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Cash account or margin account for selling options?

A cash account makes you pay for every obligation in full. A margin account lets you back the same obligation with a fraction of it. One of those is a limit. The other is a loan. Here's what that difference does to a losing trade.

Options guide · 7-minute read · Updated 2026-10-26

The short answer

In a cash account, you can sell covered calls and cash-secured puts, and the broker holds the full cash for every put. In a margin account, you can sell the same trades, but the broker may only hold a fraction of the put's value, and it lends you the rest if you're assigned.

Beginners start in cash because the account won't let them over-commit. The wheel strategy doesn't need margin at all. Margin's only gift to an option seller is the ability to sell more than they can pay for, and that is exactly the thing that ends accounts.

What each account allows

The two accounts also differ in how the broker's Options approval levels work. Cash accounts usually top out at the level that includes cash-secured puts. That's all the wheel needs.

Settlement: the thing that catches cash-account users

When you sell shares or close an option, the cash shows up as "unsettled" for a short time, often the next business day. Rules change, so check the current settlement period with your broker.

In a cash account, spending unsettled cash and then selling what you bought before it settles can earn you a "good faith violation". A few of those and the broker restricts the account for a while. For an option seller the practical rule is simple: after you're assigned or called away, wait for the cash to settle before you open the next position. A margin account papers over this, because the broker lends for the gap. That convenience is real, and it's also how people stop noticing they're borrowing.

How a put is backed in each account

Say you sell one put at the $45 strike. The obligation is $4,500.

• Cash account: the broker holds $4,500. You can't touch it until the put is gone.
• Margin account: the broker holds a margin requirement, often much less than $4,500. The exact amount depends on the broker, the stock and the strike, and it can go up without notice. The rest of your cash stays free, which makes it very easy to sell a second put, a third, a fourth.

That's the whole difference. Read the cash-secured put guide for the trade itself; this page is about what the account does to your sizing.

A worked example where margin turns one loss into four (an illustration, not a trade idea)

Two people each have $10,000. Both sell 30-day puts at the $45 strike on a made-up stock, XYZ, at $50, for $1.00 each.

In the cash account, the broker holds $4,500 per put, so one contract is all that fits. Premium collected: $100.

In the margin account, the broker holds, say, about a fifth of the strike value per put (brokers differ; this is a round number). Four puts fit easily. Premium collected: $400. On the screen it looks like four times the result for the same stock.

XYZ then falls to $25 and stays there through expiry.

The margin account didn't just lose four times as much. With $10,000 of stock and a $7,600 loan, its equity is $2,400. A margin call is likely at that point, and if the person can't add cash, the broker sells shares at $25 to shrink the loan. That turns a paper loss into a locked-in one, at the low. Interest on the $7,600 runs the whole time.

The cash-account person is down $1,900 and owns 100 shares of a stock they said they'd buy at $45. They can sell a call on them, or wait, or sell. Nobody is forcing anything.

When a margin account makes sense for a seller

• You want the settlement convenience and you still size every put by the full strike value, as if the account were cash. Many experienced sellers do exactly this.
• You've closed a few dozen cycles and you understand what a raised margin requirement looks like on a bad day.
• You've read keeping cash aside for assignment and keep a written number for what you owe if everything is assigned at once.

If any of those isn't true yet, a cash account is the better tool. It's not a beginner's badge. It's a limit you'd want to impose on yourself anyway.

What to actually do

1. If you're opening your first options account, choose cash and apply for the level that includes cash-secured puts.
2. If you already have margin, write the full strike value of every open put on one line and compare it with your cash. If the first number is bigger, you're using margin whether you meant to or not.
3. Size by the obligation, never the premium. Position sizing when you sell options gives the method.

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