $3,600, holding 100 shares | A $7,000 loss on a $5,000 account |
The naked trader doesn't even get to expiry. As XYZ falls through $40, the margin requirement on five puts climbs past what's in the account. The broker issues a margin call. If the trader can't add cash, the broker buys the puts back at whatever they cost that day. The loss is locked in and the account is empty, or worse.
Same option, same stock, same move. One trader is down $1,400 and owns a stock they said they'd buy. The other is wiped out. Nothing about the put changed. Only the backing did.
Why the cash-secured version is the one in the wheel
The wheel strategy starts with a cash-secured put because Assignment is the plan, not the accident. You want to own the shares at the strike. The cash is sitting there for that reason.
A naked put treats assignment as a thing to avoid. The premium looks like the whole point. That mindset is what leads to five contracts instead of one.
When a naked put can make sense
Some experienced sellers use margin-backed puts and size them as if they were cash-secured. They sell one contract, keep the cash free, and treat the extra buying power as a buffer, never as room for more trades. Used that way the two are close to the same thing.
The trouble is the temptation. Buying power that sits unused is hard to leave alone. If you're new to selling puts, the cash-secured version takes that choice away from you. Our cash-secured put guide shows every outcome.
In Canada, registered accounts (TFSA, RRSP) don't allow margin, so naked puts are off the table there, and cash-secured puts depend on the broker.
What to do with this
- Decide the size by the shares, not the premium. "Would I buy 100 shares at $45 today?" If yes, that's one contract.
- If your broker shows "buying power" that's larger than your cash, write down your own cap and stick to it.
- Before any put, work out the loss if the stock falls 40%. If that number would end your account, the trade is too big, naked or not.
Questions
Is a naked put riskier than a cash-secured put?
Per contract, no. Both can lose the strike minus the premium. The naked put is riskier in practice because margin lets you sell more contracts than you could pay for, and a margin call can force you out at the worst time.
Do I need a margin account to sell naked puts?
Yes, plus the highest options approval level at most brokers. Cash-secured puts are usually allowed in a cash account at a lower level. Rules differ by broker, so check yours.
What happens if I'm assigned on a naked put and don't have the cash?
You buy the shares on margin, which means borrowing from the broker at interest. If the position is too large, the broker can sell the shares, or other holdings, to cover it.
Can I sell a cash-secured put in a margin account?
Yes. A margin account doesn't force you to use margin. Set aside the full strike amount yourself and size as if the margin weren't there.
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