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Do I need the cash to sell a put?
In a cash account, yes. Your broker sets aside the strike price times 100 for every put you sell. A margin account lets you sell the same put with less cash, but the promise to buy the shares is the same size.
The short answer
Yes, if you're doing it the way we'd suggest. A cash-secured put means your broker locks up the strike times 100 the moment you sell. Sell one $45 put, and $4,500 sits frozen until the put expires, is closed, or is assigned.
A margin account lets you sell that same put with a fraction of the cash. The broker lends the rest if you're assigned. That sounds like a feature. It's the fastest way we know for a beginner to end up owning more stock than they can pay for.
If "put" and "strike" are new words, read options trading basics first.
What the cash is for
When you sell a Put option, you promise to buy 100 shares at the Strike price if the buyer asks. The cash is the money to keep that promise. It isn't a fee. It isn't lost. It just can't be used for anything else while the put is open.
If the put expires worthless, the cash unlocks and you keep the premium. If you're assigned, the cash becomes 100 shares. Either way, you were always able to pay.
Cash-secured vs margin, side by side
| Cash-secured put | Put sold on margin | |
|---|---|---|
| Cash set aside for a $45 put | $4,500 | A fraction of that, set by the broker's own formula |
| Who pays if you're assigned | You, from the set-aside cash | You, plus a loan from the broker |
| Interest charged | None | Yes, on the borrowed part, once assigned |
| Margin call possible | No | Yes, if the stock keeps falling |
| Account type needed | Cash or margin | Margin only, higher approval |
| How many puts the same cash allows | One | Several |
That last row is the trap. The same $4,500 that covers one put in a cash account can "cover" four or five on margin. Then the market drops and all of them get assigned at once. See cash-secured vs margin-secured puts for the longer version.
A worked example (an illustration, not a trade idea)
XYZ trades at $50. You sell one 30-day $45 put for $1.00 and collect $100. In a cash account, $4,500 is set aside.
| XYZ at expiry | What happens | Shares | Premium | Total |
|---|---|---|---|---|
| $55 | Put expires; cash unlocks | — | +$100 | +$100 |
| $45 | Put expires or you're assigned at $45 | $0 | +$100 | +$100 |
| $42 | Assigned at $45; worth $42 | −$300 | +$100 | −$200 |
| $35 | Assigned at $45; worth $35 | −$1,000 | +$100 | −$900 |
| $0 | Assigned; shares worthless | −$4,500 | +$100 | −$4,400 |
Now the same put sold on margin with only $1,000 of your own cash. At $35 you still owe $4,500 for the shares. The broker lends $3,500, charges interest on it, and if XYZ keeps sliding you'll get a margin call. The loss is the same $900. The difference is you may be forced to sell at the bottom to raise cash.
The cash-secured seller at $35 owns a stock that's down and can wait. The margin seller at $35 owns the same stock, owes interest on it, and may not get to wait.
Why cash first, even if you have margin
The premium feels like the whole trade. It isn't. The put is a promise to buy $4,500 of stock, and the premium is $100. Sizing by the premium is how people sell five puts on an account that can afford one.
Cash-secured forces the right size. You can only sell what you could pay for. That one rule removes most of the horror stories about the wheel strategy.
Canada note: covered calls are widely allowed in a TFSA or RRSP, but cash-secured puts depend on the broker, and margin isn't allowed in registered accounts at all. Options permissions differ by broker everywhere, so ask yours.
What if I don't have $4,500?
Then that put is too big for you. A lower-priced stock means a smaller strike and less cash set aside, but also a thinner list of stocks worth owning. See can I sell options with $500? for an honest look at the floor.
What not to do is use margin to make a put "fit". The put didn't get smaller. Only your cushion did.
Questions
Does the cash leave my account when I sell a put?
No. It stays in your account but is frozen as collateral. You can't spend or trade with it until the put is closed, expires, or is assigned.
Do I earn interest on the set-aside cash?
Some brokers pay interest on idle cash, including cash held as collateral, and some don't. Check with yours.
Can I sell a cash-secured put in a cash account?
Usually yes, at a basic options approval level. That's the point of "cash-secured": no borrowing is involved. Rules differ by broker.
What's the difference between a cash-secured put and a naked put?
Same contract, different collateral. Cash-secured sets aside the full strike times 100. A naked put is sold on margin with a fraction of that, so assignment can mean a loan and a margin call.
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